基于滑模变结构及前馈解耦的PWM整流器仿真

Simulation of PWM Rectifier Based on Sliding Mode Variable Structure and Feed-Forward Decoupling

针对传统控制下三相PWM整流器超调量高,抗干扰能力差的特点,设计了电压、电流双闭环控制方案。其中电压外环为滑模变结构控制,电流内环为前馈解耦PI控制,调制方法采用SVPWM。文章给出了三相PWM整流器的数学模型,并在此基础上重点设计了电压外环滑模变结构控制器。仿真结果表明,交流侧电流呈正弦形,谐波含量小于5%,系统响应速度快,且能适应负载的扰动,具有良好的动静态特性。

In view of the characteristics of high overshoot and poor dynamic anti-interference capability of three-phase PWM rectifi-er under traditional control,a double closed-loop control scheme of voltage and current is designed.The voltage outer loop is a slid-ing mode variable structure control,the current inner loop is feedforward decoupling PI control,and the modulation method adoptsSVPWM.In this paper,the mathematical model of three-phase PWM rectifier is given,and a voltage sliding mode variable struc-ture controller is designed.The simulation results show that the current of the AC side is sinusoidal,the harmonic content is lessthan 5%,the response speed of the system is fast,and the system can adapt to the disturbance of the load,and it has good dynamicand static characteristics.