有源电力滤波器闭环控制策略

The closed loop control strategy for active power filter

首先通过对PI控制器的仿真指出了它在有源滤波中的局限性,提出将重复控制引入到电流环中以提高稳态性能。进而将重复控制和PI控制算法并联用于并联型有源电力滤波器输出电流波形控制,其中PI控制保证系统动态性能,而重复控制则提高输出电流波形的跟踪精度。分析了控制器的设计思路和频率特性,仿真实验表明,该方法可以显著改善滤波效果。

The paper firstly pointed out the limitations of the PI control in the active power filter by the simulation, and put forward that let the repetitive control into the current loop could improve the steady - state performance, so that the repetitive control and PI control algorithm were in parallel and could used in the output current waveform control of shunt APF. The PI control insured the system dy- namic performance, and the repetitive control improved the tracking precision for the output current waveform. Controller design ideas and frequency characteristic were analysed. The simulation results showed that this method could improve the filtering effect.