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Analysis of modular multilevel converters with DC short circuit fault blocking capability in bipolar HVDC transmission systems

机译:双极高压直流输电系统中具有直流短路故障阻止能力的模块化多电平转换器的分析

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This paper analyzes the station-internal phase-to-ground fault in bipolar HVDC transmission systems. An overvoltage problem due to the existence of the bipolar cells in the modular multilevel converter (MMC) arms closer to the grounding pole are presented. Consequently, a new hybrid arm MMC is proposed to overcome the overvoltage problem while providing the benefits of: a lower number of cells, fewer switching devices and lower conduction losses. Guidelines are developed and confirmed by simulation results to determine the required number of cells to block the DC side fault.
机译:本文分析了双极高压直流输电系统中的站内相接地故障。提出了由于模块多电平转换器(MMC)臂中更靠近接地极的双极单元的存在而引起的过压问题。因此,提出了一种新的混合臂MMC来克服过压问题,同时提供以下优势:更少的电池单元,更少的开关设备和更低的传导损耗。制定了指南并通过仿真结果进行了确认,以确定所需的单元数量以阻止DC侧故障。

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