.PowerGrids.Electrical.Test.SynchronousMachine4Windings

Information

Test case for the conversion of external parameter to internal parameters taken from Kundur, Power System Stability and Control, example 4.1. Note that the system frequency for this example is 60 Hz.

The machine is directly connected to an ideal bus with UNom = 24 kV and phase = 0 and initialized in steady-state with PmPu = 0.9, ufPu = 0.000939, using the Kundur base excitation voltage.

The following internal parameter values are reported from Kundur and match the ones computed by the model with timeConstantApproximation=classicalDefinitions.

The following table reports the steady-state solution computed by Kundur in Example 3.2 and by the PowerGrids model. Note that the Kundur example unfortunately includes a the effect of an 83.5% magnetic saturation, which is not accounted for in the PowerGrids model, so the two sets of values do not match exactly, particularly as regards the reactive power and the quadrature current. However, the difference is compatible with the effect of the reduced inductances. Also note that the sign convention for id, iq is opposite to Kundur's.