提出了一种新的并联型有源电力滤波器指令电流生成方法.通过给定与电源电压基波正序分量同频率的正余弦表来提取电源电压的基波正序分量,再利用同步检测方法生成指令电流.该方法省却了锁相环电路,避免了锁相环电路的检测误差及延时问题,提高了检测的准确性；适用范围广,尤其是能适用于电源电压畸变和不对称条件下.理论推导和仿真结果都验证了该方法的正确性和可行性.%A new method to calculate the current reference for shunt active power filter (APF) is presented. The fundamental positive component of the supply voltage is obtained by given the sine and cosine table whose frequency is the same as the supply voltage fundamental positive component, generate the current reference with the synchronous detection method. The method obviates the phase-locked loop circuit, avoid the problem of the detection error and delay of the phase-locked loop circuit, the detection accuracy is improved; The proposed method works well under various load conditions, especially in the case of a distorted and asymmetric supply. The theoretical analysis and simulation results verify the validity and feasibility of the proposed method.
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