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基于模块化多电平换流器的直流输电系统网侧不平衡故障穿越研究

, PP. 197-203

Keywords: 模块化多电平换流器,柔性直流输电,不平衡故障,电压波动

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Abstract:

基于模块化多电平换流器(ModularMultilevelConverters,MMC)柔性直流输电系统在电网发生单相或两相故障时,会导致MMC桥臂上产生两倍频的正序,负序和零序环流,零序环流由于不能在三相桥臂之间相互抵消而进入高压直流侧,会影响其他换流站的运行.为此设计了二次零序环流控制器来对其进行抑制.并针对不平衡故障时,在相同传输功率下子模块电容电压波动幅值变大的问题,提出了通过对桥臂注入一定的负序二次环流,降低子模块电容电压波动的控制策略.在Matlab/Simulink中搭建了基于MMC-HVDC的仿真模型,仿真结果表明此算法能保证直流母线电压的稳定,并降低子模块电容电压的波动,提高了MMC换流器不平衡故障的穿越能力.

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