有源滤波器参考电流和电网电压的同步

提出一种关联型有源滤波器参考电流的测定方法，并推导出一种新的同步原理，通常的同步方法是基于检测电网电压过零点，由于电压信号对干扰很敏感，尤其在过零点附近，容易产生错误的同步脉冲信号，导致完全错误的参考电流，所提出的新方法在线检测电网电压和负载电流，并在线计算电源基波电压，不仅可完全补偿无功功率，抑制谐波电流，而且能快速跟踪负载电流的变化。

Synchronization of active filter current reference to the network

An improved method to determine active filter current reference is presented. A new principle ofsynchro nization is proposed.The common synchronizationisbased on netvoltage zero crossing detection. Since it is very sensitive to disturbances especially at the values close to zero,false synchro nization pulsescan be generated.The proposedmethodmeasures net voltage and load current,and calculatesnetvoltage fundamental component on line.As a result,the whole reactive power can be compensated,theharmonicdistortion isgreatlyattenuatedand load current change can be quickly responded.