FE-based physical phase variable models of electric machines and transformers for dynamic simulations

This paper presents the development of the FE-based physical phase variable models for electric machines. Our results show that the developed FE-based phase variable models provide the same accuracy as the full FE model but with much faster simulation speed. These models are necessary for the study of new control strategies to facilitate dynamic simulation in an industrial environment. The FE-based phase variable model is developed with the lumped circuit parameters obtained from FE solutions covering a complete steady state ac cycle. These parameters are described by tables and utilized through table lookup procedure during the simulation. These models take into consideration the effects of nonlinear magnetization and geometry variation, winding arrangements and rotation. In the case of iron core transformers, the model takes into account the inductance variations with the flux amplitude as well as its phase angle during a complete ac cycle. The FE-based phase variable model for various types of machines were studied, including pm synchronous machine, brushless dc motor, induction machine, and transformers