中文摘要：

以统一电能质量控制器（UPQC）左串-右并主电路结构为研究对象,从其基波稳态等效电路入手,给出了在电压波动时并伴有相位跳变的相量图;依据主电路总容量最小的原则导出了串联补偿电压的最优注入角;基于瞬时无功理论及低通滤波器提取电源基波相电压初始相位及相位跳变角,结合总容量最小时的最优注入角确定了目标电压函数,使UPQC输出相应的补偿电压。通过仿真和实验验证了在主电路容量最小时确定串联补偿电压最优注入角的控制策略。

英文摘要：

The unified power quality conditioner（UPQC） with seris on the left and parallel on the right of the main circuit is taken as an object of the study.Based on its base wave steady-state equivalent circuit,phasor diagram with phase angle jump during voltage fluctuation is given.According to the principle of total capacity minimal of main circuit,the optimization of the angle of injection voltage is analyzed.Based on the instantaneous reactive power theory and low-pass filter extracting power fundamental waves＇ phase voltage preliminary angle and phase jumping angle,the object voltage function is defined combining with the angle of injection voltage of total capacity minimal.This object voltage function makes UPQC putting out corresponding compensation voltage.Finally,control strategy is proved by simulation and experiment that determining series compensation voltage optimal injection angle when capacity of main circuit is minimal.