Physical phase variable models of electrical equipments and their applications in integrated drive simulation for shipboard power system

In this paper, we present our efforts on the modeling of electrical equipments for integrated drive simulations. FE-based phase variable model is proposed to pursue an accurate and fast simulation of various equipments. In the proposed model, the inductances are obtained from the sequential nonlinear FE solutions covering a complete ac cycle so that the effects of ferromagnetic nonlinearity and periodic variation of magnetic path geometry (e.g. due to rotation) on inductances are taken into account. Such a model allows the maintenance of the high accuracy of the FE modeling and the elimination of its time consuming drawbacks. We applied the concept of FE-based phase variable modeling to various types of machines, including the permanent magnet synchronous motor, the brushless dc motor, the induction motor, and a three phase iron core transformer. Modeling and implementation key points, verifications, examinations, and application examples are given in this paper.