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Changelog

v1.7.4​

Release date: 6 November 2025

Fixed
  • PSS®E Dynamic: Fixed SCALE_LOADS Command incorrectly ignoring SUBSYSTEM= argument (and therefore applying the scale to all loads in the given PSS®E case regardless of the specified subsystem). Replaced SUBSYSTEM= Argument with AREA= Argument (which creates a subsystem definition dynamically) to better align with typical use cases (e.g. NER S5.2.5.7 partial load rejection tests within a given network area).

v1.7.3​

Release date: 27 October 2025

Fixed
  • Engine: Fixed error at end of gridmo Engine setup wizard when manual PSS®E setup method was used.
  • Engine: gridmo Engine setup wizard 'Click to send email' button no longer renders on-top of the Engine ID text field.
  • Engine: gridmo Engine setup wizard no longer displaying popup saying "INVALID_PATH" as invalid when setting up a new gridmo Engine (applies to both Inputs folder and Outputs folder pages).
  • PSCAD™: Fixed index error if a PSCAD™ workspace has multiple case files and there are no valid sim sets OR no sim sets which reference any case file in the workspace.
  • PSCAD™: Removed 'force kill' warning when closing PSCAD™ software package (was incorrectly marked as warning).
  • PSS®E Dynamic: When using "Merge into network" mode, the gridmo Engine was copying the specified .dll files into the correct location but not importing them into PSS®E.
  • PSS®E Static and PowerFactory Static: CONTROL_P, CONTROL_Q, CONTROL_PF and CONTROL_VDROOP no longer reports a generator as not converged with zero error if the generator is offline (is now correctly ignored).
  • Plot: Attempted fix to prevent "Unknown opcode" error when generating PDF Outputs from Plot Node.
  • Plot: Fixed SETTLING_TIME and RISE_TIME Commands from raising an error if both START_T= and END_T= are outside of the channel's time range.
  • Plot: PowerFactory Dynamic channels now no longer display as "Unknown" when used with error bands, and exporting the percentage of data points within the error bands was enabled.

v1.7.2​

Release date: 15 October 2025

Fixed
  • Plot: Fixed error in Plot merge task if an image (PNG) or raw Excel (XLSX) data output was selected.

v1.7.1 & 1.6.2​

Release date: 14 October 2025

Fixed
  • Engine: Fixed error in Engine setup wizard which could rarely cause invalid folder paths from being set.

v1.7.0​

Release date: 14 October 2025

New
  • Engine: Added new dedicated pages to explain common Engine warnings and errors.
  • PSCAD™: PSCAD™ simulations can now complete without the smiby block present (this is to support wide-area PSCAD™ models).
  • PSS®E Dynamic, PowerFactory Dynamic and PSCAD™: Math operations now supported in simulation time field.
  • PSS®E Dynamic: Added OUPTUT, GEN=, VAL=SPEED_ABS to output the absolute speed (rather than speed deviation from nominal) as an output channel.
  • PSS®E Static and PSS®E Dynamic: Released new PSS®E macro recording capability - now captures all communication between the gridmo Engine and PSS®E, including functions which are not captured by PSS®E's internal recording capability. Standalone folder Python files are now exactly what gridmo ran (rather than PSS®E's recording of it).
  • PSS®E Static and PowerFactory Static: Added SET, LINE=, R=, X=, B= to set line impedance (in ohms).
  • PSS®E Static and PowerFactory Static: New CONTROL-style Commands added which support advanced power-plant controller style logic (unequal sharing ratios and dispatch groups, with multiple generators supported per dispatch group).
  • Plot: Math operations now supported in x and y axis manual limits.
  • Web App: Other users within a multiplayer Project can remove an inactive user - preventing a Node from being unmodifiable if a user is away.
Improvements
  • Engine: Added additional math operations (trig functions, degrees/radians conversions and logarithms) to math evaluator.
  • PSCAD™: PSCAD™ build and EMTDC™ run messages are now written to a dedicated log file, rather than the gridmo log file.
  • PSS®E Dynamic: Fixed unnecessarily conservative shortening of dynamic channels within PSS®E - standalone folder .out file results should now be easier to review, as channel names are only truncated if they are too long for PSS®E.
  • Plot: Interactive (HTML) plots have been optimised to load quicker, especially for very large files.
  • Plot: PDF main plot titles now wrap onto an additional line if the title is too long for the available space.
  • Plot: Subplot level legends (e.g. LEGEND= Arguments) now appear in the interactive (HTML) plot in the popup when you mouse over a plotted line.
  • Web App: Overlay Builder: Further improved performance for very large data files.
  • Web App: Subplot errors on a Plot page are now easier to find (new error icon added).
Fixed
  • Engine: Fixed error in Engine setup wizard if 'Back' is pressed when in the PSCAD™ software configuration window and direct (EMTDC™) mode testing is running.
  • Engine: Fixed Engine watchdog error if a PSCAD™ model generates excessive logs messages.
  • Engine: Fixed error where the Engine raises an error if being launched while the backup gridmo log file is open in Excel.
  • PSCAD™: Fixed inconsistency between the docs and smiby's implementation of the MAG= Argument in the VOLT_OSCIL Command.
  • PSCAD™: Fixed Advanced Parameter sim.snapshot.file= not being applied correctly due to a missing path seperator causing PSCAD™ to silently ignore the parameter.
  • PSS®E Dynamic: Fixed OUTPUT, LINE=, VAL=PF incorrectly ignoring METERBUS= Argument if it was specified.
  • PSS®E Dynamic: Fixed SET, AT=, SCR= and SET, AT=, XR= were not being applied unless both SCR= and XR= Arguments were provided. Now supports only SCR or only XR change in addition to both.
  • PSS®E Dynamic: Fixed error where a small number of user defined PSS®E models were raising a cannot find DYRMODEL= error due to inconsistent cases between the .dyr file and PSS®E.
  • PSS®E Dynamic: Modified ADD, TYPE=CAP and ADD, TYPE=REACTOR Commands to switch off the shunt, rather than delete it, to prevent some legacy user defined models from raising a floating point exception on its deletion.
  • PSS®E Static and PSS®E Dynamic: Deprecated set_nan_python() and set_fpcw_py() calls after launching PSS®E - gridmo's .out file parser does not require this configuration and we're aware it was causing model crashes in a small number of user defined models.
  • PSS®E Static: Fixed CONSIDER_EXISTING_DISPATCH=NO from being incorrectly applied at the end of a static solve when using low SCR mode - resulting in unexpected smoothing of generator terminal active and/or reactive power.
  • Plot: Empty subplots now appear in Interactive (HTML) Outputs - rather than empty spaces.
  • Plot: Fixed Engine validation error if manual y-axis values are specified, but then the subplot is changed back to auto scaling.
  • Plot: Scatter plots no longer report as Missing data in the PDF bookmarks or the interactive HTML sidebar.
  • Table: Fixed Table Node incorrectly truncating the filename if there is a dot in a subfolder and a file extension present.
  • Web App: Fixed error in Flow Checker if an Internode Variable has a square bracket in the variable name.
  • Web App: Fixed issue where changes to Scenario Variables weren't being saved when clicking outside the dialogue box.
  • Web App: Overlay Builder: Fixed bug where zoom stopped working if files had different timesteps.
  • Web App: Overlay Builder: Fixed fields being incorrectly flagged as incorrect when deselecting My tests have different column names checkbox.
  • Web App: Prevented the Paste Subplots option from incorrectly appearing as an option on non-Plot Nodes.

v1.6.1​

Release date: 17 September 2025

New
  • PSS®E Dynamic: CONTROL and OUTPUT commands now interface with generator 'other' type PSS®E user defined models.
Improvements
  • PSCAD™: Expanded retry with back-off logic to prevent the gridmo Engine from opening a .psout file before PSCAD™ has finished writing to the file.
  • Plot: Improved error message(s) generated when the gridmo Engine Runs out of RAM when generating plots.
Fixed
  • PSCAD™: If EMTDC™ raises an 'Access is Denied' error, this now triggers an automatic retry of the PSCAD™ Task.
  • PSS®E Static: Fixed error when auto-merging models if the SMIB model has bus '1' present - the Engine now searches both source and destination models for a spare bus number (was previously just destination model).

v1.6.0​

Release date: 12 September 2025

New
  • Documentation: Added additional information to docs to explain limited support for PSCAD™ v5.0.0.
  • Engine: Expanded Engine to better support corporate network proxies or some VPNs (added an alternative connection method).
  • PSS®E Dynamic: Added initial support for linear ramping of signals under some limited circumstances.
  • PSS®E Static and PSS®E Dynamic: Added support for PSS®E v36.3.
  • PSS®E Static and PSS®E Dynamic: Engine now raises a warning when merging two case files if the source and destination system base MVA do not match.
  • PSS®E Static: Added OUTPUT Command to export line and transformer loading to an Internode Variable.
  • Web App and Engine: Simulation caching is now controlled on a per-simulation level, rather than an Engine setting.
  • Web App and Engine: You can now select to force close existing Tasks on an Engine when pausing a simulation.
  • Web App: Added 'what's new' section to web-app home page.
  • Web App: New visual indicators added to web-app simulations view, to show if the simulation was launched with only first loops or with caching enabled.
  • Web App: Overlay Builder: Subplot commands can now be configured.
  • Web App: Overlay Builder: Now shows how much local storage is being used for overlay data and added option to delete stored files.
  • Web App: Released new code editor, with on-hover info and auto-complete.
  • Web App: The number of simulations running on each Engine is now shown in the launch window when selecting an Engine.
  • Web App: You can now open the last local save of a multiplayer Project from the web-app homepage.
Improvements
  • Engine: Engine now supports maths operations in all fields which support numerical input.
  • Engine: Setup Wizard now allows additional power systems software interfaces to be added without having to re-setup the existing interfaces.
  • Engine: Setup Wizard now allows manual selection of PSS®E installation directory (to support installations which are not in the default location).
  • Engine: Setup Wizard now saves in-progress configuration file in case of an error.
  • Engine: Setup Wizard now shows all default power systems software options on a single screen.
  • Plot: OSCILLATION_CALC Command was improved to better detect the oscillation frequency.
  • Web App: "Apply subplot changes" option now displays number of pages as well as number of subplot rows and columns.
  • Web App: Overlay Builder: Expanded support for extremely large playback files (>500 MB).
  • Web App: Table Node's 'Add column' button now in toolbar - to make it easier to find.
  • Web App: The web-app now remembers the Engine you last selected across web-app sessions.
Fixed
  • Engine: Fixed bug in worker licencing - if changed, does not automatically apply within 2 hours - incorrectly required an Engine restart.
  • Engine: Fixed on-hover popup for Engine state 'FORBIDDEN' didn't say the error was likely caused by multiple Engines Running on the same PC.
  • Engine: Fixed rare error where a single Task's gridmo log file would get so large it would roll-over (now maintains as one file).
  • PSS®E Dynamic and PowerFactory Dynamic: Now raises an error if SIMPLEFAULT calculates a negative impedance (use to be a warning).
  • PSS®E Dynamic: Fixed error if DISTANCE=100% or DISTANCE=0% in ADVFAULT.
  • PSS®E Dynamic: Removed sim.frequency.filter validator limitations.
  • PSS®E Dynamic: v35+ PLBVF1 playback generator model would only set Vscale (J+0) and Fscale (J+1) if the respective playback control was turned on. Where not set, PSS®E displayed a red square in the dynamics model view hinting at a potentially invalid value.
  • Plot: Fixed interactive (HTML) plots incorrectly say "Page 1" for subsequent pages in a Plot Node.
  • Plot: Fixed rare timeout error when generating a merged PDF with several hundred pages.
  • PowerFactory Dynamic: Fixed (under rare circumstances) where a dynamic simulation Runs longer than the specified time, if a subset of Commands are present with AT= values after the end of the simulation.
  • Web App: Fixed rare error if Control + Enter shortcut to launch a simulation is pressed twice quickly.
  • Web App: Fixed rare series of Scenario Variable changes which meant it was possible to get a scenario that didn't exist any more selected in the launch window's scenario selector.
  • Web App: Fixed rare simulation processing error if a comment is inside a Loop Variable which itself is inside a playback field.

v1.5.4​

Release date: 3 September 2025

Fixed
  • PSS®E Dynamic and PowerFactory Dynamic: Fixed rare issue in SIMPLEFAULT and VDISTURBANCE fault impedance calculation methodology where Xthev/Rthev = Xfault/Rfault.

v1.5.3​

Release date: 27 August 2025

Improvements
  • Engine: Implemented periodic automated working folder cleanup to reduce working folder size.
  • Engine: Reduced time interval between disk space checks.
  • Engine: Increased default hard drive space threshold from 5GB to 10GB during Engine setup.
  • PSS®E Dynamic: Improved the logic for detecting potential model files required for PSS®E Dynamic Tasks (e.g. files required by wrapper models). Improved logic captures fewer unneeded files and therefore reduces Standalone folder size.
Fixed
  • Engine: Resolved working task data cleanup failures during Engine shutdown and unexpected task termination.
  • PSS®E Static and PSS®E Dynamic: Updated interface logic for PSS®E versions >=34.9.6, <35.0.0.

v1.5.2​

Release date: 13 August 2025

Improvements
  • Engine: Improved logging and stalled process timeout for Plot merges to support extremely large output file generation.
Fixed
  • PSS®E Dynamic: Fixed VDISTURBANCE Command error not displaying correctly if the specified voltage target requires a capacitor which is in the unstable operating region of the Thévenin network.
  • PSS®E Static: Fixed an unexpected error in SET, LINE=, SCR=, XR= Command if the branch ID of the line is not 1.

v1.5.1​

Release date: 5 August 2025

New
  • Table: Added new add variable option to quickly add multiple Internode Variables from a linked Node.
  • Web App: New Action Node type released - used to track required changes to gridmo Templates (will be added to our default Templates in future).
Improvements
  • PSS®E Dynamic, PowerFactory Dynamic and PSCAD™: Updated VDISTURBANCE calculation methodology to have higher accuracy on target residual voltage when applying faults with very low X/R ratios.
  • PSS®E Static and PowerFactory Static: Improved static solver stability under very low initial SCR where a large change in X/R ratio is requested. When applying a SET, LINE=, SCR=, XR= the Engine will now ramp both the SCR and X/R ratio over several steps to prevent static solver instability (would previously just ramp SCR).
  • Web App: Increased maximum number of Global Variables and Scenario Variables that can be imported at once to 200 from 100.
  • Web App: Subplot configuration window now wider (to better display longer subplot Commands, like SETTLING_TIME).
Fixed
  • Engine: Fixed rare deadlock where an Engine is stuck on In launch queue when Running multiple PSCAD™ Tasks or PSS®E Dynamic Tasks after cancelling a simulation when multiple PSCAD™ windows were launching, or a PSS®E Dynamic task was initialising a dynamic study.
  • PSS®E Dynamic: Fixed VAL=ANGLE being incorrectly marked as invalid for OUTPUT, GEN= Command.
  • Web App: Fixed bug where pressing Undo could undo text back to the text from a different Node - only if that Node was the same type as the Node currently being viewed.
  • Web App: Overlay Builder: Fixed error in selected columns when copy and pasting Overlay Builders.
  • Web App: Overlay Builder: Fixed error when trying to save extremely large data files.
  • Web App: Overlay Builder: Fixed long time delay when adding a second Excel file to an Overlay Builder.

v1.5.0​

Release date: 24 July 2025

New
  • Data and Plot: Added OP=MAX_ABS to ADVOUTPUT Command.
  • Data: Added OUTPUT_PF and OUTPUT_MEAN Commands for constructing outputs from multiple columns.
  • Engine: Added new Engine help pages (warning if SCR changed on a branch that doesn't have a Thévenin bus on one end and warning if assets are islanded during a SOLVE Command).
  • Engine: Added new Engine overloaded mechanism to reschedule Tasks for later if an Engine is significantly higher than its CPU target (such as multiple PNI PSCAD™ Projects).
  • Engine: Added new PSCAD™ Transformer Energization example model to the gridmo Engine installer.
  • Engine: Standardised infinite SCR across all software platforms - setting SCR=INF now sets SCR to the largest stable cross-platform value for better benchmarking between software packages, rather than the lowest stable impedance on a per-software level. Added documentation explaining how this value is calculated.
  • Engine: Added the ability to override a time-series data source Node (e.g. Data Node, PSS®E Dynamic Node) to a specific colour.
  • PSCAD™: Added new PSCAD™ launch strategy to reduce extreme lag upon the Engine launching multiple PSCAD™ Tasks simultaneously.
  • PSS®E Dynamic: Added OUTPUT, TX=, VAL=TAPRATIO support for both two and three winding transformers.
  • PSS®E Dynamic: Added angles.relative.to.generator Advanced Parameter to specify a specific generator to calculate angles relative to (if not provided, defaults to largest generator on swing bus).
  • PSS®E Dynamic: SIMPLEFAULT Command now supports unbalanced faults, added unbalanced MULTIFAULT Commands to match PSCAD™'s MULTIFAULT Command.
  • PSS®E Static and PSS®E Dynamic: Added OUTPUT, LOAD= Commands.
  • PSS®E Static: Added new ADD, TYPE=GEN Command.
  • PSS®E Static: Added new warning if a SET, LINE, SCR=INF Command is used and the zero-impedance threshold is not equal to the PSS®E default value (as this may cause poor benchmarking with other software packages).
  • PowerFactory Dynamic: Added SET, TX=, AT=, TAPRATIO= Command.
  • Table: Added Excel (.xlsx) output type.
  • Table: Added conditional formatting support for (.xlsx) output type.
  • Table: Added min() and max() calculation support to Table Node cells.
  • Web App: Added additional team metrics to the Analytics page, such as number of each type of Task completed in last 30 days.
  • Web App: Overlay Builder - Added VAL= overrides for PowerFactory (added STATUS= and TAPRATIO=).
  • Web App: Overlay Builder - Added support for different Data Nodes to have different time steps in a single overlay.
Improvements
  • Data: Now automatically removes duplicate timesteps (as can be added if Running PSS®E manually) as part of processing, to prevent errors in subsequent Nodes.
  • Documentation: Moved details on available PSCAD™ OUTPUT channels from PSCAD™ page to smiby and termy pages.
  • Engine: Released new versions of gridmo Engine PSS®E interfaces - PSS®E v35 interface to align with PSS®E v34/v36 interfaces - plotting of partial results and automatic retries on PSS®E errors are now supported.
  • Engine: Updated Engine's stalled Task detection logic - now scales time before retrying based on the typical time that type of Task should take.
  • PSS®E Static, PSS®E Dynamic, PowerFactory Static, PowerFactory Dynamic and PSCAD™: Expanded requested software version on a per-Node basis - hard-setting the desired software version is no longer required.
  • PSCAD™: PNI/ENI enabled Projects now report percent complete to the gridmo Engine.
  • PSCAD™: PSCAD™ memory errors now trigger an automatic retry of the PSCAD™ simulation.
  • PSCAD™: Revised default state of PSCAD™ "Store feed forward signals for viewing" - now defaults to the as-set configuration in the PSCAD™ Project, but can still be overridden via Advanced Parameters.
  • PSS®E Static, PSS®E Dynamic, PowerFactory Static and PowerFactory Dynamic: Updated SET, TX=, TAPRATIO= Commands to prevent selection of a tap ratio which is invalid given the transformer's physical tap configuration.
  • PSS®E Static: CONTROL Commands with multiple generators with ATLINE=TERMINALS is now expanded to multiple independent controllers.
  • PSS®E Static: Standardised OUTPUT, VAL=LOAD% for lines and transformers to "Percent current loading of RATEA" - rather than the setting in the PSS®E case file.
  • PSS®E Static: CONTROL Commands now control generator types which have fixed reactive power of power factor limits (WMOD field).
  • Plot: Improved interactive HTML Outputs - plot titles and subtitles now wrap and fixed logos being aligned incorrectly.
  • Web App: Improved gridmo Project structure - can now support >5 MB gridmo Projects.
  • Web App: Active multiplayer Projects now autosave every hour.
  • Web App: Overlay Builder - Can now be converted from 1 Data Node to multiple Data Nodes without having to delete the Overlay Builder Node.
  • Web App: Overlay Builder - Large data files are now automatically compressed to save storage space.
  • Web App: Clicking 'View' on the Simulation snackbar (bottom right popup) now takes you to the Simulation Summary.
  • Web App: Simulation Summary in web-app now shows Task level progress.
  • Web App: Overlay Builder - Simplified "different column names" capability.
Fixed
  • Engine: Setup wizard incorrectly resets the shared directory to the working directory, even if the shared directory is set to something already.
  • PSS®E Dynamic: Fixed PSS®E error in CONTROL, DYRMODEL=, VAR= if the model referenced has lower case letters in the .dyr record.
  • PSS®E Dynamic: Fixed rare FORRTL write issue when Running multiple PSS®E wide-area models.
  • PSS®E Dynamic: SCALE_LOADS, SUBSYSTEM= raised unexpected error if subsystem was not ALL.
  • PSS®E Static and PowerFactory Static: Fixed generator(s) being reset to incorrect terminal limits if a CONTROL, GEN= Command appeared before a SET, GEN= Command, where the SET Command changes the limits of the generator.
  • PSS®E Static and PowerFactory Static: Fixed rare case divergence on first time step, even when changing to infinite SCR - the gridmo Engine now applies SCR changes over 10 steps to reduce chance of divergence.
  • Plot: Fixed bug in automatic scaling for frequency channels (where the variation in frequency over the simulation length is small, but the channel is not cantered around nominal).
  • Plot: Fixed unclear errors if RISE_TIME used within insufficient data points to calculate (given the START_T= and END_T= values).
  • Plot: Fixed rare issue where OSCILLATION_CALC can calculate the correct fundamental frequency, but not apply the correct vertical offset, causing an offset in the reconstructed channel.
  • Plot: The OSCILLATION_CALC Command incorrectly required the NAME= Argument, where it should have been optional.
  • Plot: Updated PDF output to no longer apply NaN or Inf vertical axis limits.
  • PowerFactory Static and PowerFactory Dynamic: If simulation has an error, an export of the .pfd file was created but not copied to the Standalone folder.
  • Table: Fixed bug where a Table Node could not find an Internode Variable in a column, but no warning was raised.
  • Web App: Files exported from Table, Loop:Start and Analysis Nodes did not include the Node ID.
  • Web App: Fixed - duplicate Global Variables and Scenario Variables can be created if one has extra whitespace (which is then auto-removed).
  • Web App: Fixed "Apply Subplot Changes" of properties inside left and right y-axis weren't actually applied for multiplayer projects.
  • Web App: Fixed Engine error if an alias-style Global Variable has multiple lines with comments.
  • Web App: Fixed Plot Node's "Apply Subplot Changes" from overriding the page-level titles, even if there was not a change.
  • Web App: Fixed Scenario Variables not correctly resolving if a Scenario Variable is present in another Scenario Variable.
  • Web App: Fixed bug preventing Flows from being re-ordered in a multiplayer Project.
  • Web App: Fixed bug preventing Simulation Summary info from being rendered in the web-app if the simulation is very large (>10,000 Tasks).
  • Web App: Fixed bug where a Task completes so quickly it doesn't update on the Simulation Summary view in the web-app.
  • Web App: Fixed rare web-app crash if viewing Simulation Summary and a status refresh occurs at the same time the simulation completes.
  • Web App: Fixed text content of Sticky Nodes not updating across users in a multiplayer Project.
  • Web App: Fixed version history in multiplayer Projects from always displaying "Add tag" as an option, even if there is already a tag.
  • Web App: Now prevents multiple users from editing the same Global Subplot/Global Variable/Scenario Variable at the same time in multiplayer Projects.
  • Web App: Overlay Builder - Events are now deleted if the source file is removed from Overlay Builder.
  • Web App: Overlay Builder - Fixed web-app crash if a data file is uploaded and it contains extra values which are not part of a column.
  • Web App: Overlay Builder - Improved support for exporting very large data sets to a transfer file.

