Simulation of switched reluctance motors embedded in large networks

The paper compares three approaches for the simulation of a switched reluctance motor (SRM) considering the degree of accuracy and the availability of input data. The simplest model neglects the magnetic saturation effects while in the next level, the nonlinear flux linkage-current relationship at a given rotor angle is realized as the weighted sum of magnetic characteristics at two extreme rotor positions. The most detailed simulation model uses look-up tables of flux-linkage and motor torque data obtained through static measurements or FEM simulations. The models are implemented in PSCAD/EMTDC electromagnetic transient program with motor windings are interfaced with rest of the network modeled within the electromagnetic transients program as a set of Norton current sources. Validity of the simplified models under various conditions is studied taking detailed model as a reference. Ability of the simulation of SRM drives embedded in a large electrical network using the models developed is demonstrated through an example.