中文摘要：

针对统一电能质量调节器UPQC常规控制中，其串并联变流器功能相对独立、利用率低的问题，提出基于无功功率流的UPQC协调控制策略。应用所设计的UPQC系统结构，协调分配UP．Qc串并联变流器的无功功率输出，控制串联变流器输出电压向量垂直相应的电流向量，控制并联变流器输出电流向量垂直相应的电压向量，有效消除了有功环流的影响。特别针对电网侧没有电能质量问题时，控制串联变流器继续输出无功功率，充分发挥两变流器的无功补偿功能。理论推导UPQC系统功率流的关系，并仿真实验分析提出的控制策略，结果表明该控制策略解决电能质量问题的同时，实现了UPQC串并联变流器功率的合理分配。

英文摘要：

According to the relatively independent functions and low utilization rate o5 me unmea power quality conditioner（UPQC） series and parallel converters in UPQC regular control, the UPQC control strategy based on reactive power flow is provided. With the designed UPQC structure, the strategy real- ized the coordinate distribution of the reactive power output of the UPQC series and parallel converters. The influence of active power circulation was effectively eliminated by controlling output voltage vector of the series converter perpendicular to the corresponding current vector and output current vector of the par- allel converter perpendicular to the corresponding voltage vector. Especially when there is no power quali- ty problem of the grid side, the strategy controlled the series converter to continue reactive power output and fully played the reactive power compensation function of both converters. The relationship of UPQC system power flow was theoretical deduced and the proposing control strategy was analyzed by simulation and experiment. The results show that the control strategy solves the power quality problems and realizes the rational power allocation of the UPQC series and parallel converters.