v1.4.26.4​

Release date: 11 July 2025

Improvements
  • PSS®E Static: Automatic PSS®E model merge now uses same internal solving method as the SOLVE command (now applies reactive limits immediately, rather than at later iteration steps).
Fixed
  • PSS®E Static: Automatic PSS®E model merge incorrectly assigned a target voltage of 1.00 p.u. to the dummy generator used to slowly ramp up the active and reactive power from the merged generator. This was amended to now use the point of connection bus voltage as the target voltage. This voltage target mismatch could cause some wide-area PSS®E models to diverge on the first load flow after the merge is completed.

v1.4.26.3​

Release date: 8 July 2025

Fixed
  • Engine: gridmo Engine setup wizard no longer raises an error if no Fortran compilers are installed or available.

v1.4.26.2​

Release date: 7 July 2025

New
  • PowerFactory Dynamic: Added new Command SET, STATUS= to open or close circuit breakers or switches - or take equipment out of service - during a dynamic simulation.

v1.4.26.1​

Release date: 24 June 2025

Fixed
  • Engine: Fixed index 0 out of range error if the settings window is opened with no PSCAD™ compilers installed.

v1.4.26​

Release date: 24 June 2025

New
  • PSS®E Dynamic: Released new PSS®E .out file parsing method to support very large .out files.
  • Plot: Added optional per-page subtitles.
  • Web App: Simulation summary is now available in the Web App.
Improvements
  • Engine: gridmo Engine setup wizard now uses an alternative method to detect installed PSCAD™ compilers, ensuring it correctly refreshes the available options after running Fortran Medic.
  • Engine: Multiple Engine in an Engine group now create a single combined Simulation Summary file (rather than one per Engine).
  • Plot: SETTLING_TIME command now returns a settling time of 0 seconds if the channel is within the bands specified by FINAL_THRESHOLD_MIN= for all time-steps between the given START_T= and END_T= values.
  • PSCAD™: Compiler field now has the same format as PSCAD™. This has been updated in the gridmo Engine setup wizard and the gridmo Engine's settings window. The web-app now supports Fortran compiler names in both formats, the existing format and the same format as shown in PSCAD™ (e.g. Intel™ Fortran Compiler Classic 2021.XX.YY).
Fixed
  • Analysis: Records could (rarely) be added to the incorrect Analysis Summary file if multiple simulations are running at the same time on the same computer, or if being run between multiple gridmo Engines in an Engine group.
  • Engine: A Task which failed, then retried and completed successfully did not remove the failed Task record from the Simulation Summary.
  • Engine: A power system simulation Task which fails with partial results and then fails to export these partial results for plotting does not make a standalone folder, even if the simulation logging setting requests one.
  • Engine: Dynamic CPU percent target does not auto-load the most recently expired target when the Engine is launched.
  • Engine: Fixed rare RuntimeError causing gridmo Engine to crash when a worker is being flagged as completed and simultaneously being updated on the Engine's visual display.
  • PSS®E Static: Automatic PSS®E model merge does not assign the temporary generator used to align the voltage and angle at the connection point the correct initial scheduled voltage, which can cause some models to immediately diverge.
  • PSCAD™: Retired automatic firewall popup closing logic.

v1.4.25​

Release date: 16 June 2025

New
  • Engine: CPU target percent can now vary with time to allow variable CPU percentage at different times of the day.
  • Released termy - A new terminal measurement block for use in PSCAD™.
  • PSS®E Dynamic and PSCAD™: Added new optional Argument to MULTIFAULT Command which sets the minimum time between faults to the specified value.
  • Plot: Added Excel data file output file type.
  • Plot: Added bookmarks to .pdf and .html Plot output files.
  • Plot: Added HBANDS= Argument to RECOVERY_T Command.
  • Plot: Released new RISE_TIME Command, existing RISE_T Command no longer recommended for new Projects.
  • Plot: Released new SETTLING_TIME Command, existing SETTLE_T Command no longer recommended for new Projects.
  • Web App: Added global subplots - which makes it easier to standardise a subplot's titles and configuration throughout a gridmo Project.
Improvements
  • Engine: A simulation validation Task now auto-cancels all remaining Tasks, rather than generating plots which are just error pages.
  • Engine: Improved handling of Tasks which are in progress when an Engine is shut down (will now reschedule the Task).
  • Engine: Improved Engine log processing speed.
  • Engine: Improved validation check for Advanced Parameter field to better explain the error experienced when the Advanced Parameter field is accidentally used thinking it was the Description field.
  • Engine: Started enabling Command Arguments for math operations (docs updated with the Arguments that support, with more coming).
  • Web App: Overlay Builder - Added support for large data files.
  • Web App: Overlay Builder - Align index now directly modifiable.
  • Web App: Overlay Builder - Simulation length can now be specified (instead of dragging the green line).
  • Web App: The location of the view in the minimap is now more visible.
  • Plot: Improved memory efficiency when plotting multi-page plots with large numbers of subplots.
  • PSCAD™: Fixed SET, CNAME=, VAL= from raising an error if VAL= is a string.
  • PSCAD™: If you manually terminate a Running PSCAD™ simulation, it is scheduled for retry rather than treated as an error.
  • Web App: New error hint text added when viewing Commands in resolved view to help you find which Commands have errors.
Fixed
  • Engine: Fixed rare error when an End Run Task was launched while a dependent Task was still Running (leading to strange PSS®E errors in the simulation summary).
  • PSCAD™: Fixed rare Open failed 65535 error when loading PSCAD™ output files.
  • PSS®E Dynamic: Channel names could be too long for PSS®E to record, channel name now decoupled from Internode Variable name.
  • PSS®E Dynamic: TYPE= Argument was incorrectly flagged as optional for the ADVFAULT Command validator - is now mandatory as per documentation.
  • PSS®E Dynamic: Fixed error if the slack bus generator's ID is not 1 when preparing voltage and/or frequency playback.
  • PSS®E Static and PSS®E Dynamic: Short circuit display units are now standardised to per unit values in case files.
  • PSS®E Static: Fixed NoneType error if a static model is diverging and PSS®E returns a system mismatch of NaN.
  • PSS®E Static: Auto-merge now merges sequence data into the target model (if the source model has sequence data).
  • PSS®E Static: Auto-merge now no longer overrides the rating table names in the target model.
  • Plot: Fixed error where PNG output page numbers did not match renumbered one-index loop numbers.
  • Web App: Overlay Builder - now correctly warns a user of data loss if they refresh when modifying an unsaved Overlay Builder.
  • Web App: The cancel simulation could appear for users that cannot cancel other people's simulations (the button would not function, but now it doesn’t appear).
  • Web App: Fixed incorrect validation error if VALSCALE= has spaces between math operations.
  • Web App: Fixed the wrong loop number being displayed in a Loop: Start Node when there is a term in the search field.

v1.4.24.1​

Release date: 14 May 2025

New
  • Engine: 'Learn more' link in Simulation Summary now opens the docs page in a new tab.
Improvements
  • Engine: Small reduction in time taken for an Engine to launch a new task.
  • Plot: Interactive HTML plot background changed from light blue to white - to better align with PDFs created by the same Plot Node as the interactive plot.
Fixed
  • PSS®E Static and PowerFactory Static: Fixed error if a LINE= argument is used but the asset in the power systems model is actually a two-winding transformer, rather than a line.
  • Plot: Interactive (HTML) plot's on-hover legend shows an incorrect display name for error bands.

v1.4.24​

Release date: 13 May 2025

New
  • PowerFactory Static: Added SCALE_TX Command (same Command structure as PSS®E).
  • PowerFactory Static: Added SET, TAPRATIO= for 2 and 3 winding transformers (same Command structure as PSS®E).
  • PowerFactory Static: Added support for additional LINE= types - common impedance (ElmZpu) and series filter (ElmSfilt).
  • Web App and Engine: Loop numbers now start from 1, loop number now appears in the Loop: Start Node and no longer change when loops are enabled/disabled.
  • Web App: Added ability for an administrator to trigger a reset of a user's temporary credentials.
  • Web App: Added copy and paste for Overlay Builder Nodes.
  • Web App: Can now open gridmo's Examples directly in the web-app using the Examples menu option.
  • Web App: Overlay Builder now supports higher resolution data and has improved zoom capability.
Improvements
  • Documentation: Improved documentation on rise and settling time, included additional images and updated animations.
  • Engine: Engines in an Engine group now need to be the same Engine version.
  • Engine: Error displayed on Engine interface is now descriptive, rather than a simple error code, with details available on hover.
  • PSS®E Static and PowerFactory Static: Improved error and warning text if a bus, line or transformer is not present in the model or is out of service.
  • Plot: Added new Engine setting to allow subplot-level legends to be rendered outside of the subplot area (either under or to the right of the subplot, automatically selected based on the subplot's dimensions).
  • Plot: Channel details no longer gets cut off when hovering over interactive (HTML) subplot data.
  • Plot: Line thicknesses of interactive (HTML) plots now match the PDF plot output.
  • Plot: Interactive (HTML) plots now show secondary y-axis and grid lines.
  • Plot: Subplot level legends now include LEGEND= arguments from the secondary y-axis (previously was only the left y-axis).
  • Web App: Add check to prevent Loop Variables from referencing other Loop Variables.
  • Web App: Added 'NEW' marker on template window for new or major updates to gridmo's templates.
  • Web App: Flow Checker now detects Nodes which are only partially inside loops and flags them as invalid.
  • Web App: Flow Checker now re-runs whenever the Global Variables or Scenario Variables window is closed.
Fixed
  • Documentation: Corrected error in PowerFactory Static documentation where LINE= incorrectly stated it supported ElmShnt (has been corrected to ElmSind).
  • PSCAD™: Fixed rare PSCAD™ error if the gridmo Engine cannot find smiby in any case or library files.
  • PSS®E Static and PowerFactory Static: Fixed error if a model is loaded which has only one bus and that us is a swing/reference bus.
  • PSS®E Static: SET, BUS=, STATUS=x where x is an integer type-code would raise an unexpected error.
  • Plot: Fixed interactive HTML plot legends from clashing with their bounding boxes.
  • Plot: Interactive (HTML) plot incorrectly shows a recovery time of 0 seconds as a horizontal shaded area - fixed to now be a vertical dashed line.
  • Plot: Interactive (HTML) plots are missing a legend title for error bands.
  • PowerFactory Static: OUTPUT, LINE= Command was not correctly identifying the correct cubicle to meter when using a METERBUS= Argument when PowerFactory substations were being used.
  • Table: Fixed loss of table columns if a Plot is exporting values from multiple sources to a Table Node.
  • Web App: Filenames in a Plot Node could be incorrectly de-duplicated if there is a duplicated name between an Analysis Node and a Plot Node.
  • Web App: Fixed Flow Checker from raising false positives for Table Nodes with maths operations in it.
  • Web App: Fixed bug in Plot Node when switching between pages with subplots selected.
  • Web App: Fixed rare copy-paste bug when copying subplots between Plot Nodes with different numbers of rows and columns.
  • Web App: Fixed typo in Flow Checker validation for TYPE=SOLID Argument for DRAW_LINE Command.
  • Web App: Improved Project restore capability for very large Projects (could time out).
  • Web App: Overlay builder bug where a Excel file was uploaded which only has one sheet (couldnt select from the dialog box).
  • Web App: Run-level simulations view would cut off the Task IDs if multiple scenarios are present.
  • Web App: Scenario Variable resolved view check was incorrectly resolving commented out Scenario Variables.
  • Web App: Simulation progress could rarely show as a negative value.
  • Web App: Subplots were accidentally being validated by Flow Checker when they are off the page (causing confusing errors).
  • Web App: Typing in the launch dialog's description field is slow for very large Projects.

v1.4.23.2​

Release date: 15 April 2025

Improvements
  • Engine: The Engine setup wizard now searches in the directory PSS®E v36 installs Python 3.11, thereby removing the requirement to manually specify the Python install directory if Python 3.11 was not otherwise installed.
Fixed
  • PSCAD™: PNI-enabled projects, with an OUTPUT, TITLE= command without a LOCATION= argument, would incorrectly flag as not found if the PSCAD™ output channel block was not located within the first PSCAD™ case file specified in the PSCAD™ workspace file.
  • PSCAD™: The warning raised for an OUTPUT, TITLE= command without a LOCATION= argument (such as a missing or ambiguous channel warning) would display incorrectly in the Simulation Summary. The warning would display (.) at end of the warning, rather than details on the TITLE= that had the warning.
  • Plot: Rise time (RISE_T) calculations on channels with substantial undershoot that crosses into the negative vertical axis could incorrectly start the rise time calculation too early, leading to the rise time calculated being over-stated (e.g. longer than the actual channel's rise time).

v1.4.23.1​

Release date: 8 April 2025

Fixed
  • Engine: The Engine setup wizard can get stuck on the 'Engine ID' setup stage if no gridmo configuration file is present.

v1.4.23​

Release date: 7 April 2025

New
  • Data: Added field for timestep in the Data Node and it is automatically populated by Overlay Builder.
  • Documentation: Added AI search into gridmo documentation website.
  • Documentation: Added Overlay Builder into the gridmo documentation website.
  • Documentation: Errors and warnings page added. This page contains information on common Engine errors and warnings, including fixes and impact of warnings.
  • PSCAD™: Added new warning to identify channels with an ambiguous definition (e.g. if the PSCAD™ model matches multiple output channel blocks).
  • Plot: Each page can now have independent numbers of rows and columns. The subplot configuration is now a closer representation of what you see on your output plot.
  • Table: Math operations and conditional logic now supported in Table Node cells.
  • Web App: Admin users can now cancel simulations launched by other users.
  • Web App: Columns can now be rearranged in Loop: Start Nodes.
  • Web App: Multiple Engines in the same processing group now show their statuses individually in the web-app.
  • Web App: Overlay builder now supports Excel files (.xls and .xlsx).
Improvements
  • Engine: PSCAD™ licence is no longer automatically released at the end of the Engine setup wizard.
  • PSCAD™: Removed slow and fast PSCAD™ pre-processing modes and standardised launch methodology (some OEM models previously required a special launch mode - this should no longer be required).
  • PSCAD™: The model in the standalone folder no longer has channels renamed from their TITLE= Argument to the NAME= Argument, making it easier to review what Outputs were selected.
  • PSCAD™: The model in the standalone folder no longer has unused channels disabled, making it easier to debug.
  • PSS®E Static and PowerFactory Static: Revised CONTROL, Q=VDROOP, DROOP%=0 to instead use a supervised VDIRECT control mode (direct voltage control with remote limits).
  • Plot: Expanded from a maximum of 3 pages to 10 pages per Plot Node.
  • Web App: Added additional text to the 'Apply subplot changes' to explain what filtering can be applied.
  • Web App: Adjusted width of the Notes column in the Global Variables view (was too narrow on small screens).
  • Web App: Overlay builder now allows simulation time to be specified (rather than dragging the End green line to the required value).
Fixed
  • Engine: Meta key error if an Engine which is unauthorized requests a licence.
  • PSS®E Static and PowerFactory Static: OUTPUT, BUS= Command incorrectly ignores VALSCALE= if specified.
  • Plot: Removed the immediate recovery time warning from the RECOVERY_T Command.
  • PowerFactory Static: Removed excessive warnings about duplicate bus numbers at end of a static simulation for Projects with substations in the model.
  • Web App: Added new Interconnected Loops error for Edges connected between loops (previous error was unclear on what to action).
  • Web App: Double pressing Control & Enter now launches a simulation (previously only opened the launch window).
  • Web App: Fixed small syntax highlighting bug (GEN = and GEN= are both valid, but only one was coloured correctly).
  • Web App: In multiplayer Projects it is possible to select Nodes across Flows.
  • Web App: Pressing delete incorrectly deletes the Overlay Builder Node if pressed when the Overlay Builder window is open.
  • Web App: The viewport (where you are viewing) is now saved when a multiplayer Project is downloaded.

v1.4.22.2​

Release date: 25 March 2025

New
  • PSS®E Static and PowerFactory Static: Added new optional argument IGNORE_CONTROL_IF_OFFLINE= to SOLVE Command. If set to YES, CONTROL Commands are ignored if all assets controlled by the CONTROL Command are offline.
Improvements
  • PSS®E Dynamic: Removed limit on sim.maxiter Advanced Parameter (was previously limited to 600 iterations).
Fixed
  • Engine: Fixed rare permission error when creating a Standalone folder, typically seen in PSS®E Dynamic tasks.

v1.4.22.1​

Release date: 14 March 2025

New
  • PSS®E Dynamic: Added alternative playback generator mode - to support OEM models which require the playback generator model to be located in the same .dyr file as the other dynamic models (not merged separately).
  • PowerFactory Static: SET, OBJECT_NAME=/FOREIGN_KEY= now has new ROW= Argument for setting variable values which are within tables.
Improvements
  • PSS®E Static: If SET, PMAX= or SET, PMIN= is used, the generator's active power is now clamped to be within the new limits.
Fixed
  • Engine: Occasional duplication of the table header in the Engine's worker summary table view.
  • PSS®E Static and PowerFactory Static: Fixed error printing giving unclear 'bound method' text instead of the bus number if a bus is out of service or doesn't exist.
  • Plot: Text to show scaling factor applied to the y-axes now auto-scale to match the size of the rest of the subplot text.
  • PowerFactory Static: Bus status incorrectly not checked when getting pre-convergence bus voltages to determine voltage limits - causes 'DataObject has no m:u property' error.

