基于相移SPWM技术的电流源有源滤波器的研究

ANALYSIS ON CONTROL SYSTEM OF CURRENT SOURCE ACTIVE POWER FILTERBASED ON PHASE-SHIFTED SPWM TECHNIQUE

由相移 SPWM组合变流器构造了电流源型有源滤波器 ,分析了其交流侧和直流侧数学模型。为了提高系统的动态性能 ,抑制暂态振荡 ,对于交流侧提出了基于极点配置的控制方法 ;为了补偿系统损耗在直流侧采用 PI调节器。通过实验证明 ,这种有源滤波器在较低的器件开关频率下稳定性好、动态响应快 。

A novel current source active power filter based on multi-modular converter with phase--shifted SPWM technique isproposed. With this technique, the effect of equivalent high switching frequency is obtained with low switching frequencydevices, which is most promising in large power equipment, such as active power filter. Both mathematical models of thisnovel APF on AC and DC side are analyzed. In order to improve the system's control ability. state feedback on AC side andPI feedback on DC side are provided. Satisfactory compensation can be obtained under very low switching frequency, which isverified through experiment.This project is supported by National Natural Science Foundation of China (No. 59777023).