中文摘要：

电压质量调节器（voltage quality conditioner,VQC）常规控制中,其串联变流器主要输出有功功率处理电压暂降问题,通常处于待机状态,未得到充分利用。文章针对所设计的VQC结构,提出基于有功环流的VQC功率流协调控制策略,利用串联变流器输出无功功率,分担并联变流器的无功补偿功能。通过分析系统中功率流和有功环流的变化,得到串并联变流器的无功分配策略、串联变流器的复合控制策略和储能单元的补偿策略,实现了VQC各单元的协调控制。仿真与实验结果验证了所提控制策略的有效性与可行性。

英文摘要：

Voltage quality conditioner （VQC） can be used to solve many kinds of power quality problems in distribution network and in conventional control the series converter of VQC mainly outputs active power to cope with voltage sag and is usually in standby state, so it is not fully utilized. According to the structure of the designed VQC and based on active circulating current a coordinated control strategy for power flow in VQC is proposed, that is, the reactive power compensation function of parallel converter is shared by outputting reactive power by series converter. The reactive power allocation strategy between series and parallel converters, the composite control strategy of series converter and the compensation strategy of energy storage component are attained by analyzing the variation of both power flow and active circulation current in the system, thus coordinated control of units in the VQC is implemented. Results from simulation and experiments verify both effectiveness and feasibility of the proposed control strategies.