v1.4.22​

Release date: 7 March 2025

New
  • Engine: Added hyperlink to each Task's Standalone folder inside the Simulation Summary.
  • Engine: Added maximum cache size setting to Engine settings window.
  • Engine: Tasks now show progress within the current Task on the Engine console window.
  • PSCAD™: Added PSCAD™ launch checks - if a build error occurs and gridmo identifies a likely issue, additional information will be provided (such as absolute paths in resources, or linked libraries not being copied to the EMTDC™ working directory).
  • PSCAD™: Added warning when PSCAD™ plot step exceeds 1 ms (as this may lead to aliasing or inaccurate plot calculations).
  • PSS®E Dynamic: Added support for PSS®E Dynamic wrapper type models (where an external executable or library is called).
  • PSS®E Dynamic: Now detects and raises dedicated error if 'Run may not be accessible' condition detected during dynamic model initialisation due to missing .dyr record for one or more generators.
  • PSS®E Static and PSS®E Dynamic: Added new SCALE_TX Command to allow easy testing for a lower number of aggregated inverters.
  • Plot: New OSCILLATION_CALC Plot Node Command added to calculate damping ratio of generator responses.
  • Table: Transposed output selection added (to switch rows and columns in table Node output files).
  • Table: Updated with new option to toggle between grouping all columns together, or split by Outputs description and legend, in Table Node.
  • Web App: Added ability to drag and reorder Flows.
  • Web App: New simulation status view with improved mobile experience.
  • Web App: Overlay Builder now has an option for overlaying only Data Nodes.
Improvements
  • PSCAD™: Will now automatically retry rare 'ConnectionResetError' object has no attribute '_initialize' error during PSCAD™ launch.
  • PSS®E Dynamic, PowerFactory Dynamic and PSCAD™: Increased character limit for 'Outputs Description' field.
  • PSS®E Static and PSS®E Dynamic: Removed requirement for specifying the API as part of selecting a non-default PSS®E version. Now, PSS®E version is the only one required.
  • PSS®E Static and PSS®E Dynamic: Standalone folder PSS®E macro now automatically loads a SLD if there is a SLD available in the standalone folder.
  • PSS®E Static: Now raises a warning when requesting a value on a component which is out of service (previously raised error).
  • Plot: ADVOUTPUT, OP=OVERSHOOT% now calculates using the average value of the last 10% of the data (to prevent inaccurate results with highly oscillatory signals).
  • Plot: Reviewed PDF and PNG line thicknesses (now more standardised look and feel between different number of subplots).
  • Plot: Size of sub-plot Commands' visual markers (circles, dashed lines etc) now scale with the size of the subplot.
  • Web App: Added undefined variable Flow checking on plot subtitle and Outputs description.
  • Web App: Expanded maximum simulation time display on simulations view - was previously a maximum of >1 day.
  • Web App: Flow checker now clarifies that the stated line number(s) refer to the resolved view.
  • Web App: Increased number of Argument overrides in Overlay Builder.
  • Web App: Launching a simulation is now blocked if the selected Runs contain Scenario Variables, but no scenarios are selected.
  • Web App: Overlay Builder now supports multiple meters - making it easier to benchmark firmware updates or multi-meter setups.
  • Web App: Run-level simulations view now shows errors at the run-level, not just simulation-level.
Fixed
  • Analysis: Fixed rare bug in Analysis Summary title fields caused by special characters not rendering correctly.
  • Engine: Engine now ensures temporary files in the Working folder are cleaned - removed 'Access denied' warning from simulation summary.
  • Engine: Engine updater now updates last seen Engine version at the very end to prevent skipping configuration file updates after an update failure (such as lack of internet).
  • Engine: Fixed permission error when opening the gridmo Engine Settings window (caused by write access being unnecessarily required for linked Python directories).
  • Engine: Fixed rare bug where the Engine launches additional Tasks before existing cancelled Tasks are stopped.
  • PSCAD™: Build and Runtime messages from PSCAD™ were not outputted to the gridmo log file until after gridmo parsed the log for errors (making debugging unnecessarily harder).
  • PSCAD™: Fixed KeyError if slow pre-processing mode is enabled and VALSCALE= Argument is present in an OUTPUT Command.
  • PSCAD™: Fixed crash with no error when reloading case files due to clashing PSCAD™ viewports.
  • PSS®E Dynamic: Removed unnecessary limitation on simulation time step (maximum time step use to be 1 ms).
  • PSS®E Static and PSS®E Dynamic: Engine now raises a specific error if the selected PSS®E version requires a link to Python that is disabled.
  • Plot: ADVOUTPUT, OP=OVERSHOOT% now returns negative values for negative overshoots (was previously 0).
  • Plot: Fixed error in ADVBANDS where the Engine incorrectly believes there is no common data between signals with no common time steps.
  • Plot: Fixed error where a Plot Node has no main legend but one or more data legend (such as a Scatter Plot with only a DRAW_LINE Command).
  • Plot: Output plots (PDF and PNG) now show the colour of the shading in their legends - to match the interactive HTML plots.
  • Plot: Scatter Plot error if connected to a Table Node which has cells which are all empty.
  • Plot: Subplot-level legends now auto-scale with the subplot size (to prevent overlapping with the plot contents).
  • Plot: Data legends could display an excessive number of decimal places for some commands (such as ADVOUTPUT) - now displays a maximum of three decimal places on the Plot legend.
  • PowerFactory Static and PowerFactory Dynamic: Fixed bug where a BUS= Argument which does not exist in the Project would not raise an error, only a warning.
  • Web App: Fixed bug where the Apply button is not enabled until you click off the grid (in Loop Start Nodes or Analysis Nodes).
  • Web App: Fixed issue where moving Overlay Builder can cause the Nodes inside the Overlay Builder to go outside the Overlay Builder Node boundary.
  • Web App: Simulation launch window no longer resizes when you deselect all Runs options (to prevent annoying UI movement).

v1.4.21.6​

Release date: 25 February 2025

Fixed
  • Engine: Fixed uncommon local variable 'C' error occurring at end of a power system simulation, most commonly seen in PSSE Static or PSS®E Dynamic simulations.

v1.4.21.5​

Release date: 19 February 2025

Improvements
  • PSS®E Static and PSS®E Dynamic: Increased PSS®E v34 and v36 launch timeout from 45 seconds to the Engine's timeout setting (defined in the Settings window).

v1.4.21.4​

Release date: 12 February 2025

Fixed
  • PSS®E Dynamic: Fixed CONTROL, RELVAL= command raising unexpected error "Unknown model type" for USRBUS type (BUS=) and miscellaneous type (MINS=) dynamic models.

v1.4.21.3​

Release date: 7 February 2025

New
  • PSS®E Static and PSS®E Dynamic: PSS®E v34 and v36 now have a dedicated gridmo log file to help resolve PSS®E launch issues.
Improvements
  • PSS®E Static and PSS®E Dynamic: Improved connection reliability for PSS®E v34 and v36, increased the connection attempt retry count.
Fixed
  • PSS®E Dynamic: CONTROL, MINS=, RELVAL= Command raises no such model at bus 0 error, due to incorrectly searching for bus-type models prior to miscellaneous models when finding the existing value to calculate for RELVAL=.
  • PSCAD™: Fixed Plot Node error if a PSCAD™ output block is disabled and this disabled output block matches an TITLE= argument in an OUTPUT Command.
  • PSCAD™: Fixed OUPTUT commands with duplicate TITLE= arguments occasionally not outputting the duplicate channel to a connected Plot Node.
  • PSCAD™: Fixed error when starting PSCAD™ task if an Excel file is open in the PSCAD™ model's inputs folder.

v1.4.21.2​

Release date: 3 February 2025

Fixed
  • Plot: Fixed 'ufunc' error if COUNT_EDGES Command used with START_T= and/or END_T= argument when connected to a PSS®E Dynamic simulation.

v1.4.21.1​

Release date: 3 February 2025

New
  • Engine: Added validators to prevent negative values from being set in SCR= and XR= Arguments.
  • Plot: New Command COUNT_EDGES added for FRT retriggering detection.
Improvements
  • PSS®E Static and PowerFactory Static: Deprecated voltages.lower and voltages.higher Advanced Parameter, improved network model static voltage convergence checks (now uses the existing highest and lowest voltages, rather than fixed 0.85 and 1.15 p.u. limits).
Fixed
  • PSCAD™: If a PSCAD™ simulation is cached, the standalone folder is incorrectly a copy of the inputs folder, not the modified model (does not affect plot results, just standalone folders).
  • PSS®E Static and PowerFactory Static: Adjusted the default static solver reactive power limits from 'Apply at 99 iterations' to 'Apply immediately' to improve convergence performance for large network models.
  • PSCAD™: If 'slow' PSCAD™ output channel processing mode is selected (the default is 'fast') the PSCAD™ Node does not output any results (e.g. no channels appear in connected Plot Nodes).
  • PSCAD™: If 'Power systems software working files' was selected on the Launch prompt and a cached PSCAD™ result was available, the standalone folder would not contain all working files as requested, only the core standalone files are copied into the all-temp folder.
  • Plot: Rare error when making a combined PDF - if a simulation is cancelled, the Engine attempts to merge all generated plots - if any plot is partly saved or corrupted, the merge will fail, raising an error.
New

v1.4.21​

Release date: 23 January 2025

New
  • Engine and Web App: Simulations will output Plots, even if a connected power system simulation has failed. Missing pages will have a warning placeholder and the file name is appended with a warning symbol.
  • PSCAD™: Added new LOCATION= Argument in OUTPUT Command to allow distinguishing output channels located inside copies of the same module (e.g. multiple identical aggregated inverters).
  • PSS®E Static and PSS®E Dynamic: Added PSS®E v36 support - the same gridmo Commands and features are available in this new version.
  • PSS®E Static and PSS®E Dynamic: Added multi-shot automated retry when launching PSS®E v34 and PSS®E v36.
  • Web App: Order of Global Variables and Scenario Variables can now be changed by dragging and dropping.
Improvements
  • Data and Overlay Builder: Invalid characters in Data column names are automatically removed when loading the data (in both the Engine and the Overlay Builder).
  • PSCAD™: Improved error description when a PSCAD™ simulation is launched in direct (EMTDC™) mode, but the Engine Setup process has not been Run.
  • PSS®E Dynamic: Improved error description for PSS®E library add error.
  • PSS®E Static and PowerFactory Static: Removed ATLINE= Argument backwards warning as we've seen too many false positive warnings, especially under low SCR conditions.
  • PSS®E Static and PowerFactory Static: The QMIN= and QMAX Arguments are now optional in the CONTROL, GEN=, Q=VDIRECT Command.
Fixed
  • Templates: Template Library table's sort order of 'Last updated' column now sorts chronologically, not alphabetically.
  • Engine: Released new version of gridmo Updater (v1.2) - fixed different Windows version support between Engine installer and Updater installer.
  • Engine: Wrong version of E006 data packaged with the gridmo Engine installer.
  • PSCAD™: Direct (EMTDC™) mode now disabled if the Workspace looks like a PNI-enabled Project, regardless of the Engine setting to Run simulation sets or not (to avoid a failing to launch PSCAD™ error).
  • PSCAD™: Fixed rare unbound local error when pre-processing PSCAD™ case files.
  • PSCAD™: Rare smiby config file creation error due to PSCAD™ returning different value types.
  • PSCAD™: Regression in PSCAD™ workspace PNI detection - fixed PSCAD™ libraries being incorrectly flagged as PSCAD™ cases, which was causing the Engine to flag the Workspace as PNI-enabled.
  • PSS®E Static and PSS®E Dynamic: Standalone folder now automatically removes any temporary .out file present when runing the script via PSS®E.
  • PSS®E Static and PowerFactory Static: When using CONTROL, GEN=, Q=VDIRECT the controller does not check if the target bus is in service.
  • PSS®E Static: Removed 'Could not reset generator V target' warning (only expected to occur in very early versions of PSS®E34).
  • Plot: Log x-axis could rarely draw additional scientific notation labels on the x-axis in addition to the expected x-labels.
  • PowerFactory Static and PowerFactory Dynamic: Now raises a warning if multiple buses with the same name are found.
  • Web App: PSS®E Static Node Command SET, GEN= incorrectly identified VALSCALE= as an invalid Argument in Flow Checker.

v1.4.20.1​

Release date: 13 January 2025

New
  • PSS®E Static: Added CONSIDER_EXISTING_DISPATCH= Argument to the CONTROL Command to allow the generator's initial dispatch values to be ignored - instead, the dispatch values are forced to be distributed equally amongst the controlled generators (weighted by their MVA bases). This can help multi-generator models benchmark with other software packages.
Improvements
  • PSS®E Static: Low SCR mode could interface with incorrect generator controller if there are multiple CONTROL, GEN=, Q=VDIRECT controllers under limited circumstances.
  • Plot: Improved error description if the x-min or x-max range for a time series plot is left blank.
  • Plot: Improved the 'not enough data' error for GRADIENT Command clearer (now includes x-axis range used in the calculation).
Fixed
  • Engine: Fixed error if there is no licence expiry date set.
  • Engine: Fixed rare undefined process variable in the gridmo Engine Setup Wizard when setting up PSCAD™.
  • PSS®E Static: Low SCR mode does not adhere to converged at limit Advanced Parameter (could lead to unexpected 'Low SCR mode - final check failure' errors).
  • Plot: Auto subplot y-axis scaling for frequency channels would fail to auto-scale if frequency settled in a small frequency range (approx 50.25 Hz).
  • Plot: The interactive HTML plot output renders with empty cells in incorrect locations and with incorrect sub-plot titles (PDF outputs are unaffected).
  • Plot: GRADIENT Command prevents the plot from being generated if the calculation results in a single data point in the gradient result.
  • Plot: Out of memory errors when generating plot Outputs now trigger an automated retry.
  • Plot: SIMPLEBANDS and DELTA_ERRORBANDS - incorrect 'no data in between BAND_START_T= and BAND_END_T=' warning if no identical x-values between plot channels.

v1.4.20​

Release date: 7 January 2025

New
  • Data: Excel (.xls and .xlsx) now supported - was previously just .csv.
  • Documentation: Interactive "Compare grid codes" page released.
  • Documentation: New examples released for multi-merge for PSS®E network models, colour assignment on scatter plots and identifying SCR from site data.
  • Documentation: WECC-Solar and smiby now have dedicated pages and download links.
  • Engine: Engine now checks file paths exist in SETFILE Commands as part of pre-simulation launch validation.
  • Engine: Simulation summary now states if a cached result was used (and what simulation ID the result was taken from).
  • Overlay builder: Automatic detection of events within the simulation window.
  • Overlay builder: Outputs from the integrated Data Node now has expanded OUTPUT Command creation capability.
  • Plot and Table: Blank and duplicate filenames are now automatically managed and resolved as part of simulation processing.
  • Web App: Added organisation level roles (Admin and User) - all new gridmo users in your organisation default to User.
  • Web App: Invalid Flows (such as cycles or missing end Run Nodes) are now included into Flow Checker.
  • Web App: Organisation administrators can now delete users and Engines from your organisation.
  • Web App: Organisation-wide Analytics view which includes total simulations launched and average simulation duration.
Improvements
  • Engine: Simplified Engine setup wizard for PSS®E34 (no longer requires Python 2.7 dependencies).
  • Engine: Improved Engine updater launch, now automatically launches for manually-completed Engine updates.
  • PSCAD™: Simulation cache check speed now much faster.
  • PSS®E Dynamic, PowerFactory Dynamic and PSCAD™: SETFILE Command now supports additional parameter styles (such as configuration files with square bracket titles).
  • PSS®E Static and PowerFactory Static: If SOLVE Command cannot resolve all CONTROL Commands, the simulation summary now includes details on what prevented the case from converging.
  • PSS®E Static: Improved low SCR mode algorithm - supports much lower SCR via automatic multi-stage solver.
  • Plot: Expanded from max 4 rows, 4 columns (16 subplots) to max 6 rows, 6 columns (36 subplots) per page.
  • Plot: Simulation ID now visible in plot debug text in the bottom right.
  • Web App: Added a visual indicator that there are Commands on a subplot.
  • Web App: Redesign of Sticky Nodes - now resizable with configurable font size.
  • Web App: Redesigned "Add Flow" popup to maximise space for the table of available templates, direct JSON upload now moved to dedicated button.
  • Web App: Resolved view now allows Scenario Variable and Loop Variable selection.
  • Web App: Simulation launched popup and simulation cancelled popup have been replaced with a snackbar.
Fixed
  • Data: Time step of format hh:mm.ss raise a ParserError caused by the time step detection algorithm incorrectly parsing minutes as hours.
  • Engine: Tasks which become unresponsive are incorrectly set to error, rather than scheduling for retry.
  • PSS®E Dynamic: Excessive Engine warnings if a PSS®E Dynamic Node exports a channel into a playback generator of a PSS®E Dynamic or PSCAD™ Node.
  • PSS®E Dynamic: Playback generator frequency has incorrect offset for Projects with 60 Hz base frequency.
  • PSS®E Static and PSS®E Dynamic: Suppress "Recording terminated" console message (only present in some PSS®E versions).
  • PSS®E Static: Removed unnecessary setting of PSS®E's static solver parameter ACCM (Gauss-Seidel load bus acceleration factor) to the value of the system.convergence.mva Advanced Parameter.
  • PSS®E Static: Fixed minimum acceptable of system.convergence.mva Advanced Parameter, was incorrectly 0.001, now 0.1.
  • Plot: Incorrect font was present on Interactive (HTML) plot Outputs on the x-axis and y-axis tick numbers.
  • Plot: Rarely, the left y-axis title could be cut off in scatter plots with large number of decimal places in y-axis tick labels.
  • Plot: Subtitle now automatically wraps to prevent clashing with logo(s) in top right of PDF and PNG plots, will wrap to a maximum of two lines.
  • PowerFactory Dynamic: Disabled low SCR mode by removing of low.scr.mode Advanced Parameter, as not yet fully supported.
  • Table: Filename validator is inconsistent between Plot and Table Nodes - Table Node now has the same acceptable characters as Plot Node.
  • Web App: Simulations which are greater than 1 week since launched are now automatically cancelled.

v1.4.19.1​

Release date: 16 December 2024

New
  • PSS®E Dynamic: Added SCALE_LOADS Command to apply absolute or relative load scaling to all loads in a case.
Fixed
  • Data: OUTPUT, AT= and ADVOUTPUT, START_T=, END_T= time values are incorrectly referred to the source data, not the data after applying the x-axis shift from manual or automatic alignment.
  • Engine: Clashing text on licence key screen of Engine Setup Wizard when a successful validation occurs after a validation failure.
  • Engine: Rare error where gridmo Engine Setup Wizard gets stuck on the Fortran Medic step.
  • Engine: Rare simulations stuck due to a Task failing to start and being stuck in the Starting state.
  • PSS®E Dynamic: SET, TAPRATIO= Command only worked in PSS®E Static studies, now expanded to PSS®E Dynamic studies.
  • PSS®E Dynamic: When using USRBUS models, the DYRMODEL= name field was incorrectly case sensitive (PSS®E applies upper case to all loaded model names).
  • Web App: Syntax highlighting was missing for WINDING= and TAPRATIO= Arguments in the PSS®E Static SET Commands.

v1.4.19​

Release date: 27 November 2024

New
  • Data: ADVOUTPUT now available. Has similar functionality to the Plot Node Command of the same name.
  • PSCAD™: Added new Argument for enabling/disabling an object in PSCAD™ using the SET Command.
  • PSCAD™: Enabled direct (EMTDC™) launch mode for PSCAD™ v5.0.2.
  • PSS®E Dynamic, PowerFactory Dynamic and PSCAD™: Now supports multiple playback types (voltage, frequency and angle) with automatic interpolation.
  • PSS®E Dynamic, PowerFactory Dynamic and PSCAD™: Voltage, frequency and angle playback now supports playback via time series Internode Variable.
  • Templates: Released ElectraNet (South Australia)GPS template [AUS].
  • Templates: Released NERC PRC-024-2 Generator frequency and voltage ride-through template [USA].
  • Templates: Released New England ISO Model Acceptance Tests (PP5-6 Appendix C2) [USA].
  • Templates: Released UK G99 studies template [UK].
  • Web App: Added automatic detection of events to overlay builder.
  • Web App: Can now delete users and Engines from your gridmo organisation.
  • Web App: Mini-map in bottom right is now clickable to navigate to that part of the Flow.
  • Web App: New right-click context menu option to delete the selected Node(s) and Edges.
Improvements
  • Analysis: Improved error handling for analysis record where either the left and/or right side of the equation is blank.
  • Data: Improved error handling if the specified row index is not a valid integer.
  • Engine: Increased PowerFactory licence acquisition timer in setup wizard.
  • Engine: New dynamic worker scaling algorithm released (faster to increase and decrease workers to maintain target CPU load).
  • Engine: SETFILE Command improvements, specifically to support parameters with special characters such as [ and ].
  • PowerFactory Static and PowerFactory Dynamic: Improved error handling if the first bus specified in the LINE= Argument for a VDISTURBANCE Command cannot be found in the PowerFactory model.
  • PowerFactory Static and PowerFactory Dynamic: Improved error handling if the specified GEN= cannot be found in the PowerFactory model.
  • PSCAD™: Expanded valid character list for TITLE= argument to better align with supported characters in PSCAD™.
  • PSCAD™: SET, CNAME= now searches all loaded case files and all loaded library files (previously only searched case files).
  • PSS®E Static and PSS®E Dynamic: Suppressed recording terminated log message (only present in some PSS/E versions).
  • Web App: Overlay builder now allows duplicate file names, so the same file can be loaded multiple times and different areas selected.
  • Web App: Overlay builder now shows the time (in seconds) since the start of the data on mouse-over.
  • Web App: Removed default of 1 MW for Project rated active power, now needs to be specified prior to launching a simulation for a new Project.
  • Web App: Renamed "Empty Handle" error when launching Tasks to something which explains better how to fix the error.
Fixed
  • Engine: Rare out-of-order completion of simulation Tasks.
  • PSS®E Static and PSS®E Dynamic: Error if using SMIB to Network auto model merge feature and there are no swing buses present in the source (SMIB) model.
  • PSS®E Static: Auto-merge algorithm will now raise a more descriptive error if the specified source bus is a swing bus - as this is not supported.
  • PSS®E Static: Error if there are no swing buses present in the source (typically SMIB) model when auto-merging into a network model.
  • PSCAD™: No results generated if a workspace file has at least one library file and simulation sets present which are invalid (e.g. are copied or left-over from a previous PSCAD™ model) due to incorrectly triggering PNI-enabled simulation mode.
  • Plot: New plot Nodes now use Auto rather than Auto Tight y-axis scaling modes for the second y-axis.
  • Web App: "Simulation failed" popup display in bottom of web-app rarely didn’t appear if the simulation fails processing.
  • Web App: Deleting and adding a Node incorrectly leaves the Node configuration panel open.
  • Web App: Flow checker incorrectly raised error on VALSCALE_xPOC (e.g. VALSCALE_VPOC=) if math operations were present.
  • Web App: Overlay builder could display empty file name when loading from an export.
  • Web App: Rare overlay builder crash when loading data with no values.
  • Web App: Text cut off on detailed simulation status view if Scenario Variables are present.
  • Web App: Web-app crash if an overlay builder is deleted (under some circumstances).

