三相四线统一电能质量调节器的控制策略

针对电网输入电压的不平衡、非正弦及负载的不平衡、非线性特性，提出了一种基于三相静止坐标系下的三相四线统一电能质量调节器（UPQC）的协调控制策略。该策略将UPQC的串联变流器控制为基波正弦电流源，而并联变流器控制为基波正弦电压源，从而实现了三相四线UPQC对电能质量的综合控制能力，既改善了电网侧的电能质量问题，实现了电网输入电流的正弦及单位输入功率因数，也改善了负载侧的电能质量问题，实现了负载电压的平衡、额定及正弦。10 kVA系统实验装置的实验结果表明了该控制策略的有效性。

A Control Strategy for Three-phase Four-wire Unified Power Quality Conditioner

In order to govern unbalancing and distorting voltages in network and suppress the influences of nonlinear loads, a coordinated control strategy based on ABC rest frame for three-phase four-wire unified power quality conditioner (UPQC) is introduced. By controlling the series converter as a fundamental sine current source and the parallel converter as a fundamental sine voltage source, the proposed control strategy can make the UPQC carries out all of the control terms: the sinusoidal input current, the unit input power factor, the sinusoidal and balanced output voltage with normal value to improve power qualities at the side of networks and at the side of loads. The experimental results of 10 kVA prototype verify that the strategy is feasible.