基于ABC坐标系的三相四线并联型APF控制策略

Control strategy based on ABCframe for three-phase four-wire shunt active power filter

为提高三相四线制并联型有源电力滤波器(APF)的谐波及中线电流补偿精度和动态性能,引入基于ABC坐标系的控制策略.该控制策略在时域下完成对直流侧电压和补偿电流的闭环控制,各相之间完全解耦.根据系统主电路数学模型设计直流侧稳压环、均压环以及由PI控制器和重复控制器组成的复合电流环控制器,有效保证了系统闭环稳定性和谐波补偿精度.各类工况下的实验结果验证该控制策略在三相四线制并联型APF系统中的可行性和有效性.

A control strategy based on ABIZ frame was introduced to improve the harmonic and neutral line current compensation accuracy and dynamical performance of three-phase four-wire shunt active power filter （APF）. It is completely decoupled among each phase because it achieved the closed-loop control of DC- bus voltage and compensation current in time domain. According to the mathematic model of the main circuit of system, the stabilization voltage loop, equalization voltage loop and compound current loop with PI controller and repetitive controller were designed. Closed-loop stability and harmonic compensation accuracy were effectively assured. Experimental results in kinds of working conditions verified the efficiency and feasibility of the proposed control strategy in three-phase four-wire shunt APF prototype.