低电平MMC-HVDC样机滤波装置设计

摘要

为了确保低电平模块化多电平换流器直流输电(MMC-HVDC)样机注入公共电网的谐波含量符合现有的电能质量标准条例,对其进行配套的滤波装置设计是必要的.文章根据MMC拓扑结构特点,推导出了MMC的等值电路,并将MMC看成一个有多种谐波的谐波电压源,从而设计了MMC交流侧谐波的等效电路.在此基础上,结合MMC-HVDC的调制策略,设计出了与样机配套的滤波装置,仿真结果表明了其滤波装置设计方法的正确性.%In order to ensure the harmonic of common electric network injected by low level prototype of modular multilevel converter high voltage direct current (MMC-HVDC) could accord with existing electric power quality standard regulations, it is necessary to design filtering devices for the prototype. According to the topology structure of MMC, an equivalent circuit was deduced, and regarding MMC as one harmonic source con-tairfing multiform harmonics, the equivalent circuit which could calculate the harmonic at AC side of MMC was obtained. Based on above, and combined with modulation strategy of MMC-HVDC, the filters for the prototype were designed. Simulation results show the method to design the filtering devices is correct.