李小鹏;汤涌;朱清代;庞广恒;张鹏;甄威;

• 1:国网四川省电力公司电力科学研究院
• 2:电网安全与节能国家重点实验室(中国电力科学研究院有限公司)

摘要(Abstract)：

为提高直流线路后备保护的可靠性和速动性,提出了一种利用测量波阻抗相位特征差异的直流线路纵联保护方法。通过对直流输电线路区内、外故障时线路两端测量波阻抗的相位特征分析可知,在一定频率范围内,直流线路内部故障时,线路两端测量波阻抗相位约为–90?;在直流线路外部故障时,线路两端测量波阻抗相位分别接近–90?和0?。区内、外故障下线路两端测量波阻抗相位差异明显,据此可以实现对区内外故障的判别。由于区内外故障时测量波阻抗的相位特征仅与直流线路边界和线路波阻抗有关,与故障距离、过渡电阻和故障类型等因素无关,因此该保护方法的门槛值易于整定。PSCAD/EMTDC仿真结果表明,该保护方法的动作性能不受故障距离、过渡电阻和故障类型的影响,具有良好的灵敏性和速动性。

关键词(KeyWords)： 直流输电线路;测量波阻抗;直流线路边界;相位特征;纵联保护

Abstract:

Keywords:

基金项目(Foundation): 中国博士后科学基金(2016M592659)~~

作者(Author): 李小鹏;汤涌;朱清代;庞广恒;张鹏;甄威;

Email:

DOI: 10.13335/j.1000-3673.pst.2017.1242

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