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MMC子模块元件短路故障机理及其新型保护策略

, PP. 21-27

Keywords: 模块化多电平换流器子模块,故障机理,保护策略,时序,反向晶闸管,短路击穿

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Abstract:

介绍了基于模块化多电平换流器(MMC)子模块的主电路和控制方式,在分析子模块故障机理的基础上,提出了器件选型的技术要求,计算了元器件短路保护动作时间,讨论了VT1元件故障短路时应对的保护策略,提出了一种在原MMC子模块电路拓扑上增加反向晶闸管的新型保护策略以限制故障范围,并可取代旁路机械开关。PSCAD仿真结果验证了该保护策略的正确性,新增的反向晶闸管对保护及时性和有效性具有重要作用。

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