移相控制技术在串联有源电压质量调节器中的应用

本文首先对采用移相控制技术来抑制直流侧电压泵升时电网过电压倍数、负载功率因数、移相角及补偿电压大小之间的关系进行了理论分析，然后从能量平衡角度对直流侧电压泵升现象进行了讨论，揭示了直流侧电压变化与逆变器能量流动的关系，在此基础上提出了基于直流测电压闭环控制的移相控制策略，并给出了具体的实现方法。实验室3kW单相串联有源电压质量调节器以及容量分别为50kVA和100kVA的三相四线制串联有源电压质量调节器的实验结果表明，装置可以根据电网和负载运行状况自动对负载参考电压进行渐进移相，移相及直流侧电压泵升抑制效果非常好，对谐波、过压、不平衡等电压质量问题有良好的补偿作用，是一种实际可行的控制方法

A Research on the Application of Phase Shift Control for Active Voltage Quality Regulator

The relationship between overvoltage ratio, power factor, phase shift angle and compensation voltage is first analyzed in this paper. Then the investigation into the DC-link voltage pumping-up from the viewpoint of real power flow was conducted and a novel closed-loop phase shift control method based on the DC-link voltage was proposed. The experiment achieved in the laboratory examined the feasibility of the proposed idea, the result showed that AVQR based on the proposed idea performs very well in sustaining DC-link voltage, and it also ensured the progressive phase shift of load voltage. Two AVQR with a respective rating of 50kVA and 100kVA were also developed afterwards, they have been successfully integrated o into a realistic power system environment and have a good performance of mitigating voltage disturbances.