.Dynawo.Examples.SMIB.SMIBStepEfdPm

Synchronous machine infinite bus with steps on Efd and Pm

Information

This test case represents a 501 MVA synchronous machine connected to an infinite bus through a transformer and a line, with an active and reactive load between the transformer and the line.

A step on PmPu is applied at t = 5 s, followed by a step on EfdPu at t = 15 s. The two figures below show the expected evolution of the generator voltage and active power during the simulation.

The step on PmPu causes an increase in the active power and a decrease in the stator voltage, as a bigger current implies a bigger voltage drop between the infinite bus and the generator. The step on EfdPu entails a rise in the stator voltage.

The variations of the stator voltage are reflected in the active and reactive power consumed by the alpha-beta load, which are proportional to the voltage at the load terminal.

Initial equations are provided on the generator differential variables to ensure a steady state initialization by OpenModelica. It had to be written here and not directly in Dynawo.Electrical.Machines.OmegaRef.GeneratorSynchronous because the Dynawo simulator applies a different initialization strategy that does not involve the initial equation section.
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