基于双闭环控制的三相三电平PWM整流器研究

摘要

针对三相三电平PWM整流器具有输出谐波少、电流畸变率小、适合向高压和大容量方向发展的特点,提出了一种基于双闭环控制的三相三电平PWM整流器的设计方案；分析了该整流器主电路原理及其数学模型的建立,详细介绍了电压外环和电流内环双闭环控制策略、中点电压平衡控制策略的实现.Matlab/Simulink仿真结果表明,该整流器具有良好的动态和稳态性能.%In view of characteristics of less output harmonics,low distortion rate of current and suitable for development of high-voltage and large capacity,the paper proposed a design scheme of three-phase three-level PWM rectifier based on double closed-loop control.It analyzed principle of main circuit and building of mathematical model of the rectifier,introduced implementation of control strategies of double closed-loop with voltage loop and current loop and neutral-point voltage balance in details.The simulation result of Matlab/Simulink shows that the rectifier has good dynamic and stable performances.