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电网技术  2015 

高压直流输电线路微分欠压保护特性与定值整定

DOI: 10.13335/j.1000-3673.pst.2015.08.036, PP. 2303-2311

Keywords: 高压直流输电,微分欠压保护,定值整定,PSCAD/EMTDC

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Abstract:

微分欠压保护是高压直流输电线路的主保护,其保护定值的合理性至关重要。研究了微分欠压保护故障电气量的动态特性,分析了故障位置、过渡电阻和运行工况对电气量的影响,从而为定值整定提供理论支撑。结合向上工程,分析了微分欠压保护判据,提出了微分欠压保护定值的整定方法。建立了向上工程的PSCAD/EMTDC模型,对保护定值进行了整定,并验证了定值的合理性。

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