v1.4.18.2​

Release date: 13 November 2024

New
  • PowerFactory Dynamic: Now supports unbalanced faults using SIMPLEFAULT, TYPE=.
Improvements
  • Table: Equals signs now supported in table row data - previously raises a multiple equals sign error.
Fixed
  • Engine: Legacy API connection with PSS®E can remain open if a PSS®E Task fails and is automatically retried.
  • Engine: Occasional 'NoSuchProcess' exception for Engines with very high worker count when closing PSCAD™.
  • Engine: 'Unrecognised hex colour format' error caused by scatter plots incorrectly merging data from a Table Node, where the underlying data source (e.g. PSCAD™) has multiple LEGEND= Arguments.
  • PSS®E Dynamic: Angle changed via angle playback in 'Control Thévenin equivalent source' field can have an opposite sign if the Thévenin (slack) bus number is higher than the point of connection bus number.
  • PSS®E Dynamic: Silent error on using SET, AT=, LOAD=, SET, AT=, TX= or SET, AT=, FSHUNT= Commands on PSS®E network cases.
  • PSS®E Dynamic: Unexpected error if an ADD, TYPE= Command is used in a dynamic simulation where AT= is not specified.
  • PSS®E Dynamic: Warning on missing DYRMODEL= is incorrectly case sensitive - can give false positive warnings.
  • PSS®E Static and PSS®E Dynamic: Added check for PSS®E to Python redirect to support versions of PSS®E without redirect support (e.g. 34.9.0).
  • Plot: Subplot level legends from a linked Data Node incorrectly use the last specified LEGEND= Argument for all legends, rather than the one specified in the OUTPUT Command.

v1.4.18.1​

Release date: 4 November 2024

New
  • Plot: Scatter plots can now have sub-plot level legends.
Improvements
  • PSS®E Dynamic, PowerFactory Dynamic, PSCAD™ and Plot: Relaxed validation on LEGEND= Argument, now supports spaces and special characters (other than , and =).
  • PSCAD™: Released new version of smiby block (v19):
    • Fixed incorrect base value applied to positive/negative reactive current (IQ) and positive/negative active reactive current (ID), output channel unit is now consistent with total IQ and ID.
Fixed
  • Engine: Engine setup wizard shortcut no longer appears on desktop after installation.
  • PSCAD™: CONTROL_VDROOPTARGET Command ignores RELVAL= Arguments of other CONTROL Commands.
  • Plot: HBANDS= Argument draws horizontal bands in incorrect location for a falling change (no impact on calculation results).

v1.4.18​

Release date: 31 October 2024

New
  • Web App: Begun staged rollout of multiplayer mode - includes version tracking capability and hosted gridmo Project files.
  • Engine: Added PowerFactory interface to Engine settings configuration window.
  • Engine: Added 'Shared' folder to the Engine settings configuration window.
  • PSCAD™: Added new Commands CONTROL_VDROOPTARGET and CONTROL_PFTARGET for automatic calculation of Vref or PFref given a reactive power target. Often used when initialising PSCAD™ simulations without a PSS®E Static Node.
  • PSCAD™: OUTPUT Commands with identical TITLE= Arguments but different NAME= Arguments now supported.
  • PowerFactory Dynamic: OUTPUT Commands with identical VAL= Arguments but different NAME= Arguments now supported.
  • PowerFactory Static: Added a warning if the load Flow configuration is set to anything other than 20°C - as this may cause poor benchmarking with other software packages.
  • Web App: Added 'Low' priority simulation launch mode.
  • Web App: Overlay builder data can now be shared between machines using a special file (which can be imported and exported).
  • Web App: The tab of the Node that has a Flow Checker error now has an error icon - making it easier to find errors.
Improvements
  • Engine: Added click icon to Engine Simulation Summary and Analysis Summary.
  • Engine: File path validation Task now handles Linux-style file paths.
  • Engine: Renamed gridmo auto-generated Tasks (saving simulation JSON etc) in Engine simulation summary.
  • PSCAD™: Added 'does not have a definition' error to trigger an automatic retry (to handle rare OEM models missing definitions after being auto-reloaded in PSCAD™ 5.0.2).
  • PSCAD™: PSCAD™ firewall popup suppression improved - fewer firewall popups should now appear when running simulations with PSCAD™ Nodes.
  • PSCAD™: Speed improvements to PSCAD™ simulations and post processing.
  • PSCAD™: Released new version of smiby block:
    • Changed to integer version number - this release is v18.
    • Added positive, negative and zero sequence voltage and current output channels.
    • Fixed incorrect unit conversion on positive/negative reactive current (IQ) and positive/negative active reactive current (ID) output channels (was radians, should have been degrees).
    • Low SCR initialisation mode now on by default for new smiby blocks added to a workspace.
    • Added large resistances to prevent rare singularity error on SIMPLEFAULT and VDISTURBANCE Commands.
    • Pre-insertion resistance setting (for VDISTURBANCE) and distance factor setting (for all faults) was greyed out unless faults were enabled - now always available.
    • Replaced non-linear pre-insertion resistance mode (for VDISTURBANCE) with automatic snubber circuit which auto-calculates impedances required to achieve critical damping (based on the SCR), with a non-linear resistance ramp-out to prevent benchmarking mismatch during the disturbance.
    • Fixed inductive kickback experienced on some models with transmission line blocks (caused by VDISTURBANCE CB opening at any current incorrectly set to true, rather than a zero crossing).
  • PSS®E Static: Added VALSCALE= support to PSS®E Static's OUTPUT Command.
  • PowerFactory Static and PSS®E Static: Reduced excessive warnings when running static simulations and where a generator has hit a P or Q limiter - now a single warning is provided.
  • PowerFactory Static and PSS®E Static: Reduced sensitivity of the "Detected potential ATLINE= Argument is backwards" warning.
  • PowerFactory Static: Added VALSCALE= support to PowerFactory Static's OUTPUT Command.
  • PowerFactory Static: Now forces all new temporary line types which are auto-created (if the Zth branch is a line type) to have a maximum operating temperature 20°C.
  • Table: Configuration of a Table Node can now be imported and exported in CSV format.
  • Table: Standardised table column naming to be the same between single and multiple Internode Variable matches (was previously different).
  • Web App: Added additional filtering options to simulations view.
  • Web App: Engine Task scheduler now prioritises smaller Runs over longer Runs - helping you get plot results faster when running large simulations.
  • Web App: Expanded display of Plot Nodes in 'Apply subplot changes' dialogue - is now easier to identify which Plot Node is which.
  • Web App: Overlay builder now automatically ignores completely empty columns in the loaded CSV data.
  • Web App: Overlay builder now has zoom functionality (click and drag left-right to zoom in, magnifying glass to zoom out).
  • Web App: Simulation status view now includes as drop-down section to see simulation progress on a per-Run level.
  • Web App: Speed improvements to gridmo server simulation launch, simulation cancel and Task request functions.
Fixed
  • Documentation: Fixed a few small typos in the example Commands provided in the 'Reference' section of the docs.
  • Engine: Engine's Simulation Summary output file did not correctly override previous failed Tasks which successfully retried.
  • PSCAD™: smiby configuration files are created in the incorrect place if the PSCAD™ case file is inside a sub-directory compared to the location of the PSCAD™ workspace file.
  • PSS®E Static: If case file is modified to set impedances to Ohms mode, rather than per-unit mode, the Engine does not force it back to per-unit mode before setting impedances for SCR and XR changes.
  • Plot: DRAW_LINE Command when using SHADE_xxx=YES would not shade to infinity, would only shade a single unit in that direction.
  • Plot: Plot colour format error when a Plot Node is after a Loop:End Node and the Nodes within the loop do not have different descriptions per loop.
  • Plot: Plot error when ADVBANDS used and no transient events are specified (e.g. no TAT= arguments are present).
  • PowerFactory Dynamic: Fixed error if a dynamic simulation has both Vthev playback and either a SIMPLEFAULT and/or VDISTURBANCE Command.
  • PowerFactory Dynamic: When using frequency playback, the voltage playback model added by gridmo was using an incorrect reference bus voltage (was 1.00 pu, should have been the voltage at the start of the dynamic simulation) which could cause benchmarking issues.
  • PowerFactory Static and PowerFactory Dynamic: Fail to import Project error if a PowerFactory Project does not have an active study case when exported for use in gridmo.
  • Web App: Deleting Nodes on the Flow when the "Define subplots" tab of the Plot Node open can sometimes accidentally delete subplots.
  • Web App: Fixed placeholder text in Plot Node's subplot configuration window not matching current gridmo templates.
  • Web App: Fixed timing bug where a simulation could be cancelled while still processing, resulting in out-of-order simulation Tasks.
  • Web App: If changes made in a Node panel, then the file is downloaded with the Node panel still open, changes are saved even if 'Discard changes' was selected.
  • Web App: Pressing 'delete' when having the subplot configuration window open would result in a web-app error.
  • Web App: Undo snack bar incorrectly reported an undo action occurred when switching Flows.
  • Web App: Variable selector could (rarely) jump to the first index in the dropdown list.

v1.4.17.4​

Release date: 15 October 2024

New
  • PowerFactory Static and PowerFactory Dynamic: Can now benchmark between multiple versions of PowerFactory on the same Engine (for example PowerFactory 2023 vs PowerFactory 2024 on a single Plot from a single Engine).
Improvements
  • Engine: PSS®E34 Engine setup improvements. Improved detection of existing Python 2.7 installations, added missing refresh button on Python 2.7 detection page and fixed popup which had no text in the message box, was incorrectly only in the title.
  • Engine: Removed RAM load check from dynamic worker control (was causing dynamic workers to lower unnecessarily due to Windows SuperFetch).
  • Engine: Working folder now defaults to same location as installed Engine, no longer requires specification by the user.
Fixed
  • PowerFactory Dynamic: Error when VDISTURBANCE over-voltage Command and voltage playback used together due to PowerFactory load flow result before initial reference bus voltages were read.
  • PSS®E Dynamic: PSS®E34 ADVFAULT logic - fixed unstable network responses caused by islanded buses not being reclosed despite AR_FINALSTATE=IN (lines were being reclosed, but buses at both ends of the line were assumed to still be in service).
  • PSS®E Static: system.swingbus.ignorevolt Advanced Parameter was disabled in error as part of previous patch version, fixed logic, swing buses now back to previous functionality (swing buses are ignored for voltage check by default).

v1.4.17.3​

Release date: 11 October 2024

New
  • PSS®E Static and PSS®E Dynamic: Added PMAX=, PMIN=, QMAX=, QMIN= and MBASE= setting Arguments to SET Command.
  • Plot: Added DRAW_LINE Command to draw a line on a subplot with optional styling and shading.
  • Plot: Added SHADE_COLOR= Argument to all error band Commands and SETTLE_T, RISE_T, RECOVERY_T and COMMENCEMENT_T.
  • Plot: Added BAND_START_T= and BAND_END_T= Arguments to SIMPLEBANDS and DELTA_ERRORBANDS to allow error bands to be displayed on a subset of the channel time.
Improvements
  • Engine: Increase worker launch speed, reduced file size and reduced the time it takes for the Engine to launch.
  • PSCAD™: Temporary folders are now deleted/cleaned prior to launching a PSCAD™ simulation - to minimise potential errors on retrying PSCAD™ simulations.
  • PSS®E Static and PSS®E Dynamic: Now more robust under PSS®E model instability (e.g. NaN values in PSS®E .out files or NaN values in system mismatch values).
  • PSS®E Static: Static solver convergence speed increased, biggest change should be on very large PSS®E models.
Fixed
  • PSCAD™: PSCAD™ v4 could incorrectly appear in the Engine's setup wizard dropdown box, despite not being supported.
  • PSS®E Static and PSS®E Dynamic: Robosolve version check was only incorrectly checking PSS®E v35, not PSS®E v34 as intended.
  • Plot: Error band bounds (border lines) were still appearing on output plots, even when set to COLOR=white.

v1.4.17.2​

Release date: 3 October 2024

Improvements
  • Data: OUTPUT Command now supports LEGEND= Argument.
  • PSS®E Dynamic and PowerFactory Dynamic: Added new power system simulation warning if a SIMPLEFAULT calculates an impedance which is negative due to very low SCR or residual voltage very close to Vth.
  • PSS®E Dynamic, PowerFactory Dynamic and PSCAD™: Standardised minimum simulation time to 0.1 seconds.
  • PSS®E Dynamic: PROCESS=ANGLE_WRAP now supported for OUTPUT, GEN=, VAL=ANGLE Commands (e.g. rotor angle).
Fixed
  • Engine: LEGEND= Arguments are no longer automatically capitalised.
  • PSCAD™: Rare issue where PSCAD™/EMTDC™ data has corrupted values resulting in extremely large simulation summary file size.
  • PSS®E Static and PSS®E Dynamic: Standalone folder macro raises error on saving converged case.
  • PSS®E Static and PowerFactory Static: Duplicate call to static solver initialisation causing duplicate rows in standalone folder output scripts.
  • PSS®E Static: Converged case file not included in standalone folder.
  • PSS®E Static: Static solving Engine tries to use robust solution, even in PSS®E versions which don’t support it (v34.2 or older).
  • Plot: Series of errors if a plot is in manual x axis, with auto smart scaling on the y axis and there are no data points at all in the area to render.
  • Plot: TypeError when START_T= is less than END_T=/FAULT_CLEAR_T= in a SETTLE_T, RISE_T, COMMENCEMENT_T or RECOVERY_T Command.

v1.4.17.1​

Release date: 2 October 2024

Fixed
  • Plot: The colour specified in Engine setting colors.plot.grid ('Grid colour:' in settings page) no longer appears on the output plots, always defaults to light grey.

v1.4.17​

Release date: 1 October 2024

New
  • Engine: Added third desktop shortcut to the Engine's setup wizard as part of he Engine installer.
  • Engine: New Engine task is launched at the very beginning of all simulations which checks all file paths in all Nodes - helping simulations with errors fail early and fail fast.
  • Plot: Added image (PNG) file type output option.
  • Plot: Added new OP=DELTA argument to ADVOUTPUT Command.
  • Plot: Added portrait orientation option.
  • Plot: AT is now optional for OUTPUT Command. If AT is not provided, the outputted value will default to the end of data channel.
  • Plot: END_T is now optional for SETTLE_T, RISE_T, COMMENCEMENT_T and ADVOUTPUT Commands. If END_T is not provided, END_T= will default to the time at the end of the data channel.
  • Plot: Horizontal axis (x-axis) can now be logarithmic.
  • Plot: SIMPLEBANDS and DELTA_ERRORBANDS now support percent within bands export.
  • Plot: Secondary (right) y-axis now supports gridmo auto-scale.
  • Table: Major updates, added new table-style display, columns can be dragged to rearrange, etc.
  • Web App: Added organisation level functionality, new users in your organisation can be added by your administrator and Engines are now shared within your org.
  • Web App: Apply subplot changes popup window now displays plot title and plot subtitle in the configuration pane.
  • Web App: Internode Variables now auto-complete when the { key is pressed via a new dropdown.
  • Web App: Released Flow Checker.
  • Web App: Released Overlay Builder.
  • Web App: Resolved view resolves and checks for Internode Variables.
  • Web App: Status of your Engine is now displayed in the web-app.
  • Web App: Unsaved changes pop-up now appears if you try to close a tab (before the tab is closed).
  • Templates: Added Powerlink inverter based renewable plant GPS study requirements template.
Improvements
  • Plot: Released GIFs to show gridmo's calculation methodology for settling time, rise time and recovery time in the Plot Node docs.
  • Analysis: No longer raises an error on missing Internode Variables, now raises a warning instead.
  • Analysis: Updated Analysis Node output template, now a single page with enhanced filtering options.
  • Engine: Reduced maximum licence re-check time if lost internet connection (so Engines reconnect quicker if internet connection drops out).
  • PSCAD™: Plot-step is now automatically reduced if simulation length is 200 seconds or more - to prevent excessive temporary file generation and reduce memory usage when plotting.
  • Plot: ADVOUTPUT Command now supports DISPLAY= Argument (and has new cleaner legends and visual display).
  • Plot: Interactive HTML plots now have compression to reduce their file size.
  • Plot: The colour of rise, settle, recovery and commencement bands now align with the interactive HTML plots (were previously different).
  • Templates: Added synchronous generator test suite to Western Power GPS template.
  • Templates and Plot: STYLE, TYPE=5255IQ minimum access standard changed from +2%/-2% to +0%/-0% bands as per AEMC ERC0272.
  • Templates and Plot: STYLE, TYPE=5255IQ, TYPE=52511 and TYPE=52513 appearance updated to align with style of other plots generated by gridmo.
  • Web App: Simplified subplot configuration pop-up (second axis hidden by default, manual y-axis values only appears if manual selected).
Fixed
  • Analysis: Unexpected errors if a connected Node exports NaN (which indicates a failed calculation, such as a channel not settling).
  • Engine: Simulation and Analysis summary incorrectly displayed the Plot's title, rather than the Plot Node's title.
  • Engine: Simulation and Analysis summary would display duplicate results when the column's headers were clicked.
  • PSS®E Dynamic, PowerFactory Dynamic and PSCAD™: Playback data validator error is unclear if an invalid number is detected.
  • PSCAD™: Changes using SET, CIID= to an object within a linked library is applied, but not saved into the PSCAD™ standalone folder copy of the project.
  • Plot: EDGE, TYPE=FALLING subplot Command reported the final high channel value, rather than the first low channel value (off-by-one error).
  • Plot: NAME= argument is no longer mandatory for EDGE and OUTPUT Commands.
  • Plot: If an Internode Variable is present in a Plot Node's subplot Commands field, other than after an AT= Argument, a validation error is raised.
  • Plot: Interactive (HTML) plots no longer always display, instead they will match between the PDF and HTML plots for consistency.
  • Plot: Recovery time calculation can report immediate recovery if active power is initially negative (such as BESS charging scenarios).
  • Plot: Scatter plot GRADIENT Command's auto horizontal line section detection can occasionally - incorrectly - calculate the gradient of the horizontal line segment which should have been ignored.
  • Plot: Scatter plot GRADIENT Command's exported Internode Variable value (e.g. if NAME=i_gradient, where {{i_gradient}} was used) did not apply the specified INVERT= argument.
  • Plot: Scatter plot subtitles were not displayed in PDF output plots.
  • Plot: SETTLE_T and RISE_T Commands incorrectly filter the data to only the displayed x-axis range, rather than use all available data.
  • Plot: RISE_T Command HBANDS= Argument plotted horizontal lines with an incorrect vertical offset.
  • Plot: STYLE, TYPE=5255IQ Command had part of the green (AAS) area overlap the grey (MAS) area.
  • Plot: STYLE Commands did not apply correctly if there were a small number of points on the scatter plot.
  • PowerFactory Dynamic: Internode variables can be included in output data which were not recorded (e.g. a LVRT signal for an in service, but islanded, solar farm) causing errors in connected Nodes.
  • PowerFactory Dynamic: Relative voltage playback uses the wrong initial/reference voltage if the AC source uses an external load flow voltage controller.
  • PowerFactory Static and PowerFactory Dynamic: Models with lines connected as part of PowerFactory substations could not be auto-identified.
  • Web App: Control+Enter shortcut stopped working on the Launch pop-up.
  • Web App: Error caused by launching a simulation with a Loop Start Node which has no loops selected.
  • Web App: Internode Variables were incorrectly displayed as all lower case, despite being case sensitive.
  • Web App: Project title description's hint text did not align with gridmo's best practices page.
  • Web App: Simulation status snackbars overlap with the Flow configuration buttons.
  • Web App: Small fixes to web-app syntax highlighting (e.g. STATE= Argument was not highlighted).
  • Web App: Undo did not function in the web-app data grids (Global/Scenario Variables etc).

v1.4.16.6​

Release date: 3 September 2024

Improvements
  • PSCAD™: Improved handling of NaN values in PSCAD™ output files - the entire row was previously removed if any NaN values were present which could cause plots to appear empty.

v1.4.16.5​

Release date: 2 September 2024

New
  • PSCAD™: Added support for ENI/PNI projects (multiple PSCAD™ case files connected via transmission lines), added new engine setting to enable this mode.

v1.4.16.4​

Release date: 19 August 2024

Fixed
  • PSS®E Static: Fixed issue in calculation methodology for PSS®E OUTPUT, VAL=TAPRATIO Command to ensure it uses the ratio of the highest voltage winding only with the assumption that tap changers are on the HV winding.
  • PSS®E Dynamic: Fixed issue in SIMPLEFAULT, MULTIFAULT and VDISTURBANCE where the X/R ratio of the disturbance was not correctly chosen. The default X/R ratio of the fault was that of the Thevenin equivalent source impedance, rather than 3.
  • PSS®E Dynamic: Fixed issue in ADVFAULT where FZ= was required in p.u. on Zbase, but the docs states that it was required in ohms. Command has been aligned with docs.
  • PowerFactory Dynamic: Fixed issue in SIMPLEFAULT and VDISTURBANCE where the X/R ratio of the disturbance was not correctly chosen. The default X/R ratio of the fault was that of the Thevenin equivalent source impedance, rather than 3.
Improvements
  • PSS®E Static: Expanded SET, TX=, STATUS= to now support direct control of the tap position in PSS®E.
  • PSS®E Dynamic: Expanded SIMPLEFAULT Command to include TYPE= for different fault types.

v1.4.16.3​

Release date: 10 August 2024

Improvements
  • PSS®E Dynamic: Expanded OUTPUT, GEN= Command to include all machine array channels.

v1.4.16.2​

Release date: 2 August 2024

New
  • PSS®E Static: SET, BUS=, STATUS= now supports direct control of bus type code in PSS®E (e.g. STATUS=2 means set the bus to a generator type).
Improvements
  • Engine: Improved warning text on Engine's 'Errors & Warnings' view to better explain the cause of a retryable error.
Fixed
  • Engine: A Task which fails due to a retryable error does not create a standalone folder, though one should be made.

v1.4.16.1​

Release date: 1 August 2024

Fixed
  • Engine: Simulation summary does not display task status if scenario variables are used and scenario 1 is not present in the simulation, scenario variable filter (top left) occasionally does not render in numerical order and the Saving Simulation JSON task does not appear if scenarios are active.

