SynchronousMachineDynamics Class

Synchronous machine whose dynamic behaviour is described by a user-defined model.

The simplified model represents a synchronous generator as a constant internal voltage behind an impedance<i> </i>(<i>Rs + jXp</i>) as shown in the Simplified diagram. Since internal voltage is held constant, there is no <i>Efd</i> input and any excitation system model will be ignored. There is also no <i>Ifd</i> output. This model should not be used for representing a real generator except, perhaps, small generators whose response is insignificant. The parameters used for the simplified model include: - RotatingMachineDynamics.damping (<i>D</i>); - RotatingMachineDynamics.inertia (<i>H</i>); - RotatingMachineDynamics.statorLeakageReactance (used to exchange <i>jXp </i>for SynchronousMachineSimplified); - RotatingMachineDynamics.statorResistance (<i>Rs</i>).

All synchronous machine detailed types use a subset of the same data parameters and input/output variables. The several variations differ in the following ways: - the number of equivalent windings that are included; - the way in which saturation is incorporated into the model; - whether or not “subtransient saliency” (<i>X''q</i> not = <i>X''d</i>) is represented. It is not necessary for each simulation tool to have separate models for each of the model types. The same model can often be used for several types by alternative logic within the model. Also, differences in saturation representation might not result in significant model performance differences so model substitutions are often acceptable.