基于逆系统方法的三相PWM整流器控制

针对三相脉宽调制(PWM)整流器控制采用非线性反馈方法使控制器设计复杂化的问题,提出一种基于逆系统方法的三相PWM整流器的反馈线性化控制方法。利用三相PWM整流器数学模型,以直流输出电压、有功和无功电流作为状态反馈变量,推导出三相PWM整流器的逆系统,并构造出伪线性系统。通过对该伪线性系统的综合,设计出三相PWM整流器的闭环控制系统,实现了无功电流分量和直流电压的解耦,然后对该闭环控制系统进行了计算机仿真。结果表明,所采用的控制策略能够实现三相PWM整流器直流电压和无功电流的解耦控制,且性能良好。

Inverse control of three-phase PWM rectifier

Aiming at the complicated design of three-phase PWM(Pulse Width Modulation) rectifier by using nonlinear feedback method,a linear feedback approach based on inverse system method is presented.Based on the mathematical model of three-phase PWM rectifier,which takes the DC voltage,active and reactive currents as state feedback variables,an inverse system of three-phase PWM rectifier is deduced and a pseudo linear system is constructed.By synthesizing the pseudo linear system,a close-loop control system is designed to decouple the reactive current and DC voltage.The proposed close-loop control system is simulated,and results show that the decoupled control of DC voltage and reactive current is realized with better performance.