v1.4.16​

Release date: 31 July 2024

New
  • PSS®E Dynamic: Added Vref and Gref output channel support using VAL=Vref and VAL=Gref.
  • Templates: Released National Grid ESO System Oscillation (PSCAD™) study template.
  • Web App and Documentation: Added gridmo Command syntax highlighting throughout the web-app and docs.
  • Web App: Added resolved view - you can now see the variables and the find-replace view at the same time.
  • Web App: Global Variables table now has syntax highlighting and support icons/links (expand view, docs link etc).
  • Web App: The Global Variables used in gridmo templates are now reserved (cannot be changed) to prevent accidental delete/change errors.
Improvements
  • Data: Automatically removes rows and columns which are completely empty from .csv data.
  • Documentation: Updated order of Arguments for all Commands to better match templates and general use cases.
  • Engine: New simulation summary page, with easier filtering to identify warnings and errors in your simulations quicker.
  • PSS®E Static: Console printing of a branch no longer being a non-zero impedance line is now suppressed.
  • PSS®E Static: Revised calculation methodology for PSS®E OUTPUT, VAL=TAPRATIO - now uses the ratio of the highest voltage winding only with the assumption that tap changers are on the HV winding.
  • Templates: Released new Global Variable descriptions and default order - now easier to understand.
  • Templates: Updates to example WECC-SOLAR PV model to align with revised template descriptions.
  • Web App: Added 'view' button into bottom right simulation status display.
  • Web App: Added loading screen while uploading Projects.
  • Web App: Increased maximum length of data Node's relative file path field.
  • Web App: Simplified log options under 'Advanced' tab in simulation launch popup.
Fixed
  • Engine: Cancelled Tasks are set to an error state in the simulation summary file, but no info is provided to hint that they were cancelled Tasks.
  • Engine: Changelog URLs in Engine Updater are incorrect.
  • PSCAD™: Comments in PSCAD™ grid control field (voltage, frequency or angle playback) raise unexpected invalid content error.
  • PSCAD™: Component ID search (CIID=) does not search libraries inside a PSCAD™ workspace, only case files.
  • PSCAD™: Simulation can end one plot step too early (e.g. at 34.999 rather than 35 seconds) which causes unnecessary warnings in connected Plot Nodes.
  • PSS®E Dynamic: Duplicate time-step values created when simulation pauses to apply a gridmo Command, or clear a power system fault - the duplicates are now automatically removed.
  • PSS®E Static and PSS®E Dynamic: PSS®E standalone folder scripts were suppressing all PSS®E log content after running, is now reset to log to GUI console.
  • PSS®E Static: PSS®E auto-merge of SMIB into network model only checks the source (network) model for an available bus number, now checks both models for a unique number.
  • PowerFactory Dynamic: OUTPUT Commands for channel (e.g. voltage, active/reactive power etc) does not display an error if the specified BUS= or GEN= is not present in the model.
  • PowerFactory Static: gridmo no longer overrides a generator's static voltage controller and static angle controller if a CONTROL, GEN= Command is not present in the Actions for this Node.
  • Web App: Advanced Parameter distance factor unexpectedly set to 1.0 regardless of web-app setting.
  • Web App: Global Variable names can incorrectly have multiple lines.
  • Web App: Global Variables or Scenario Variables with blank/empty names can be uploaded using Excel CSV import.
  • Web App: 'New value' is the default value for a new Scenario Variable, where it should be blank.
  • Web App: Node search requires a page refresh after switching Flows before finding new results.
  • Web App: Rare web-app crash when editing subplots (under limited scenarios).
  • Web App: Simulations can fail to launch correctly if a double quote is present in a PSCAD™ Commands field.

v1.4.15.6​

Release date: 24 July 2024

Fixed
  • Plot: RECOVERY_T command incorrectly states an immediate recovery if the initial value is negative, with a positive step change.
  • Plot: Fixed inconsistency where an Engine option was not showing text in the .html plot output - but it was appearing in the .pdf plot output file.

v1.4.15.5​

Release date: 11 July 2024

Fixed
  • PSS®E Dynamic: CONTROL, VREF= and CONTROL, GREF= raise an unexpected validation error when a relative change is specified (e.g. VREF=+0.03 p.u.).

v1.4.15.4​

Release date: 10 July 2024

Fixed
  • PSS®E Dynamic: CONTROL, VREF= and CONTROL, GREF= relative change commands do not pass the correct bus reference to PSS®E, do not apply VALSCALE= when provided and raise an unexpected error if p.u. is specified in all capitals.

v1.4.15.3​

Release date: 8 July 2024

New
  • Plot: Added DELTA_ERRORBANDS which creates an error band based on the relative change in a single, with an optional scaling factor.

v1.4.15.2​

Release date: 5 July 2024

Fixed
  • Engine: Fixed validation error being raised when using very small or large numbers for VALSCALE= arguments.

v1.4.15.1​

Release date: 22 June 2024

Fixed
  • PSS®E Static: Case converged check does not re-check model convergence after robust solution solve - but will only check after next non-robust solution check.
  • PSS®E Static: system.convergence.mva Advanced Parameter incorrectly has a maximum limit of 5 MVA.

v1.4.15​

Release date: 20 June 2024

New
  • Documentation: Released examples for initializing PSCAD™ from static simulations, advanced network faults and benchmarking models with real-world data.
  • Engine and Web App: Detects common intermittent errors and automatically reschedules the failed Task to retry.
  • PSS®E Static and Web App: Expanded network model reference to support model exported by a connected PSS®E Static Node (allowing multi-SMIB merge support).
  • Web App: Global Variables can now contain Scenario Variables, Global Variables can now contain other Global Variables and Scenario Variables can now contain other Scenario Variables (but cyclical references are not supported and will be raised as an error).
  • Web App: Scenario Variables which are identical are now automatically converted to Global Variables.
Improvements
  • PSS®E Dynamic: Added new Argument AR_INDEPENDENT_TIMERS to enable simulation of (fictitious) time-synchronised auto-reclose timers.
  • PowerFactory Dynamic: Added a warning if multiple potential Thévenin equivalent sources are detected (which means faults or voltage playback may not work as expected).
  • Web App: Added validation checks to ensure that variable names are unique across Global Variables and Scenario Variables.
  • Web App: An enable/disable column is now exported by default for all Loop Variable .csv exports.
  • Web App: Global Variables now support multiple lines.
  • Web App: Moved "Run only first iteration of each loop" check-button out of the "Advanced" section in the "Launch a Simulation" popup.
  • Web App: Scenario Variable table now has a drop-down selectable number of Scenario Variables, rather than showing all by default.
  • Web App: Switching between Node configuration windows now selects the same tab by default.
  • Web App: When exporting to .csv, all rows are now exported from a Start Loop Node, regardless if a subset is selected.
Fixed
  • PSS®E Static: When network merge is enabled, source network case file is not automatically added into the standalone folder.
  • PowerFactory Dynamic: Rarely, multiple gridmo Results objects can be created.
  • Web App: Fixed 'already signed in user' error when signing in.
  • Web App: Fixed rare 'An unknown error has occurred' bug on signing in.
  • Web App: Percentage complete of extremely large simulations can report 100% complete (but they are not yet complete).
  • Web App: Simulations no longer get stuck in Backlog state if an unexpected error is encountered while processing.
  • Web App: Simulations no longer raise an error when switching from a very large flow to a small one (where the project file itself is very large).
  • Web App: Start Node incorrectly had an icon implying it has a Node configuration window (but it doesn’t).
  • Web App: Fixed issue where users couldn't switch between Flows in large project files.

v1.4.14​

Release date: 29 May 2024

New
  • Documentation: Restructure and redesign of docs.gridmo.io.
  • Templates: New template released - WEM GPS (PowerFactory and PSCAD™).
  • Web App: New user interface with clearer Node panels, more Flow space, fewer tabs and standardised look and feel throughout the app.
Improvements
  • Engine: Added local launch buffer to improve PowerFactory simulation launch speed.
  • Engine: Required Python 2.7 dependencies now packaged with Engine for PSS®E v34 support.
  • Engine: Standalone zip folder name and gridmo log files now include additional information on the source Node and source Run to assist debugging.
  • PSCAD™: Added option to allow PSCAD™ workspace pre-processing to be skipped (to support some OEM models).
  • PSS®E Dynamic, PSCAD™ and PowerFactory Dynamic: Improved validation and error description for invalid playback (V / F / angle) instructions.
Fixed
  • PowerFactory Dynamic: CONTROL, RELVAL= and VDISTURBANCE do not apply the desired event in PowerFactory 2023 (though do appear in the standalone folder .pfd) - added parameter event pre-allocation.
  • PowerFactory Dynamic: gridmo V/F playback dynamic model is in .dz format, not .pfd format and is not backward compatible with PowerFactory 2023.
  • Table: Output file can be created even if no filename specified.
  • Web App: Old very large Node IDs are now mapped to smaller values to avoid overlapping text on output plots.
  • Web App: Start Nodes have unexpected Node panels appearing if double clicking.

v1.4.13.4​

Release date: 21 May 2024

New
  • PowerFactory Dynamic: Added RELVAL= support for CONTROL Command.
  • PowerFactory Dynamic: Added VAL=IQ, VAL=ID and VAL=PF for OUTPUT Command.
  • PowerFactory Dynamic: Added VDISTURBANCE support for both under and over voltages.
  • PowerFactory Dynamic: Added generic OUTPUT channel recording support (such as LVRT/HVRT signals etc).
  • PowerFactory Dynamic: CONTROL Command now supports pre-initialisation with AT=-1.
  • PowerFactory Dynamic: Renamed MODEL= to OBJECT_NAME= to better align with PowerFactory definitions.
  • PowerFactory Dynamic: Two and three winding transformers now supported for OUTPUT Commands.
  • PowerFactory Static: Added SET, OBJECT_NAME= and SET, FOREIGN_KEY= to allow gridmo to control load Flow controllers or similar objects.
Fixed
  • PSCAD™ and PowerFactory Dynamic: SETFILE now supports non-numeric parameter settings (as per the documentation).
  • PowerFactory Dynamic: Improved angle benchmarking between PowerFactory and other packages (PowerFactory angle now regulated to reference bus by default).
  • PowerFactory Dynamic: METERBUS= Argument raises unexpected validation error for OUTPUT Commands.
  • PowerFactory Dynamic: VALSCALE= is not processed for OUTPUT, BUS= Command.

v1.4.13.3​

Release date: 19 May 2024

Fixed
  • PSCAD™: Engine setup wizard does not store direct (EMTDC™) launch configuration details if any PSCAD™ Fortran compiler fails to launch - rather than disabling only the failed compiler configuration.

v1.4.13.2​

Release date: 13 May 2024

Fixed
  • PSCAD™: smiby's automatic infinite bus voltage not used to bias relative voltage steps.
  • PSCAD™: smiby's automatic infinite bus voltage mode incorrectly applies a fixed ramp rate to all subsequent voltage changes in a simulation.

v1.4.13.1​

Release date: 10 May 2024

New
  • PSS®E Dynamic: Added new Argument AR_CLOSE_ONE_END to ADVFAULT Command. The default auto-reclose performance of ADVFAULT now simulates dead-line auto-reclose blocking (which is common on many transmission reclose schemes) to improve alignment to real-world fault events. Previous performance can be selected using AR_CLOSE_ONE_END=NO.
Fixed
  • PSS®E Dynamic: ADVFAULT Command incorrectly raises an error if AR_RETRIES=1.
  • PSS®E Dynamic: ADVFAULT Command incorrectly switches the second line section out if the line trip timers overlap (during a auto-reclose attempt with the fault still present).
  • PSS®E Dynamic: The faulted line after an ADVFAULT Command is always out of service at the end of the fault and reclose sequence, even if AR_FINALSTATE=IN Argument is specified.
  • Web App: Fixed unnecessary duplication of data in file storage causing JSONs to be larger than required.
  • Web App: Fixed Analysis Node table issue where "Name" column was not editable when selected.
  • Web App: Fixed issue where Loop: Start Node inserted a trailing newline when the user pressed 'Enter' to go to the next line.

v1.4.13​

Release date: 7 May 2024

New
  • Web App: JSON files can now support multiple Flows within a single project.
  • Web App: Loop Variables can now support multiple lines.
  • Engine: Example CSV data now provided with the Engine installer for future gridmo example files.
  • Engine: New gridmo Engine updater icon added.
  • PSCAD™: smiby block now has automatic infinite bus voltage calculation capability.
  • PSS®E Static and PowerFactory Static: New Advanced Parameter voltages.tolerance to allow independent control from MVA targets for all static simulations.
Improvements
  • Engine: Setup wizard now ignores all FortranMedic versions which are not PSCAD™ v5 and has improved error handling in case it does not launch correctly.
  • Engine: Simplified Engine setup process by combining licence key and connectivity checks into one step.
  • PSCAD™: Direct (EMTDC™) launch mode is now disabled by default, but still set up during the Engine setup process.
  • PSCAD™: Output file search improved to better handle PSCAD™ installations which do not correctly report the EMTDC™ temporary directory to the Engine.
  • PSCAD™: SET, CNAME= Command improved, now checks all matches and only tries to apply to PSCAD™ objects which match both the name and the parameter.
  • PSS®E Static and PSS®E Dynamic: SET Command now supports multiple GEN= Arguments.
  • PowerFactory Dynamic: CONTROL Command improvements to handle multiple MODEL= Argument results and only apply if a matching parameter is found.
  • PowerFactory Static and PowerFactory Dynamic: Expanded error handling for PowerFactory error codes due to missing licence, or too many windows open.
  • Templates: Added Related Templates references to templates in the template library.
  • Web App: Title of web-app tab now lists the name of the currently opened Project.
Fixed
  • Analysis: Analysis summary doesn't appear for any Analysis Nodes which have blank titles.
  • Data: Error raised if time series channel not auto-detected by the Engine.
  • Engine: In the setup wizard, the Engine ID box and instructions are not hidden as expected when pressing the retry button.
  • PSCAD™: Output file conversion can fail to convert a single channel from EMTDC™ into gridmo's standard format due to an off-by-one error.
  • PSCAD™: Output file reader now supports PSCAD™ Project description (which is added as a header to the output files made by EMTDC™).
  • PSS®E Static and PSS®E Dynamic: Automated island disconnection can raise an unexpected error based on PSS®E's response code.
  • PSS®E Static and PSS®E Dynamic: If PSS®E legacy connection timeout is changed in the Engine settings window and settings are applied without restarting, PSS®E legacy launch mode does not start correctly.
  • Plot: Scatter plots can raise a rare Unbound Local error if a customer logo is specified.
  • PowerFactory Dynamic: OUTPUT, GEN= Command not adding output channel as expected.
  • PowerFactory Dynamic: Removed default text placed in description field of all dynamic simulations.
  • PowerFactory Dynamic: VALSCALE= argument not being applied in PowerFactory CONTROL Commands.
  • Templates: Some sticky notes have NOTE: appended before TEMPLATE: in some templates.
  • Web App: If a Node window is open with unsaved changes, a warning for unsaved changes when you download a Flow is not displayed.
  • Web App: Variable auto-complete functionality doesn't exist on any text fields in Analysis Nodes.
  • Web App: When you are copying and pasting Loop variables, the Node copy and paste is not suppressed.

v1.4.12.2​

Release date: 2 May 2024

New
  • PSS®E Dynamic: Added CONTROL, VAR=, CONTROL, CON=, CONTROL, ICON=, OUTPUT, VAR= and OUTPUT, STATE= support for miscellaneous (other) type PSS®E dynamic models using new MINS= argument.

v1.4.12.1​

Release date: 17 April 2024

Fixed
  • Web App: Fixed issue causing blurry text on some monitor resolutions.

v1.4.12​

Release date: 15 April 2024

New
  • Web App and Engine: Released PowerFactory Static and PowerFactory Dynamic Nodes and associated documentation.
  • Web App: New button added which can apply subplot changes across multiple Plot Nodes within a Flow.
  • Templates: New template library, with dedicated search, setup instructions, assumptions, sources and template-level changelog.
  • Plot: Added commencement time as a sub-plot level calculation using the Command COMMENCEMENT_T.
  • smiby: Expanded PSCAD™ model low-SCR initialisation mode options. New modes include infinite bus voltage ramps, and infinite bus voltage and SCR ramps.
  • Templates: Public release of AEMO typical Chapter 5 NER GPS template.
  • Templates: Public release of ERCOT DWG dynamic Model Quality Tests (MQT) v20.
  • Templates: Public release of Australia Essential Energy <5 MW typical dynamic network studies requirements.
  • Templates: Public release of Australia Powercor Sub 5 MW GPS Guideline.
  • Templates: Public release of Fingrid Modelling instruction for PSS/E and PSCAD™ models & VJV2018.
  • Templates: Public release of Australia AusNet Services 1.5MW to 5MW System Study Requirements.
  • Templates: Released new combined Table 22 and Full AEMO DMAT template (which replaces older separate templates).
  • Templates: Standardised layout and structure of all gridmo templates, finished implementing new standardised sticky Node arrangement.
Improvements
  • Engine: Added Engine version reporting into gridmo worker log file.
  • Engine: Prevented multiple message boxes from being opened when trying to close the Engine settings window.
  • PSS®E Static and PSS®E Dynamic: Extended default timeout from 120 to 240 seconds for legacy PSS®E v34 connection mode.
  • Plot: Added new Engine setting to allow top-right gridmo logo to be toggled off.
  • Plot: Changed to new powered by gridmo logo on plots and added powered by gridmo to bottom right of plots.
  • Web App: Improved error message when accidentally uploading a Scenario Variables CSV to the Global Variables table, or vice-versa.
Fixed
  • Engine: Rare Engine thread crash issue (added better error handling to display this state).
  • Engine: ValueError '' not in list caused by a PSS®E Static Node being connected to a Table Node which is then plotted in scatter Plot Node.
  • Engine: Settings window can be very slow when opened.
  • Engine: Setup wizard can fail with a FileNotFound error is PSCAD™ setup only completed.
  • PSS®E Static: Convergence target of low.scr.mode is too large by default, resulting in some SCR misalignment under extremely low SCR.
  • Web App: Rarely, when re-arranging sub-plots, some sub-plots can be stacked on-top of each other if moving multiple sub-plots.
  • Web App: Stopped undo snapshots from being from being created when clicking or double clicking on Nodes.
  • Analysis: Analysis Outputs could occassionally render with the incorrect font if the Engine's preferred font was unavailable.

v1.4.11.3​

Release date: 8 April 2024

New
  • Plot: Added initial support for x-axis of plots to be logarithmic, rather than linear (will be added to Web App in a future release).

v1.4.11.2​

Release date: 24 March 2024

New
  • PSS®E Dynamic: Added new Engine setting for user configuration of the timeout setting for PSS®E v34 legacy connection mode, default value remains unchanged and is suitable for most users.

v1.4.11.1​

Release date: 22 March 2024

Fixed
  • Plot and Web App: Rarely, some sub-plots don't render in the PDF output files, or do render but appear in the top-left of the Plot output, which doesn't align with the location specified in the Node configuration window.

v1.4.11​

Release date: 20 March 2024

New
  • Engine: ADVBANDS and SIMPLEBANDS output is now displayed on the Plotly HTML Outputs.
  • Engine: Added close and discard changes button to Engine's settings window.
  • Engine: Added support for Australian NEM's CONL parameters using new Advanced Parameter aus.nem.conl.
  • Templates: New template added - Australia Essential Energy <5 MW typical dynamic network studies requirements - now available to gridmo customers.
  • Templates: New template added - Australia Powercor Sub 5 MW GPS Guideline - now available to gridmo customers.
  • Templates: New template added - Fingrid Modelling instruction for PSS/E and PSCAD™ models & VJV2018 - now available to gridmo customers.
  • Web App: Added an auto-complete style dropdown to select Global, Scenario and Loop Variables when you type $.
  • Web App: Added new shortcuts, Control+E to enable a Node, Control+D to disable a Node, Control+S for saving the Flow (same as pressing the download Project button).
  • Web App: Added the ability to copy and paste sub-plots between subplot Nodes.
  • Web App: Added undo and redo buttons and shortcuts (Control+Z and Control+Y).
  • Web App: Flow viewport now auto-scrolls to the Node you have selected, including when searching.
  • Web App: Added Select all Nodes of this type to Flow right-click menu.
  • Web App: Add Node menu now stays open to allow you to add multiple Nodes at a time.
  • Web App: Released gridmo uptime monitoring and status page, added status indicator to bottom of web-app.
  • Web App: Validation of Node configuration fields added.
Improvements
  • Documentation: Clarified in the Data Node documentation that auto-align should be completed on the channel with the biggest change(s).
  • Engine: Now provides status message updates when gridmo Engine updating with a large number of cache records to check.
  • PSS®E Dynamic and PSCAD™: Standardised power factor definition, added extra handling for indeterminate cases (0/0) and updated smiby block with new power factor logic.
  • Templates: AEMO DMAT improvements - added a note saying a 300 second Run is required for tests 0.1-0.3 prior to submission, shortened plot subtitles to avoid clashing with customer logos.
  • Templates: AEMO GPS improvements - fixed missing Internode Variable i_v_poc_settling_time_2 error, added S5.2.5.1 constrained capability Start Node, corrected some minor typos, split start Nodes into SMIB and Network sections, corrected plot title of S5.2.5.7 (said S5.2.5.14), upgraded to new sticky Node structure for comments.
  • Templates: Model setup template improvements - added a fault and analysis Node to check for correct FRT/PPC freeze flag performance.
  • Web App: Global and Scenario Variable export files now have the variable type as a prefix, to make them easier to find.
Fixed
  • Documentation: Advanced Parameter sim.repeat.init.if.suspect was not added to the docs when released.
  • Engine and PSS®E Static: PSS®E 34 API timeout error only raises on launching of the legacy connection mode, not ongoing.
  • Engine and PSS®E Static: Reset the minimum acceptable limit back to 50 for max_iter Advanced Parameter, default remains at 500.
  • Engine: Error caused by running first loops with a scatter plot with a GRADIENT Command.
  • Engine: Rare duplicate Argument warning when Arguments don't appear to be duplicate, due to duplicates of other Argument values within the Command.
  • PSS®E Dynamic: and Web App: Grey descriptive text reworded to hint that a directory can be passed to load all dyre files in a directory.
  • Web App and Plot: Disabled extra lines from being added to subtitle field.
  • Web App, PSS®E Dynamic and PSCAD™: No character limit in Distance Factor field.
  • Web App: Control+C and right-click copy occasionally override each other, resulting in different Nodes pasted than expected.
  • Web App: Rarely, the Edges of the source for a Node copy is deleted when the group of Nodes is pasted, then immediately deleted.
  • Web App: If you search a Node, then scroll away in the Flow tab, then press Enter again the search does not move back to the original Node location.
  • Web App: Prevented rare Node self-Edges on thin Nodes, such as Loop End, causing Simulation launch errors.

