基于重复和PR复合控制的单相PWM整流器的研究

如何减少交流侧电流谐波对电网的影响,是PWM整流器控制的关键问题。针对谐波产生的主要原因,提出了基于重复和PR的复合控制策略。PR控制实现了对正弦电流的无静差跟踪,重复控制利用其内模实现了对谐波扰动的记忆和修正。并基于MATLAB对单相PWM整流器进行了仿真,对比了PR控制、重复控制和基于重复和PR复合控制三种方案的仿真和实验结果,复合控制策略使得交流侧电流谐波少、动态响应快,对电网谐波扰动有更好的抑制效果。

A Research on Single-phase PWM Rectifiers Based on Compound Repetitive Control and PR Control

How to reduce the influence of AC side current harmonics upon the power grid is the key point for the control of PWM rectifiers.In view of main causes for occurrence of harmonics, this paper presents a compound control strategy based on repetitive control and PR control.PR control realizes tracking of sinusoidal current with zero steady-state error, while PR completes memory and correction of harmonic disturbance by using its internal model.Furthermore, the single-phase PWM rectifier is simulated on the basis of Matlab.Simulation and experimental results are compared for PR control, repetitive control and compound control, and it is concluded that the compound control strategy can reduce AC side current harmonics, has quick dynamic response, and can better suppress harmonic disturbance of the power grid.