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Warning 106 | [Various software] | Turning off reference bus


Relevant software:

PSS®E
PowerFactory


Emitted message:

A command or part of a command is turning off a swing/reference bus. This may result in all buses being disabled in this network - or may result in the power systems simulation failing to converge.

Description:​

This warning indicates that a SET command is turning off a swing bus in your power systems model.

info

There are several terms which refer to the same bus/generator combination as a 'swing bus':

  • PSS®E: Swing bus (bus with type code 3).
  • PowerFactory: Reference bus.
  • Other common terms: Thévenin equivalent source, infinite bus, infinite source.
danger

Turning off a swing bus may result in all buses being disabled in the network or cause the static simulation to fail to converge.

Possible impact:​

  • Power flow solutions require at least one swing bus to complete power flow simulations.

Potential fixes:​

  • Review any SET, GEN=, STATUS=OUT commands in your PSSE Static or PowerFactory Static Nodes to check you are not accidentally turning off the swing/reference bus.