v1.4.10.4​

Release date: 16 March 2024

Improvements
  • PSS®E Dynamic: Improved PSS®E merge algorithm to slowly ramp voltage and angle between value solved in SMIB and target value in network model to minimise PSS®E case convergence errors.

v1.4.10.3​

Release date: 14 March 2024

Improvements
  • PSS®E Dynamic: Added new advanced parameter ignore.generators.without.dyre to supress errors from being raised if a generator does not have a dynamic model.
  • PSS®E Dynamic: Added new advanced parameter run.chunk.time to allow PSS®E dynamic to be completed in smaller time chunks.

v1.4.10.2​

Release date: 11 March 2024

Improvements
  • PSS®E Static: Greatly increased the Advanced Parameter max_iter min and max limit (was 50-250 and now 500-10,000) to extend support for very low SCR cases. Default maximum iteration number increased from 100 to 500.
Fixed
  • PSS®E Static: CONTROL, VTARGET= Command raises unexpected VTARGET value is likely to prevent PSSE from converging error when a generator is at its maximum or minimum reactive power limit, instead of converging at limit.
  • PSS®E Static: Generator's maximum and minimum reactive power limits were not reset to their original pre-solved values after completion of a SOLVE Command and a CONTROL, VTARGET Command.

v1.4.10.1​

Release date: 3 March 2024

New
  • PSS®E Dynamic: Added new Engine setting. Can now specify the order to load dynamic libraries (.dll) between no order, file size order (smallest first) and alphabetical order.
Fixed
  • PSS®E Dynamic: Relative angle Command assumes slack bus generator ID is always '1'.
  • PSS®E Dynamic: If sim.relative.angles=no, no PSS®E Command should be called at all (existing makes a call to disable relative angle measurement, even though it's disabled by default).

v1.4.10​

Release date: 22 February 2024

New
  • Web App: Added the ability to launch a subset of Runs from the launch simulation window.
  • Engine: Added gridmo licence expiry date to the footer of the Engine.
  • Data: Added manual alignment capability to data Node - you can now specific a time to map an index in your data to a time value in a dynamic simulation.
  • Web App: Added copy (Ctrl+C) and paste (Ctrl+V) shortcuts to copying Nodes in the Web App.
Improvements
  • Web App: Major improvements to Loop Start Node - added in-app table, CSV import/export capability and the ability to enable/disable individual loop iterations.
  • Web App: Major improvement to subplot configuration - subplots can now be rearranged using drag/drop and configuring the number of pages, rows and columns is streamlined.
  • Analysis: The output generated by the Engine now auto-sorts to the same order as the analysis equations are displayed in the Web App.
  • Data: Data stand-alone folder now includes a copy of the input data in CSV format.
  • Engine: Reduced excessive output window text when deleting temporary working files in the gridmo Engine Updater.
  • PSCAD™: Added warning to indicate that a PSCAD™ model from a stand-alone folder should not be sent through the Engine again, as it may cause missing channel errors.
  • PSCAD™: Firewall auto-close popup improved to try to close all copies of the popup, rather than only the one the parent Task spawned.
  • PSCAD™: Reduced sensitivity of manual intervention required to close PSCAD™ warning.
  • PSS®E Static: Erroneous limiter warning in first iteration of gridmo's PSS®E Static solver.
  • Web App: Improved validation on simulation launch button, now will prevent launching if Engine ID field is empty.
  • Web App: Made Nodes in the Web App easier to connect (increased radius of successful connection area).
  • Web App: Node paste in Web App now pastes at the location of the right click.
  • Web App: Placeholder text changes to minimise confusion between example text and actual setting in a Node window.
  • Web App: Substantially reduced gridmo Project JSON file size.
Fixed
  • Analysis: Fixed analysis Node summary incorrectly reporting the wrong result if there are no Internode Variables in the equation.
  • Data: Fixed rare zero slice error when auto-aligning large data sets when performing downscaling for HTML export.
  • Engine: Fixed PSS®E version search timer in the Engine Setup Wizard from being too short, causing a failure to detect some PSS®E installations.
  • Engine: Fixed typo in Engine version footer hyperlink.
  • PSS®E Dynamic: SET, AT= Command incorrectly raising an unknown Command error.
  • PSS®E Static: ExtrError when trying to auto-merge a PSS®E SMIB model into a network model if there is no slack bus present in the SMIB model.
  • PSS®E Static: Temporary buses used for merging are now automatically deleted after successful merging of a SMIB case into a PSS®E network model.
  • Plot: Error when smart auto-scale attempts to auto-scale an empty sub-plot when a Data Node channel is present.
  • Plot: Fixed rare colour mismatch between PDF Outputs and HTML interactive Outputs due to floating point precision bug.
  • Plot: Minimised overlapping of multiple data legends when >10 OUTPUT Commands are used in a single Plot Node (in HTML interactive output).
  • Plot: Plot Node validation does not raise a validation error if the x-axis xmin time series value is invalid.
  • Plot: Removed standalone folder reference from interactive HTML footer if the channel source doesn't appear on any sub-plots in the output.
  • Web App: Fixed difference in sticky note Node width compared to other Nodes (in Google Chrome).
  • Web App: Fixed crash when deleting a Node that is currently open.
  • Web App: Node changes are no longer lost when switching between tabs.

v1.4.9.3​

Release date: 20 February 2024

New
  • Engine: Added new Engine settings, now allows custom colours for SIMPLEBANDS and ADVBANDS error band shaded area, upper band colour and lower band colour.

v1.4.9.2​

Release date: 19 February 2024

Fixed
  • PSS®E Dynamic: CONTROL, BUS= commands not correctly applied during dynamic simulations, if the user defined model is of type USRBUS (in the dyre file).

v1.4.9.1​

Release date: 6 February 2024

New
  • Engine: Added new Engine setting, allowing the plot channel priority order (e.g. PSCAD™ before PSS®E) to be specified.
  • Engine: Minor improvement to Engine's new version display text to support new Engine patch capability.
Improvements
  • Data: Added high resolution mode for auto-aligning longer data sets with simulation channels.
  • PSS®E Dynamic: Now supports folder paths in SMIB dynamic data record and network dynamic data record fields which will add all *.dyr files in a specified directory.
  • Engine licencing system: Altered dependency on 3rd party company due to their outages.
Fixed
  • Engine: Engine updater incorrectly deleted cache record, even if caches are valid.
  • Engine: PSCAD™ worker did not save the gridmo_worker log file in the all-temp folder.
  • Engine: PSCAD™ worker did not suppress EMTDC Windows firewall popup on latest version of Windows 11.

v1.4.9​

Release date: 30 January 2024

New
  • Data: Added optional VAL= Argument to improve gridmo auto-scaling of Plot Outputs.
  • Engine: Added Engine settings window - allows configuration of most Engine settings including default software versions and plot colours.
  • Engine: Added a new version available indicator on the Engine.
  • Engine: Added new Shared directory to enhance multi-Engine support.
  • Web App: Moved to a new Web App login page and master template.
  • Web App: Added a new expand button ⤢ to multiline fields in the Node configuration window - which expands the text box to cover the entire screen.
Improvements
  • Data: COL= Argument improved to accept additional characters, renaming columns of data extracted from Elspec PQMs no longer required.
  • Data: Expanded details on how the OUTPUT and auto-align function works in the docs.
  • Engine: Major improvements to Engine setup wizard, PSS®E and PSCAD™ auto-detection improved, removed unnecessary steps.
  • Engine: Simplified update process - added new Engine post-update automated process. Engine setup wizard isn't required to Run after every update any more.
  • Engine: Tasks now auto-delete their temporary files from the Working folder.
  • Engine: Time to complete an Engine shutdown is greatly reduced.
  • Plot: Interactive HTML plots now use the same colours for multiple lines on a single subplot as the PDF plots.
  • Templates: Redesigned template T000 - purpose of template is now to help you set up a new power systems model with gridmo.
  • Web App: Default value for new Global Variable or Scenario Variable now blank, was previously "New value".
  • Web App: Greatly increased performance of Web App when using large templates.
  • Web App: Greatly reduced loading time when switching between the Projects display and the Home tab (now called Simulations).
  • Web App: Scenario Variables now display with extra whitespace between rows - to highlight the difference between a single long Command and multiple Commands.
  • Web App: Simulation status table now automatically adjusts column widths to fit on screen.
  • Web App: Upgraded all Web App components to have a consistent theme, font, sizing and look.
Fixed
  • Engine: Case sensitive Argument values, such as NAME=xxx or DYRMODEL=xxx were incorrectly capitalised if the Argument was not all capital letters.
  • Engine: Rare Engine failure where the Engine reports Connected but is no longer requesting or starting new Tasks.
  • Engine: Setup wizard incorrectly deletes Engine setting min.spare.hard.drive.space.gb.
  • Engine: Very small or very large Internode Variable values can export in scientific notation, raising unexpected validation error.
  • PSCAD™: If a CONTROL, RELVAL= Command is used and there is no prior CONTROL, AT=0, VAL= Argument, smiby incorrectly defaults to an initial value of 0, rather than the smiby default value.
  • PSCAD™: If smiby block is named smiby_1 or similar, the Engine both reports a warning that smiby is incorrectly named but then raises error regardless.
  • Plot: ADVBANDS Command does not raise a validation error if BASE= Argument is not provided.
  • Plot: Any data Node on an interactive plot's standalone folder link does not render correctly.
  • Plot: Disabled 'binary' sub-plot option in Plot Node, as not currently available.
  • Plot: Unclear error raised if ADVBANDS Command has a TAT= Argument with a time which is after the end of the loaded data.
  • Plot: When using dual axis displays (left hand side and right hand side) the colours selected are identical, but should be different.
  • Templates: Australian NEM GPS (T006) S5.2.5.3 PSS®E Static Nodes have different initial voltage initialisation conditions between the actual test and generating the plot of the applied test.
  • Templates: Australian NEM GPS (T006) S5.2.5.4 Node 1368 (PSS®E Dynamic) has incorrect title.
  • Templates: SSIAG V2.1 (T002) plot subtitle characters cut off when describing SCR and XR.
  • Web App and Plot To edit any fields in the Plot Node's sub-plot dialog window, two clicks are required prior to editing being enabled.
  • Web App and analysis Import from CSV occasionally does not update content for data tables (including Global and Scenario Variables).
  • Web App, PSS®E Dynamic and PSCAD™ slightly increased max numbers of characters in the Description field.
  • Web App: Excessive whitespace generated in Scenario Variables table when edited.
  • Web App: Simulation duration does not appear on Simulation table's Engine tab.
  • Web App: Sticky Nodes in Chrome do not render correctly.
  • Web App: When adding new Nodes into a Flow, they occasionally get added off-screen or in an unexpected location.

v1.4.8​

Release date: 9 January 2024

New
  • Plot: Added new Engine configuration parameter plot.tight.layout which reduces the white space on time-series PDF outputs.
  • Plot: Added new Engine configuration parameter plot.show.all.x.labels which adds the x-axis label on all subplots on time-series PDF outputs.
Improvements
  • Plot: Updated ADVBANDS to output the % of samples which fall within the error bands, helping compare the accuracy of two channels (e.g. PSS®E v.s. PSCAD™ or PSCAD™ v.s. R2 data).
  • Web App: Clicking off the subplot or analysis dialogue box defaults to accepting the user changes (i.e. pressing 'OK'), rather than defaulting to discarding the user changes (i.e. pressing 'Cancel').
Fixed
  • Web App: Default column width for Scenario Variables is increased.

v1.4.7​

Release date: 12 December 2023

New
  • Plot: Added new Command, GRADIENT, to calculate line segment gradients - such as auto-calculation of S5.2.5.11 P(f) and S5.2.5.13 QV droop curves.
  • Template - AEMO GPS NER v200 - S5.2.5.11 & S5.2.5.13: Updated to include GRADIENT Command and associated analysis.
  • Web App: Added Node search bar which searches Node IDs and text in any Node window field.
Improvements
  • PSS®E Dynamic and PSCAD™: Removed support for DISTANCE%= Argument in SIMPLEFAULT and MULTIFAULT Commands, added a new Node-level distance factor setting.
  • Plot: Drawing a line on scatter plot data can now be toggled on/off.
  • Plot: Modified colour palette to improve contrast where multiple lines from a single Node are plotted together.
  • Web App: Increased number of characters in Plot Node title and subtitle fields.
  • Web App: Maximum number of Scenarios increased to 9.
  • Web App: Removed support for system.base.frequency Advanced Parameter and replaced with new Project setting on the General tab.
  • Web App: Updated location of row delete icon in Analysis Node window to match Global and Scenario Variables.
  • Web App: User experience improved when editing and savings rows in Global Variables, Scenario Variables and Analysis Nodes.
  • Web App: Node window remains open when switching between Project tabs.
Fixed
  • Web App: Failure to launch Simulation error if a Scenario was enabled without adding a Scenario Variable.

v1.4.6​

Release date: 5 December 2023

New
  • Data: Released new Node.
  • Engine: VALSCALE= Argument now supports simple math operations, such as VALSCALE=1/$g_project_max_p.
  • PSS®E Dynamic: Released new ADD Command which can be used to add reactors/capacitors for wide-area voltage disturbance studies.
  • PSS®E Static: Expanded CONTROL, Q=VDROOP and CONTROL, Q=VDIRECT control methodologies to support voltage control strategies typically used for synchronous condensers.
  • smiby: Added single phase current output channels.
  • Templates: (Australia) AusNet Services 1.5MW to 5MW System Study Requirements template now available.
  • Web App: Added small status windows to inform the user when a Simulation failed to schedule, has started or has finished.
Improvements
  • Engine: Allowed square and curly brackets to be entered in Argument values.
  • PSCAD™: Updated automatic firewall pop-up close to support latest Windows 11 pop-up style.
  • PSS®E Dynamic and PSCAD™ Improved validation on values provided to SIMPLEFAULT and TOVTEST.
  • PSS®E Dynamic: Improved DYRMODEL= typo detection, now raises warning if a DYRMODEL= Argument does not match any model in the specified dyre file.
  • Plot and Table: Increased character limit of output filename field.
  • Plot: Added DISPLAY= Argument to Edge detection Command EDGE.
  • smiby: Depreciated minimum reactance advanced smiby parameter, now derived from specified minimum resistance.
  • Web App: Moved location of delete button for Global and Scenario Variables.
  • Web App: Simulation launch time is now localised to your time zone.
  • Web App: The duration of a Simulation is now displayed on the Home page.
Fixed
  • PSCAD™: CONTROL, CH=, VALSCALE= raises unexpected errors.
  • PSCAD™: SCR and XR were interpolated between Commands and therefore differed in implementation to other Nodes, such as PSS®E.
  • PSS®E Static and PSS®E Dynamic: Excessive low impedance warnings for branches which have acceptable (but low) impedances.
  • Plot: Occasional backwards compatibility error in very old gridmo simulation files due to missing Advanced Parameter field.
  • Plot: PDF file merge error if filename is 6 characters long caused by Windows long filename backward-compatibility handling.
  • smiby: Fault mode was selected in smiby irrespective of faults being applied or not.
  • smiby: Ramping SCR or XR during simulation does not correctly apply due to EMTDC™ optimisation of branch impedances.
  • Web App: Description fields incorrectly allow multiple lines.
  • Web App: Occasional failure to launch error when using launch Simulation shortcut (Control + Enter).

v1.4.5​

Release date: 14 November 2023

New
  • PSCAD™ Node: Added initialisation mode (sets infinite bus voltage to a fixed value at the start of the simulation for a configurable time)
  • Plot Node: Added HBANDS= Argument to settling time and recovery time to display horizontal tolerance bands for the specified calculation.
  • Plot Node: Added Advanced Parameter show.all.x.lables which, if set to Yes, displays the x-axis label under each subplot.
  • smiby: VDISTURBANCE - OP=COMPENSATE included which extends the simple voltage divider calculation methodology to consider generating system contribution prior to disturbances.
Improvements
  • PSCAD™ Node: Case files are now automatically reloaded to resolve rare missing reference errors.
  • PSCAD™ Node: Improved Fortran compiler selection method if task requested Fortran version is unavailable.
  • PSS®E Static and PSS®E Dynamic Node: Reduced excessive error and warning text if an error occurs.
  • PSS®E Dynamic Node: CONTROL Command now supports multiple BUS= Arguments.
  • PSS®E Dynamic Node: Added sim.repeat.init.if.suspect=n Advanced Parameter (repeats initialisation n times if PSS®E dynamic initial conditions are suspect).
  • smiby: Sampled Vinf initial in a single place to avoid unnecessary duplication.
  • smiby: VDISTURBANCE - Logic separated from SIMPLEFAULT and TOVTEST to allow different calculation methodologies.
  • smiby: Additional logic added to POC Power Factor channel. If PF ≈ 1 or PF ≈ -1, then value is rounded to 1 to avoid issues of flipping between -1 and 1.
  • smiby: Improve the display names and descriptions of smiby parameters.
Fixed
  • PSS®E Static Node: Warning for Zsource too low displays wrong warning text and multiple swing buses warning incorrectly states a timeout occurred.
  • PSS®E Static Node: Buffer size error when using PSS®E 34 connection and very large case files.
  • PSS®E Static and PSS®E Dynamic Node: Checking branch impedances is very slow and raises excessive warnings for large case files.
  • PSS®E Static and PSS®E Dynamic Node: Branches with series reactance equal to PSS®E ideal branch impedance threshold unexpectedly raises a branch impedance too low warning.
  • PSS®E Dynamic Node: Branches which connect buses of different base voltage cause PSS®E to report that a case is converged when the case is actually in an unstable state. We added a check and raise an error if this issue is detected.
  • PSS®E Dynamic Node: OUTPUT, VAL=PF channel incorrectly outputs 0 if active or reactive power is exactly 0.
  • PSS®E Dynamic Node: DLLs for network merge not copied to working directory correctly.
  • PSS®E Dynamic Node: ADVFAULT doesn't apply fault if TYPE= Argument missing.
  • PSS®E Dynamic Node: Connection closed error when running large case files caused by dynamics user defined DLLs clashing (e.g. model debug output file writes overriding).
  • PSS®E Dynamic Node: Unexpected validation error if SETFILE command arguments were very long.
  • Plot Node: Subplot legends on right (secondary) axis plots do not match the corresponding LEGEND= Argument.
  • Plot Node: If a SETTLE_T Command does not settle, the shaded area is excessively large.
  • Plot Node: Error if OUTPUT Command is used and the AT= argument is an Internode Variable.
  • Analysis Node: Unclear error text raised if an Internode Variable is in an analysis statement, but that Internode Variable cannot be found in a linked Node.
  • Engine: If direct (EMTDC™) mode is disabled in the setup wizard, it does not re-enable despite being asked to do so.
  • Engine: Direct (EMTDC™) mode does not auto-acquire a PSCAD™ licence.
  • Engine: If Engine config stats.save=true some tasks fail unexpectedly.
  • Templates: wecc-solar default POC voltage changed to 1.025 [p.u.].
  • Docs: Minor corrections
  • Template - AEMO GPS NER v200: Minor corrections:
    • Remove error bands from Plots when only one power system software used.
    • Added "[p.u.]" into y-axis title for Va, Vb, Vc plots.
    • Set DISPLAY=NO for many Plot Output Commands to reduce overcrowding of Plots.
    • Remove 3s initialisation check when only running PSS®E Dynamic.
  • smiby: VDISTURBANCE - VCHANGEPU previously applied an absolute voltage disturbance. VCHANGEPU now applies a relative voltage disturbance and VPU applies an absolute voltage disturbance.
  • smiby: TOVTEST - Fixed calculation methodology for Qcap when specifying a desired overvoltage (e.g. 1.2 p.u.).

