中压并联型DVR链式变流器主电路及参数设计

Main Circuit and Parameter Design of Medium Voltage Parallel Type DVR Chain Converter

中压并联型动态电压恢复器(DVR)由快速开关(HSS)和并联电压源变流器组成。电网发生故障时HSS关断,并联变流器转入负荷电压控制运行模式,并联变流器内置的超级电容器向负荷释放能量。此处对并联链式变流器主电路进行分析与比较,设计了链式变流器功率模块直流侧滤波电路,给出了滤波电路参数设计方法,并通过仿真和实验验证了直流侧滤波电路滤波效果,给出了链式变流器并网运行实验结果。

The medium voltage parallel type dynamic voltage restorer(DVR)consists of a high-speed-switch(HSS)and a parallel voltage source converter.When a power grid fault occurs,the HSS is turned off,and the parallel converter enters the load voltage control operation mode.The built-in supercapacitor of the parallel converter releases energy to the load.The main circuit of a parallel chain converter is analyzed and compared,a DC side filtering circuit for the power module of the chain converter is designed,a design method for filtering circuit parameters is provided,and the filtering effect of the DC side filtering circuit is verified through simulation and experiments.The results of the grid-connected operation experiment of the chain converter are presented.