对并联型电力有源滤波器直流电容平均电压与纹波电压的变化规律进行了研究 ,分析了直流电容平均电压与纹波电压对并联型电力有源滤波器性能的影响 ,在此基础上 ,提出了相应的直流电容平均电压与纹波电压的一种控制方法 ,给出了使并联型电力有源滤波器性能达到最佳时直流电容平均电压应满足的条件 The variation law of average voltage and ripple voltage of DC capacitor in shunt active power filter is studied. The influence of DC average voltage and ripple voltage on the performance of shunt active power filter is analyzed. On the basis of this, A corresponding control method of average voltage and ripple voltage of DC capacitor is proposed, and the condition that DC average voltage should be satisfied when the performance of shunt active power filter is optimized is given