v1.4.4​

Release date: 17 October 2023

New
  • Engine dashboard: Uncompleted Simulations launched in past 48hr are shown on the home page, providing users the ability to see what is currently being run on the Engine.
  • Engine: Added optional Engine setting release.pscad.licence.timer to automatically release PSCAD™ licence when not running PSCAD™ Tasks.
  • Engine: Added Engine setting min.spare.hard.drive.space.gb to disable running new Tasks if the available hard drive space in the Working or Outputs folder is less than this setting value (in GB).
  • PSS®E Dynamic Node: Added PROCESS=ANGLE_WRAP optional Argument to post-process an ANGLE channel to between -180 to 180 degrees.
Improvements
  • PSS®E Static Node: Tasks now complete approximately 50% faster if using a v34.x PSS®E.
  • PSS®E Dynamic and PSCAD™ Node: Added RELVAL= Argument to allow for relative changes to CONs, ICONs and VARs (PSS®E) and channels (PSCAD™).
  • Plot Node: Rise, settle, recovery times and OUTPUT values are now shown on the interactive HTML plots and can be enabled and disabled by clicking the legend.
  • PSS®E Static Node: Generators now have their reactive power limits reset after a completed SOLVE Command and are set in voltage control mode with a target voltage as per the target bus's actual voltage after the SOLVE is completed.
  • PSS®E Dynamic and PSCAD™ Node: Multiple VDISTURBANCE Commands are now supported in both Node types. TOVTEST is no longer recommended for new Simulations. A warning is raised if VDISTURBANCE command is used but the smiby distance factor is not 1.
  • PSS®E Static Node: Added a warning if an ATLINE= Argument might be backwards based on the requested CONTROL Command.
  • Engine: Automated old version cache deletion moved from PSCAD™ Node to Engine setup wizard to prevent FileNotFound errors.
  • Engine: Greatly reduced file size of Simulation Summary interactive table.
  • Analysis Node: Summary title now uses the Title field of the Start Node for this Run, rather than the Analysis Node ID.
  • Template - AEMO GPS NER v200 - S5.2.5.13: Voltage disturbance tests included for Q control mode and PF control mode.
  • Template - AEMO GPS NER v200 - S5.2.5.5 & S5.2.5.13: Alternate scatter plots provided for Iq FRT injection curve and P(f) droop curve.
  • Template - AEMO DMAT v2 (Table 22) & AEMO DMAT v2: Source energy helper updated to look at Pgen, rather than Ppoc. Scatter plot of SE v.s. Pgen included.
  • Template - AEMO DMAT v2 (Table 22) & AEMO DMAT v2 - TOV tests: Replaced TOVTEST Commands with equivalent VDISTURBANCE Commands.
  • Template - AEMO GPS NER v200 & AEMO DMAT v2 (Table 22) & AEMO DMAT v2: Include PFpoc plot in PF control system related tests.
  • Templates - All: Updated Grid - SMIB - Voltage relative steps from % syntax to latest pu syntax (e.g. -10% -> -0.1 pu).
  • Templates - All: Removed AT=0 Commands from PSS®E Dynamic and PSCAD™ Nodes where the AT=0 Command was already in a Scenario Variable. This was to avoid having duplicated AT=0 Commands.
  • Template - AEMO GPS NER v200: Incorporated Analysis Nodes to align with Analysis checklists in the associated tutorial.
Fixed
  • Engine: Extra whitespace not removed from Internode Variable definitions under rare circumstances.
  • PSCAD Node connected to Plot Node: If OUTPUT, AT=x is used and x is equal to the Simulation length, then the value AT=0 is incorrectly output instead.
  • PSCAD Node: Occassional error if no CONTROL, CH=x, AT=0 Argument is provided.
  • PSSE Static Node: Potential duplication of internal generator definitions with multiple SOLVE Commands.
  • PSSE Static Node: The potential ATLINE= backwards warning is overly sensitive.
  • PSSE Static Node: Warning if the generator has hit a PMIN or PMAX limiter references wrong value in the 'generator requests' message.
  • PSSE Static Node: SCR=INF incorrectly creates a zero-impedance line which may cause dynamic model instability.
  • PSSE Dynamic Node: LINE=, VAL=I channel has no base specified so cannot be used.
  • Plot Node: Error displayed during Engine setup wizard if Python 2.7 mode is disabled.
  • Plot Node: TYPE=5255IQ incorrectly centres the x-axis about 1.0 pu, should be 0.0 pu.
  • Plot Node: Group of auto-scaling errors caused by plotting a single data point.
  • Plot Node: Auto-scaling between plot PDF and plot HTML are occasionally different, with the HTML plot occasionally not auto scaling correctly.
  • Plot Node: On HTML interactive plots, links to standalone folders appear even if logging type is selected as none.
  • Plot Node: Scatter plot error if connected to a Table Node where the x axis values are a loop variable and the y axis values are duplicated from two or more simulation results, such as two PSSE Dynamic Nodes.
  • Template - AEMO GPS NER v200 - S5.2.5.5: Tests initialise with s_psse_ss_set_infsource_sysnormal, not s_psse_ss_set_infsource_1pu where possible.
  • Template - AEMO GPS NER v200: Node titles, file outputs and variable names updated to be consistent.
  • Templates - All: s_psse_ss_set_plant_targets default value updated for Q control at the POC whereby VALSCALE=$g_project_max_q, QTARGET=$l_qcmd was updated to VALSCALE=$g_project_max_p, QTARGET=$l_qcmd. This aligns with Flow part of the template which provide l_qcmd values based on the project's rated active power [MW] (e.g. l_qcmd = 0.395).
  • Template - AEMO DMAT v2 (Table 22) & AEMO DMAT v2 - Table 8: Vref steps should be relative from g_default_poc_voltage, not start at 1.0 p.u. every time.

v1.4.3​

Release date: 3 October 2023

New
  • Simulation progress percentage is now shown on the Home page of the Web App.
  • The Simulation's gridmo JSON file is automatically saved into the Simulation's Outputs folder.
  • Plot Node: Supports multiple pages (for both PDF and interactive HTML).
  • PSS®E Static Node: Created ADD Command to add a new network element into the case.
  • Plot Node: Added shortcut links to the interactive HTML plots which link to the stand-alone folder (if created).
Improvements
  • Launching simulations is now much faster and processing errors are now displayed on the Home page of the Web App.
  • PSS®E Dynamic and PSCAD™ Node: Added RELVAL= Argument to allow for relative changes to CONs, ICONs and VARs (PSS®E) and channels (PSCAD™).
  • Plot Node: Rise, settle, recovery times and OUTPUT values are now shown on the interactive HTML plots and can be enabled and disabled by clicking the legend.
  • PSS®E Static Node: Generators now have their reactive power limits reset after a completed SOLVE Command.
  • PSS®E Dynamic and PSCAD™ Node: Multiple VDISTURBANCE Commands are now supported in both Node types. TOVTEST is no longer recommended for new Simulations.
  • PSS®E Static Node: Added a warning if an ATLINE= Argument might be backwards based on the requested CONTROL Command.
  • Engine: Automated old version cache deletion moved from PSCAD™ Node to Engine setup wizard to prevent FileNotFound errors.
  • Engine: Greatly reduced file size of Simulation Summary interactive table.
Fixed
  • Plot Node: Scatter plot type incorrectly only matched data from the same Node type - now requires same Node, software and software version.
  • Plot Node: Interactive HTML Plot type renders sub-plot legends even if disabled.
  • Plot Node: No error raised if SETTLE_T, RISE_T or RECOVERY_T have matching NAME= Arguments within a single Plot Node.
  • Table Node: merge on float32 and object columns error caused by incorrect type casting.
  • Engine: Any stalled process killed by backup process logic was listed as ERROR in the Simulation Summary but has no details as to why it errored.

v1.4.2​

Release date: 19/09/2023

Fixed
  • PSCAD™ Node: simulation cache incorrectly matches a previous simulation if the only change between two simulations were changes to PSCAD™ source files
  • Plot Node: OUTPUT Command incorrectly raises an error if the DISPLAY= argument was used
  • Plot Node: SETTLE_T Command incorrectly outputs a settling time of 0 if the values of the signal at both the START_T= and END_T= arguments were 0 and the change in signal is negative with no overshoot
  • Engine: excessive gridmo Engine licence validation requests

v1.4.1​

Release date: 12/09/2023

New
  • Added Analysis Node
  • Plot Node: added support for custom user-specified fonts
  • PSS®E Dynamic and PSCAD™ Node: added power factor output channel capability
  • PSS®E Dynamic Node: load conversion parameters (conl) can now be specified via advanced parameters
Improvements
  • Plot Node: SETTLE_T RISE_T and RECOVERY_T now have configurable per-unit start and stop bands
  • Plot Node: added DISPLAY= Argument for OUTPUT Command which renders a dot and displays the value in the data legend at the bottom of the plot
  • PSS®E Dynamic Node: relative voltage, GREF and VREF now supports +0.05 pu format in addition to +5% format (percentage format not recommended for new projects)
  • PSS®E Static and PSCAD™ Node: added simplified infinite SCR support, just set SCR=Infinite which sets the source impedance as low as possible for the respective power systems software
  • PSS®E Static Node: added a warning if neither end of a SET, LINE=, SCR=, XR= Command is the slack bus
  • Engine main log file gets very large with extended use (is now auto-rotated log)
  • Engine Simulation summary is now an interactive HTML and can be opened while Simulation is in progress
  • Unraveller: fixed a rare dependency issue when using multiple engines and a large Plot or Table merge
  • Unraveller: variables in comments and disabled fields are ignored
  • System requirements page: includes details on licence requirements for 3rd party power systems software
Fixed
  • Plot Node: sub-plot legends were incorrectly enabled on all Plot nodes regardless of the "Enable subplot legends" selection in the Web App
  • Table Node: fixed validation error if comments are included in the table data field
  • PSCAD™ Node: initial fix for incorrect Iq channel behaviour under bolted faults
  • PSS®E Dynamic Node: fixed rare silent error if an OUTPUT, GEN= command is missing an argument
  • PSS®E Static Node: fixed unbound localerror variable K error if multiple SOLVE commands used but a CONTROL, GEN= command is not redefined before the subsequent solve commands
  • Engine setup wizard incorrectly sets main log file to Outputs directory instead of executable location
  • Template T001 AEMO DMAT Table 22: fixed in Node 1095 (source energy, PSCAD) the initial source energy was incorrectly not using the Scenario Variable $g_pscad_change_source_energy
  • Docs: updated PSS®E Dynamic and PSCAD™ Node docs to document LEGEND Argument.
  • Docs: minor typo updates to AEMO GPS tutorial

v1.4.0​

Release date: 29/08/2023

New features:

  • Template T006 (East-coast Australian GPS) now available to gridmo customers
  • PSS®E Static Node: added PSS®E model merge capability
  • PSS®E Dynamic Node and PSCAD™ Node: Added new Command VDISTURBANCE which automatically switches between SIMPLEFAULT and TOVTEST to apply a SMIB voltage disturbance (either up or down)
  • Plot Node: added scatter plot option and capability
  • Plot Node: Added new commands ADVOUTPUT and EDGE
  • Engine displays what software packages (e.g. PSS®E) its gridmo licence allows
  • New smiby version released - added XOR phase angle measurement between V and Q (at POC) and added positive and negative sequence id and iq measurement
  • Best practices page included in docs

Improvements:

  • Engine's stand-alone compressed folders now include task type in the file name
  • Engine now displays simplified task IDs in logs and stand-alone compressed folder names
  • Plot Node: OUTPUT Command now correctly handles exporting multiple Internode Variables if multiple output data channels are being plotted
  • Table Node: automatically outputs Internode Variables using their column titles as the variable name
  • Plot Node: settling, rise and recovery time data display now includes subplot title
  • Plot Node: improved support for subplots which have no data from any linked Nodes
  • Added NUMBER= argument to SETFILE Command to support additional OEM configuration file formats
  • Engine worker management and task request API improved, tasks now launch and cancel quicker
  • Web App simulation status page now shows loading wheel when loading simulation status
  • Removed setting key worker.max as all Engines now use dynamic worker control
  • Asterisk now shown in Node window title if there are unsaved changes on the current Node

Fixed:

  • PSS®E Static Node: LOCKTAPS=YES does not lock taps if robust solution solver is triggered due to large system mismatch
  • Plot Node: RISE_T command calculates the rise time as 0 sec for a falling change
  • Plot Node: error if all sub-plots are disabled, or both left and right sub-plot axis have no data
  • Plot Node: error if a single sub-plot has more than 13 lines
  • Plot Node: error if an Internode Variable is used in the Commands field of a subplot
  • Plot Node: error if a linked task does not have a specified Internode Variable when using OUTPUT Command
  • PSS®E Dynamic Node: error for extremely long PSS®E simulations (over 700 seconds)
  • PSS®E Dynamic Node: docs states angle playback is absolute, but is actually relative to infinite bus angle (which defaults to 0 deg)
  • PSCAD™ Node: TOVTEST Command not enabling auto-calculation mode despite QCAP=CALC Argument
  • PSCAD™ Node: CMD does not support UNC paths error being raised if using network drive with direct (EMTDC™) launch mode
  • Invalid characters in the Project or Simulation Description raise errors on the Engine
  • Template T004 has old-style large Node IDs

v1.3.5​

Release date: 08/08/2023

New features:

  • Platform-wide
    • Added multi-Engine support (currently requires high-speed local network sharing between Engines and requires no common task type between Engines, such as one PSCAD™ Engine and one PSS®E Engine)
  • Engine
    • General
      • Added Engine config keys psse.worker.max and nolicence.worker.max to support limiting number of workers per task type
      • Maximum number of PSS®E, PSCAD™ and other Tasks (which don't require a licence) can now be overridden by your Engine's licence (to support multi-Engine setups)
      • gridmo_log Engine log modified to allow multi-Engine
    • Setup wizard
      • PSS®E, Python 2.7 and PSCAD™ can now be skipped during installer setup

Improvements:

  • Engine
    • Plotting
      • Fixed - ADVBANDS occassionally does not detect a settled transition window for long simulations
      • Fixed - SETTLE_T command states a signal does not settle within the defined time, but it does upon visual inspection

v1.3.4​

Release date: 01/08/2023

New features:

  • General
    • Number of spawned workers can now be configured by licence. Added pscad.worker.max Engine configuration setting
  • Web App
    • After you launch a simulation, Engine ID is locally stored for the session
    • Control + Enter shortcut added, launches simulation and saves current Node window
    • Added ability to copy and paste subplot data between Nodes
    • Added unsaved changes notification to top right of Web App and added unsaved changes dialog box when creating new Project
  • Engine
    • General
      • TOVTEST Command has QCAP=CALC argument value to automatically calculate the required MVAr to achieve an overvoltage
      • Added Command MULTIFAULT which enables single-command Multiple Fault Ride Through (MFRT) testing
      • Launching new simulation tasks is now faster, using unused workers to launch in parallel
    • PSCAD™
      • Released simulation caching feature
    • PSS®E
      • Dynamic - added VAL=IQ and VAL=ID to OUTPUT, GEN= Command
      • Added YP= and YQTARGET= alternative Arguments for the CONTROL, LOAD= Command to set constant admittance rather than constant power loads

Improvements:

  • Web App
    • Fixed - Cancel button incorrectly closes the Node window
  • Engine
    • General
      • Fixed - wecc-solar model PSS®E slider file (SLD) was not included in the Engine installer
      • Fixed - Engine does not raise warning if multiple Arguments in the same Command have the same value, such as CONTROL, GEN=101#1, GEN=101#1,
      • Fixed - space at end of Project title raises file not found error
      • Fixed - Engine making excessive API re-connections due to missing keep alive flag
    • PSS®E
      • Fixed - SIMPLEFAULT incorrectly assumes the infinite bus voltage is always 1.0 pu in fault impedance calculation
      • Fixed - error when using CONTROL, LOAD= Command when using PSS®E v34
      • Fixed - error when using OUTPUT, TX=a->b->c, VAL=TAPRATIO Command when using PSS®E v34
    • PSCAD™
      • Fixed - smiby incorrectly assumes the infinite bus voltage is always 1.0 pu in fault impedance calculation for SIMPLEFAULT
      • Fixed - PSCAD™ output files which are invalid (such as NaN or chatter records) is extremely slow to process

Template changes:

  • T001 AEMO DMAT Table 22
    • Test/result changes
      • T22 Row 58 (TOV test) - all tests - Duplicated into two optional runs. The first uses an automatically calculated capacitance using TOVTEST, QCAP=CALC and the other using a voltage playback generator. Setting the QCAP values for 1.15pu and 1.20pu is no longer required. Removed QCAP helper.
    • Other changes
      • T22 Row 63 (Voltage oscillation) - all tests - Added additional disabled plot which overlays V and Q for two cycles as required for submissions to Powerlink QLD (Australia)
      • T22 Row 55 (Unbalanced faults) and T22 Row 57 (MFRT Benchmarking) - all tests - added sub-plot level legend to identify different phase voltages
      • Fixed - T22 Row 65 (SCR=1 P steps) and T22 Row 66 (SCR=1 post fault) - all tests - disabled PSS®E Nodes incorrectly used old $_ANGLE variable
      • Fixed - T22 Row 59 (V/Q/PF steps) - all tests - removed unnecessary voltage playback data from Nodes without voltage playback
      • Fixed - T22 Row 61 (F ramps) - all tests - reduce length of subtitle to avoid clipping with customer logo
      • Fixed - T22 Row 64 (Angle change) - all tests - PSS®E only plot missing psse sub-directory in output file path
      • Fixed - all terminal VAL=IQ references in wecc-solar PSS®E studies updated to new GEN, VAL=IQ Command
  • T002 AEMO System Strength Impact Assessment Guidelines (v2.1) Withstand SCR
    • Released into the Template Library

v1.3.3​

Release date: 18/07/2023

New features:

  • Web App
    • Included a popup window to warn of unsaved Node changes
  • Engine
    • General
      • Added optional dynamic worker control, where number of parallel simulations automatically scales based on available PC resources - recommended for powerful dedicated simulation PCs
      • Added task start time, end time and simulation duration in simulation summary
      • Added MULTIFAULT command for one-command multi-fault ride through (MFRT) tests, with 20 pre-configured MFRT sequences compliant with AEMO DMAT
      • Added simulation ID and last message to Worker status logging option
      • When a simulation is cancelled, the Engine will now force shutdown these tasks immediately rather than waiting for them to complete
    • PSCAD™
      • Migrated to a new faster output file converter
    • Plotting
      • Added customer logo support onto Plotly HTML plots
      • Added sub-plot legends and secondary y-axis support to allow multiple channels from the same Node to be plotted on the same sub-plot (currently PDF only)
    • Docs
      • The smiby block is no longer packaged with the engine, instead is now available on the docs website
    • Misc
      • Released new EULA for the Engine, revised the terms on the smiby block and added terms into auto-generated stand-alone folder scripts to align with public release of smiby.

Improvements:

  • Web App
    • Node IDs are incremental
    • Minor formatting improvements to Scenario Variables table
    • Run priority removed
  • Engine
    • General
      • Fixed - if a simulation is stopped by backup process kill logic, it doesn't appear in the simulation summary
      • Fixed - order of simulation description, simulation id and engine version make finding the latest created folder in the Output folder difficult
      • Fixed - adding a space to the end of the simulation description raises missing folder error
    • PSS®E
      • Fixed - performance of AT=0 commands is unclear, AT=0 should apply at first time step, AT=-1 should apply before the first time step
      • Fixed - scale on OUTPUT, GEN=, VAL=Q scale is incorrect
      • Fixed - very long simulations can cause occasional timeout error
    • PSCAD™
      • Fixed - smiby's default channel values should use the configured scales, so the values align with web app commands
      • Fixed - smiby's angle measurement multimeter incorrectly uses fixed 50 Hz
      • Fixed - pscx and pslx files in sub-directories were not being pre-processed before launching PSCAD
      • Fixed - rare PSCAD file conversion fail caused by EMTDC inserting chatter occurrence records into .out files
    • Plotting
      • Fixed - plot and table Nodes incorrectly merge with files in other output folder subdirectories
      • Fixed - Plotly HTML compression results in unacceptably low resolution for studies with small disturbances, such as voltage oscillation studies

Template changes:

  • T001 AEMO DMAT Table 22
    • Test/result changes
      • T22 Row 56 (PSCAD MFRT) and T22 Row 57 tests (MFRT benchmarking) - replaced SIMPLEFAULT commands with new MULTIFAULT command. First fault now at 5 seconds. Fixed - time spacing for first two faults in each sequence did not have spacing as per AEMO DMAT requirements
      • Fixed - T22 Row 62C (Extended voltage recovery) - tests 188-10, 188-50, 188-80, 189-10, 189-50 and 189-80 - the significant voltage dip during this test is now applied via SIMPLEFAULT, not via external grid playback
      • T22 Row 68 (Source energy) - tests 226 and 228 - no PSS®E Dynamic Node was previously included in this study, it has now been added. Note AEMO DMAT at time of writing is unclear if this Node is required, but it has been added for completeness
    • Other changes
      • Fixed - T22 Row 55 (PSCAD unbalanced faults) - tests 85A, 85B, 91A and 91B - plots were incorrectly labelled as 0% residual voltage, but the test is instead a bolted (0 ohm) line-line fault
      • Fixed - T22 Row 67 (FRT benchmarking) - all tests - reduced excess simulation time on PSCAD™ and PSS®E Dynamic Nodes (excess time was beyond end of plot), reducing simulation time
      • Fixed - T22 Row 68 (Source energy) - all tests - reduced excess simulation time on PSCAD™ and PSS®E Dynamic Nodes (excess time was beyond end of plot), reducing simulation time
      • Fixed - test 0.3 PSCAD™ Node was incorrectly labelled as test 0.4
      • All plots from this template now save to a DMAT sub-directory
      • All helper plots from this template now save to a helpers sub-directory within the DMAT directory
      • Added PSSE only and PSCAD only plots (normally disabled) instead of just benchmarking plots. These files are in individual sub-directories psse and pscad respectively

v1.3.2​

Release date: 04/07/2023

New features:

  • Engine
    • General
      • Worker all-temp folders now in compressed (.zip) file format to improve upload speed using OneDrive or similar
      • Improved Engine shutdown handling, now stops all tasks and worker processes before exiting
    • PSS®E
      • Added warning - dynamic simulation can be unstable if infinite generator reactance is effectively zero
      • Added warning - not updating project rated power can cause strange convergence errors due to ultra-low SCR
      • Multiple generator support for Dynamic Node CONTROL Commands for CON, ICON, VAR.
    • PSCAD™
      • Greatly improved the algorithm for finding and disabling unused output channels, improving simulation speed
      • Added advanced parameter ignore.errors.at.sim.end to ignore PSCAD™ simulation errors which occur at the very end of a simulation (to support some OEM models)
      • Added advanced parameter never.emtdc.direct.launch to prevent an Engine from launching the specified PSCAD™ Node using direct (EMTDC) launch mode, irrespective of Engine config
      • Added support for incorrectly named smiby blocks (i.e. smiby_1) and raises a warning to fix, rather than raising an error

