为了进一步提高UPQC的性能，将有源功率因数校正(APFC)技术引入UPQC直流储能单元的直流电容电压控制，详细阐述了其工作原理，并给出了仿真实验结果。

To enhance the performance of UPQC, active power factor correction (APFC) technology is introduced into the DC energy storage unit of UPQC for capacitive voltage control.

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控制逆变器直流电容的平均电压与电压波动为适当值是保证并联型电力有源滤波器具有良好补偿性能的一个重要因素。

Controlling the DC capacitor average voltage and fluctuant voltage at an adequate value is an important factor which guarantees the excellent compensation characteristics of shunt active filter (APF).

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