关键词: PWM整流器, 开关函数, 非最小相位, 小信号模型

Abstract:

Three-phase PWM rectifier is widely used because of low input current harmonics and high power factor.The construction of system model is an important part of research,and the establishment of the rectifier model has a direct impact on the control strategy.Kirchhoff's law and the Lagrange equation are usually adopted to establish the mathematical model with coupling between variables.Since the mathematical model described by switching function is nonlinear and the controller's design is difficult,the average model of switch cycle average method is adopted to establish the system to get the steady-state model and a small signal model of linear and invariant.The results show that the small signal model is better in system controller design than the traditional model.

Key words: PWM rectifier;switching function;non minimum phase;small signal model