三电平PWM整流器双闭环系统的设计与仿真

三电平PWM整流器多采用电压控制外环和电流控制内环组成的双闲环控制系统。电压外环的作用是根据直流电压Udc的大小决定三电平PWM整流器输出功率的大小和方向以及三相电流的给定信号。电流内环的作用是使整流器的实际输入电流能够跟踪电流给定，实现单位功率因数或功率因数可变。文中主要研究了三电平PWM整流器的系统设计，并进行了仿真。结果表明，所设计的双闭环系统具有良好的抗扰动性能，动态响应也得到了明显的改善。

Design and Simulation of Three-Level PWM Rectifier Based on the Double Closed Loop

The model of three-level PWM rectifier is usually designed based on the double closed loop control system with voltage outer and current inner loops. The voltage outer loop decides the valueof three-level PWM rectifier output and the direction of three-phase current reference signal. And the current inner loop tracks the given current. This paper mainly studies the three-level PWM rectifier system design and simulation. The results show that the designed double closed loop system has good performance and there is a marked improvement in dynamic response.