Nodal Reduced Induction Machine Modeling for EMTP-Type Simulations

This paper presents two new induction machine models with a direct interface to an external power system, for EMTP-type simulations. The models´ improved efficiency and their overall superiority over existing formulations are shown by numerical simulations involving different machines. It is shown that models that use currents as output variables possess a high degree of numerical accuracy at relatively large time steps making them competitive with a state-of-the-art model that uses the stator currents and rotor fluxes as output variables. The use of a single set of variables is shown to simplify considerably the models´ representations, resulting in highly efficient formulations.