Modeling of Switched Reluctance Generator Based on Modelica

In this paper, a novel model of a switched reluctance generator is established. And based on the idea of object-oriented modeling, the stator, rotor, power converter, current chopper, and PID controller of the switched reluctance generator are modeled. And Modelica is used as the modeling language. The most complex part of building a switched reluctance generator model is its nonlinear characteristics. There are two nonlinear relations. The first one is that the machine flux linkage is dependent on the stator current and rotor position. Another one is that the electromagnetic torque is also dependent on the stator current and rotor position. The nonlinear characteristics are generally described by the finite element method and the function approximation method. This paper uses both methods to establish a switched reluctance generator model, and then compares the simulation results of the models established by the two methods. The model of the switched reluctance generator established in this paper is a three-phase selfexcited switched reluctance generator with three pairs of stators and two pairs of rotors as an example.

I. Introduction

Switched reluctance generator (SRG) is characterized by simple structure, low cost, simple maintenance, extremely low requirements for the working environment, flexible control methods, and output voltage of direct current. They are often used in aerospace vehicles and wind energy[1]. When the generators are used in aerospace vehicles, in order to ensure the safety and reliability of aerospace vehicles, the electrical characteristics of switched reluctance generators need to be accurately described. Therefore, this paper describes the electrical characteristics of a switched reluctance generator by the modeling and simulation of it. Traditional Simulink modeling of electrical equipment is based on signal modeling, which has a large difference in physical connection with the actual equipment, which is very different in topological structure from actual equipment. And the built model has poor reusability.