Improvements:

  • Web App
    • Scenario Variables page no longer editable when disabled
    • Reduced cache of files stored in Template Library
  • Templates
    • T001
      • Added missing PSCAD™ Q=0 command in R59D (Q control steps)
  • Engine
    • General
      • Fixed - warnings are not reported in the simulation summary for tasks which error
      • Fixed - number of recommended workers in setup wizard appears invalid
    • PSS®E
      • Fixed - CONTROL, BUS=, ICON= command raises error
      • Fixed - docs incorrectly state that OUTPUT, TX= did not have I ID and IQ output channel support
    • PSCAD™
      • Fixed - smiby block uses the xr_in parameter for calculating the XR ratio of the equivalent impedance irrespective of the External control selection
      • Fixed - EMTDC error if single smiby channel has multiple data points with the same time, but different value
      • Fixed - error if firewall popup is closed by another popup close thread
      • Fixed - PSCAD™ temporary processing folder incorrectly being copied into stand-alone folder
      • Fixed - direct (EMTDC) launch mode uses the wrong batch file path when loading
      • Fixed - SETFILE command incorrectly raises errors if hyphens are present in the FILENAME= argument
      • Fixed - PSCAD™ task will raise error if not licenced, despite a licence being available
    • Plotting
      • Fixed - interactive plot generator does not correctly skip disabled axes when adding axes titles
      • Fixed - 'may be too long to fit on plot' warning should not be a warning
      • Fixed - plot x axis ticks do not always appear on bottom-most subplot in subplot column
      • Fixed - error when using ADVBANDS with TAT= argument which has a time value after the end of the time series data being plotted
      • Fixed - interactive plot generator repeats the legend entry if multiple lines are plotted on the same sub-plot
      • Fixed - error raised in interactive plot generation if a subplot has a single Internode Variable and this Internode Variable is from a disabled Node and is the only time series data output of this disabled Node

v1.3.1​

Release date: 27/06/2023

New features:

  • Docs
    • Public release of docs.gridmo.io with significant changes throughout the documentation
    • Added links to new YouTube video tutorial series
  • Templates
    • Updated template T000 (Single run example) with a PSCAD™ Node and standardised Global and Scenario Variable names
    • Released template T001 (Australian AEMO Table 22 DMAT) with hybrid generator support using gridmo standardised Global and Scenario Variable names
    • PSCAD™
      • Released new smiby block version:
        • Added built-in single-phase RMS voltage output channels at the point of connection
        • Removed unused cap_r and cap_l parameters

Improvements:

  • Web App
    • Fixed - launching simulation fails when using Scenario Variables with specific characters
    • Fixed - launching extremely large simulations occasionally caused error
  • Engine
    • General
      • Fixed - gridmo_update_smiby.py helper python macro not included in engine installer
      • Fixed - smiby config file defaults not included in engine installer
    • PSS®E
      • Fixed - maximum value for node.convergence.gain advanced parameter should be 0.5, not 0.1
      • Fixed - engine does not handle expired PSS®E licences correctly and creates multiple popups
    • PSCAD™
      • Fixed - PSCAD™ task raises index error if direct (EMTDC™) launch mode is set to false
      • Fixed - PSCAD™ task raises 'no iid error' if multiple components in the workspace match the iid of a SET, CIID= command
      • Fixed - EMTDC™ raises XYTABLE error if duplicate entries (same time and value) in smiby channels

v1.3.0​

Release date: 13/06/2023

New features:

  • Platform-wide
    • Added Scenario Variables for hybrid generator studies
    • Expanded plotting options, added HTML interactive plot which supports zoom and crop
    • Expanded engine software capability, allowing overlaying of multiple PSS®E and PSCAD™ versions in one Run
    • Refined simulation launch options to minimise files created in the Output folder
  • Web App
    • Increased character limits for several fields
  • Engine
    • PSS®E
      • Added new PSS®E Static output command OUTPUT, VAL=VDROOPTARGET to calculate a voltage droop target to help flat-start dynamic simulations
      • Added optional arguments QMAX and QMIN to PSS®E Static CONTROL, Q=VDROOP command to limit Q capability at a remote branch and bus when using voltage droop control
    • PSCAD™/EMTDC™
      • Optimised workspace loading to increase simulation speed
      • Now automatically closes firewall popups when starting PSCAD simulations
    • Plotting and Table
      • Now supports folders in output file name, such as DMAT\DMAT - T22 R58 - TOV test

Improvements:

  • Web App
    • Fixed - loops not connected to an end Node will schedule when they should not
    • Fixed - infrequent 502 error for engine API
  • Engine
    • General
      • Fixed - API connection does not support corporate proxies like ZScaler
      • Fixed - support for relative and absolute voltage references in the same field in External grid controls has been disabled
      • Fixed - undefined loop or Global Variables in a Node often causes engine validation error
    • PSS®E
      • Fixed - PSS®E Static Node CONTROL, ATLINE=TERMINALS raised error when using legacy 32 bit connection
      • Fixed - PSS®E Static Node logging incorrectly reported the wrong unit for OUTPUT, VAL=V commands
      • Fixed - PSS®E Nodes raising charmap error in PSS®E v35 caused by dyre file encoding
    • PSCAD™
      • Fixed - PSCAD™ reloads the master library after loading, slowing down simulations
    • Plotting
      • Fixed - plot scaling rarely not showing all data when using default Auto scaling mode

v1.2.4​

Release date: 06/06/2023

New features:

  • Engine
    • General
      • Added new error for missing commas in Commands
    • PSCAD™/EMTDC™
      • Added v5.0.2 support
    • PSS®E
      • Added advanced parameter voltages.tolerance and reduced the default voltage solver accuracy tolerance
      • Added warning where a PSS®E Dynamic simulation may have stopped early, but not failed (as occurs with some generator model failures or bad initial conditions)
    • Plotting
      • Added customisable colours to output plots
      • Added option to add minor grid lines to output plots (default is off - only major grid lines)

Improvements:

  • Engine
    • General
      • Fixed - rare simulation deadlock caused by race condition in task status buffers
      • Fixed - long wait for licence acquisition upon awaking if PC is slept with gridmo engine running
      • Fixed - temporary file cleaner occasionally deletes in-progress work during long simulations
      • Fixed - backup process kill logic raises error
    • PSS®E
      • Fixed - PSS®E Dynamic Node ID channel incorrectly reporting missing PBASE argument
      • Fixed - "None" path error if DLLs folder in a PSS®E Dynamic Node is a Global Variable which is an empty string
      • Fixed - PSS®E Static Node incorrectly handles power factor = 0
      • Fixed - PSS®E Dynamic Node output DLLs folder in STANDALONE folder generation fails if DLLs folder in Node configuration is not exactly dll
    • PSCAD™
      • Fixed - PSCAD™ does not close if error raised during pre-build or building EMTDC™ executable
      • Fixed - PSCAD™ v5.0.2 occasionally unloads all libraries in the workspace after loading
      • Fixed - direct (EMTDC™) launch mode incorrectly warning for being in debug mode in production engine
      • Fixed - excessive log output being created during copying files to temporary folder (resulting in longer task completion times)
    • Plotting
      • Fixed - output files from plots creating extremely large files
      • Fixed - error when using ADVBANDS command when no lines are present in the sub-plot
      • Fixed - PSS®E Dynamic Node crashing on first time step causes NaN auto-scale error in plot
      • Fixed - hatching of rise, settle or recovery time on sub-plots does not have any transparency and doesn't match the line's colour

v1.2.3​

Release date: 30/05/2023

New features:

  • Web App
    • Nodes can now be enabled and disabled individually or in groups by dragging a box over the Nodes which holding shift, then pressing right click and selecting Enable or Disable
    • Renamed Variables tab to Global to represent Global Variables. Added import/export to CSV capability and added Notes field in Global Variables table
  • Template library
    • Added wecc-solar PSCAD™ model
  • Engine
    • General
      • Old files in the Working directory are now automatically deleted
    • PSS®E
      • Renamed ID and IQ channel SBASE into PBASE and QBASE respectively
      • Added METERBUS= optional flag to static and dynamic studies
    • PSCAD™/EMTDC™
      • New release of smiby block:
        • True distance factor d=1 and d=0 fault capability
        • Added new parameter for minimum inductance of any series components
        • Added new parameters to specify base values for ID and IQ channels to match PSS®E
        • Added 3PHG fault type
      • Improved multiple PSCAD launch method to minimise simulation PC slowdown
    • Plotting
      • Added AEMO Power System Modelling Guideline compatible error bands (ADVBANDS command)
      • Renamed older ERROR_BANDS command to SIMPLEBANDS and expanded capability
      • Added custom logo support (co-branding next to gridmo logo) for output PDF plots
      • Added minor tick marks to vertical axes

Improvements:

  • Web App
    • Fixed - single backslashes in Global Variable value caused simulation launch error
  • Backend
    • Fixed - loop variables weren't supported in merge Table and Plot Nodes
    • Tasks are now strictly scheduled in first-in first-out order (priority now given to finish older simulations rather than starting new ones)
  • Docs
    • Fixed - broken links on PSCAD™ Node page
  • Engine
    • General
      • Fixed - python 2.7 installer buttons in engine wizard were not greyed out during pip install
      • Fixed - rare duplicate task status update resulting in deadlocks of some long simulations
    • PSS®E
      • Fixed - confusing error if there are no output channels in dynamic simulation, but field is not empty (i.e. has comments only)
      • Fixed - silent error if cannot find branch in the loaded case file during a branch flow P or Q check
      • Fixed - network frequency dependence incorrectly defaulted to True
    • PSCAD™
      • Fixed - workspace/case file time-step or plot-step is not overridden unless advanced parameter specified
      • Fixed - extremely high SCR or XR values making residual voltage of faults inaccurate
      • Fixed - base value for ID and IQ channels were incorrect in smiby
      • Fixed - engine wizard loads a case file and adds to existing workspace, rather than opening a new workspace

v1.2.2​

Release date: 16/05/2023

New features:

  • General
  • Web App
    • Added simulation status to app front page. You can now view the status of your simulations and cancel unwanted simulations
    • Added sticky notes Node type. You can now leave notes for yourself or colleagues directly on the web app
  • Template library
    • Released template library
    • Added new template Single run example to the template library which replaces the simple-solar-farm.json example Project (was previously packaged in the installer)
  • Engine
    • General
      • Task request timer replaced with dynamic timer (requesting new tasks now quicker, improving simulation speed)
      • Added VALSCALE= flags to multiple PSS®E and PSCAD™ commands to support command or variable unit scaling which is different between PSS®E and PSCAD™ models (for example, command target is in per unit in PSS®E vs MW in PSCAD™)
    • PSS®E
      • Implemented PSS®E robust solution to improve low fault level solving capability
    • PSCAD™/EMTDC™
      • Added new command SETFILE which modifies an external text or configuration file prior to starting the simulation
      • Removed sim.compiler advanced parameter, replaced with pscad.compiler and pscad.version Engine configuration parameters.
      • Engine setup wizard now configures PSCAD and optionally direct (EMTDC) launch mode
      • Log file of commands sent to EMTDC exe now created when running in direct (EMTDC) launch mode if Save all temp is selected
    • Plotting
      • Added new command OUTPUT to output value of a PSS®E or PSCAD™ channel to an Internode Variable
      • Added new advanced parameter diff.after.merge.with to generate a blue/red overlay of the PDF being generated by this Node and an existing PDF to highlight the differences between them

Improvements:

  • Web App
    • Fixed - rated active power decimal rounding issue
    • Fixed - missing advanced parameter tab on Plot Nodes
    • Removed TBC fields from PSS®E Dynamic and PSCAD™ parameter Node windows
    • Improved loop and loop variable validation (new error types LoopVariableInFileName and UniqueFileName added)
  • Engine
    • General
      • Removed unnecessary printed output from Engine setup wizard console
    • PSS®E
      • Fixed - single line diagram (PSS®E Slider file) was not being copied into Standalone folder
      • Fixed - file path for DLLs used in dynamic simulation was incorrect in Standalone auto-generated python macro
      • Fixed - scale of OUTPUT, VAL=Q, GEN= channel was incorrect
    • PSCAD™
      • Fixed - unused output channels within a sub-module were not disabled when they should have been
      • Fixed - EMTDC raising XY table points out of order error due to incorrect sorting of AT= flags in smiby channel files
    • Plotting
      • Fixed - plot output filenames do not support spaces
      • Fixed - legend overlapping with the bottom sub-plot if more than 3 lines plotted on a single plot Node

v1.2.1​

Release date: 01/05/2023

New features:

  • Engine
    • General
      • Included simple-solar-farm.json as an example Project with the installer.
      • Simulation summary file now includes simulation id in file name.
    • PSS®E
      • TOVTEST command added (to add the same capability as the PSCAD™ Node TOVTEST command).
    • PSCAD™/EMTDC™
      • Added direct (EMTDC) launch mode which uses PSCAD™ to build the simulation executables and then runs these executables directly. Early testing shows ~13% increase in simulation speed for a typical DMAT template due to lower PSCAD™ overhead.
      • Added new settings parameters emtdc.launch and emtdc.batchpath for direct (EMTDC) launch mode.
      • New release of smiby block, added smiby_POC_ID and smiby_POC_IQ channels, added min_ohms smiby parameter to allow customisable minimum impedance values.
      • Added system.base.frequency advanced parameter to PSCAD™ (to match PSS®E).
      • Mixing absolute and relative (%) voltage changes is now supported in PSCAD™ Node (such as required for AEMO DMAT tests 186 through 189).

Improvements:

  • Engine
    • General
      • Fixed error where Internode Variable would try to be matched even if the line was commented out.
      • Fixed error caused by extra whitespace in external generator control fields (such as voltage, frequency or angle).
      • Fixed Engine logging information being displayed when in worker status log display mode.
      • Setup wizard now asks if the example files should be copied into the inputs directory, rather than just copying.
      • Fixed occasional extra lines being added to simulation summary file.
    • PSS®E
      • Fixed error when using SIMPLEFAULT,FZ=xx% in a PSS®E v34 dynamic simulation.
      • Fixed incorrect scale in PSS®E v34 PLBVFU1 auto-created playback generator file.
      • Increased PSS®E v34 legacy API connection timeout timer (so timeout doesn't occur under very heavy PC simulation load).
      • Expanded SIMPLEFAULT warnings.
      • Error now raised if CONTROL,CON=, CONTROL,ICON= or CONTROL,VAR= is provided a BUS= flag when it is actually a generator, or vice-versa.
    • PSCAD™/EMTDC™
      • Standalone folder creation now copies required library files for external models.
      • TOVTEST command now supports DURATION= flag to switch capacitor out.
      • TOVTEST command no longer causes singularity error if QCAP= is given zero or negative value.
      • smiby block internal multimeter sampling rate now toggles between base frequency and 1000 Hz based on VOLT_OSCIL command presence.
      • smiby block smiby_POC_FREQ channel was incorrectly measuring infinite bus frequency, updated to POC.
    • Plotting
      • Fixed error when multiple PSCAD™ plots appear on a single sub-plot.
      • Fixed spaces in plot filenames incorrectly throwing an invalid filename error.
    • Table
      • Fixed error when a Loop Variable containing text (rather than numbers) was added to table output data.

v1.2.0​

Release date: 12/04/2023

New features:

  • Web App
    • Highlight Node on Flow when Node is selected and being edited in the Node window.
    • Provide links to relevant page of docs above command text area fields.
    • State management library includes version management to allow backward compatibility of older JSON files.
  • Engine
    • General
      • Added a setup and upgrade wizard to set the gridmo Engine configuration file.
      • Engine installer no longer requires admin rights, now installs in the users local AppData directory.
      • Added Standalone folder creation feature which creates a folder which includes the minimum files to repeat a PSSE or PSCAD™ simulation outside of the gridmo Engine. This feature is designed for sharing repeatable results with other parties. To create the file, select the Save all logs and working files checkbox on the Simulation launch page.
      • Temporary files are now deleted after completion of a Run. To save all temporary files into the outputs folder, use the Save all logs and working files checkbox on the Simulation launch page.
      • Simulation ID of each Task now included in Engine log files.
    • PSS®E
      • STATE and VAR channels can now be plotted by using the OUTPUT,VAR= and OUTPUT,STATE= output commands in PSS®E Dynamic Node.
      • Added output command to export transformer tap ratio as an Internode Variable, use OUTPUT, VAL=TAPRATIO, TX=, NAME= command.
      • Added static study advanced parameter system.swingbus.ignorevolt which disables voltage checking limits for the swing bus. This value defaults to YES which is typically appropriate for SMIB studies. For full system model studies, setting this value to NO is recommended.
      • Added a check to raise a warning if any branch in the PSS®E model may be too low to prevent load flow convergence (typically <0.0001 pu on 100 MVA base)
      • Added a warning if the system apparent power base is not 100 MVA.
    • Plot
      • Auto smart scaling added. This mode will provide reasonable scaling limits based on the data type being plotted.
      • Recovery time calculation added using the RECOVERY_T command in Plot Nodes.

Improvements:

  • Web App
    • File -> Download project adds a timestamp to the file name.
    • Improve UI when inserting new Nodes.
  • Engine
    • General
      • Task version now included with simulation id in Working and Outputs folders directories.
      • Fixed error when worker process has stalled and was forced stopped by the Engine.
      • If a Task encounters an error, all dependent Tasks will be cancelled to prevent unnecessary cascading errors.
    • Plot
      • Removed title and subtitle text being limited to 40 or 60 characters, now raises warning if the title or subtitle may be too long.
      • Strong plot colour order has been improved. The colour of the lines on the plot depend on the Node type (Order is DATA then PSCAD™ then PSS®E Dynamic). If there are any duplicate Node types, then they will be plotted based on the layout of the Nodes in the Flow (Order is left to right).
  • Docs
    • Updated Installation and Configuration pages to match new Engine setup and upgrade wizard.
    • Expanded Terms and definitions page to include adding, bulk moving and copying Nodes and Edges.

v1.1.1​

Release date: 28/03/2023

New features:

  • Web App
    • Implement Edge copy and paste.
    • Implement analytics, session debugging and error logging.

Improvements:

  • Web App
    • Allow Project rated active power [MW] to include values to two decimal places.
    • Fixed issue where data would not correctly load when selecting Plot Nodes.
    • Output type Nodes (e.g. Plot, Table) will place outputs (e.g. .pdf, .csv) in the outputs folder even if not in a loop.
    • Improve text validation in Loop: Start Nodes, including ability to add comments and white spaces between values.
  • Engine
    • General
      • Failed Tasks now copy to the all-temp folder when Save all logs and working files is selected on the Web App launch tab.
      • gridmo_config.cfg parameter dirs.model renamed to dirs.inputs for future data import functionality (for example, overlaying PQ data recording with input data).
      • Contents of gridmo_config.cfg file now printed to console and log file when Engine opens.
      • Added Task version check with simulation version from Web App.
    • PSS®E
      • Redesigned and improved the 'legacy 32bit' mode. This mode supports 32bit PSS®E (back to v34.3). Added new gridmo_config.cfg parameter py27.path (Python 2.7 is now required in addition to the gridmo Engine installer).
      • Fixed 'legacy 32bit' mode sometimes not shutting down the 32bit PSS®E API when a simulation finished successfully.
      • Fixed error when Run using 'legacy 32bit' mode and OUTPUT,LINE= or OUTPUT,TX= commands were used.
      • Fixed error when OUTPUT commands have a NAME= flag with lower case letters in PSS®E Dynamic Nodes.
      • Added support for USRBUS 'other' model types in PSS®E Dynamic Nodes for CONTROL, ICON=, CONTROL, CON= and CONTROL, VAR= commands.
    • Plotting
      • Added a warning which raises if no data is found in any linked Nodes for a single subplot.

v1.1.0​

Release date: 17/03/2023

New features:

  • Web App
    • Implement Node copy and paste.
    • Implement user feedback when launching simulations.
  • Engine
    • PSCAD™/EMTDC™
      • PSCAD™/EMTDC™ v5.0.1 support added.
      • The smiby block, which provides control channels and acts as an equivalent external grid/source.
      • Variable SCR, XR, frequency, voltage and angle playback.
      • Single and multi fault (MFRT) capability, including specifying via residual voltage or fault impedance.
      • Transient over-voltage (capacitor switch-in).
      • Source voltage oscillation / amplitude modulation capability.
      • Output channels automatically disabled if not in use (to increase simulation speed).
      • Time step, plot step, feed forward signals etc all configurable.

Improvements:

  • Web App
    • General:
      • Implement gridmo branding (e.g. fonts, colours)
      • Update copyright to 2023.
    • Backend:
      • Increase robustness of unraveller.
  • Engine
    • General:
      • Improvements to Engine console logging (connection re-established, message on change of log output type).
      • Engine no longer hangs if console window is selected/highlighted.
      • Prevented crash on invalid config values, now displays errors via popup.
    • PSS®E
      • Removed record.macro advanced parameter, Python macro recording now enabled as default if Save all temp is checked on the simulation launch web page.
      • ierr API error values now give additional information on error (where available from PSS®E API).
      • Engine now autodetects and applies correct playback generator version PLBVF1 (v35) and PLBVFU1 (v34, via USRMDL).
      • Warning now raised if slack bus generator (equivalent) has Z source too high, which may cause unexpected behaviour during voltage playback simulations.
      • External grid angle change can now be controlled independently.
      • Fixed error in OUTPUT,GEN= commands.
      • Fixed output scale for OUTPUT,GEN= active and reactive commands. Now MW / MVAr to match OUTPUT,LINE= command.
    • Plot
      • PSCAD™/EMTDC™ files plot first (in colour order) before PSS®E results.
      • Fixed missing font error for plot generation.
      • Expanded logging warnings, such as warning if vertical max value is less than vertical min value.

v1.0.0​

Release date: 27/02/2023

First release.