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电网技术  2015 

用于MMC-HVDC直流故障保护的新型拓扑及重合闸控制策略

DOI: 10.13335/j.1000-3673.pst.2015.08.037, PP. 2312-2319

Keywords: 高压直流,新型子模块混合级联结构,直流双极短路故障,系统重合闸

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Abstract:

针对柔性直流架空输电线路频发的瞬时性直流故障,提出了模块化多电平改进子模块结构和混合级联拓扑以及MMC系统重合闸控制策略。新型子模块及混合级联结构具有直流故障自动闭锁和迅速恢复的能力,能进一步降低造价及损耗,并能继承已有成熟的控制方法。系统重合闸控制可以使柔性直流系统在小电流情况下判断直流故障是否消除并恢复系统运行,能有效应对永久性、瞬时性直流双极短路故障。文章构建了等效电路来分析直流双极短路故障及重合闸过程,并通过PSCAD/EMTDC仿真对所提方案进行了有效性验证。

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