串联型电压暂变补偿新拓扑及其控制方法研究

提出了一种简化的无变压器无储能电容的串联型电压暂变补偿主电路拓扑,并分析了其控制策略。新拓扑可使电路体积减小,成本更低;通过微调指令电压与负载电流的夹角可以达到控制母线电压幅值的目的;通过给指令电压施加一个微小的直流偏移电压,可以达到控制直流上、下母线电压的平衡的目的。介绍了改进的简化主电路拓扑,详细分析了其工作原理和控制方法。仿真结果验证了该方案的可行性和分析的正确性。

A Novel Simplified Voltage Sag Compensator Topology and Its Control Strategies

A novel simplified main circuit topology of series voltage transient variation compensator without both transformer and energy storage capacitor is proposed and its control strategy is analyzed.The proposed novel topology can decrease the volume of main circuit and reduce it cost.By means of controlling the included angle between command voltage and load current,the purpose of controlling the amplitude of busbar voltage can be achieved;by means of applying a tiny DC offset voltage to command voltage,the voltage balance of the two capacitors located at upward side and downward side of the bus respectively can be achieved.The simlified topology of main circuit is presented and its woking principle and control approach are analyzed in detail.The feasibility of the proposed scheme and the correctness of analysis are verfied by simulation results.