梁睿;孙式想;

• 1:中国矿业大学信息与电气工程学院

摘要(Abstract)：

单端辐射状电网发生单相接地故障时,单端行波故障测距的关键是正确识别来自故障点的反射波、对端母线的反射波及健全线路的反射波。行波零模波速具有较强的依频特性,而线模波速较稳定。由于零模波速的不稳定性,当取其为固定值时,导致基于线模、零模波速差的单端行波故障测距精确度不够。针对此问题,首先利用神经网络训练学习,估算出零模波速,基于线模、零模波速差得到初步故障距离,以此初步故障距离从线模行波突变波头中找出故障点反射波头及对端母线反射波头,再把线模波速代入相应的测距公式得到精确故障距离。利用PSCAD/EMTDC搭建仿真模型,对不同的故障情况进行仿真,均验证了该方法具有较高的测量精度和可靠性。

关键词(KeyWords)： 波速差;小波变换;神经网络;波头识别;故障测距

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51107143);; 中央高校基本科研业务费专项资金资助(2011QNA19)~~

作者(Author): 梁睿;孙式想;

Email:

DOI: 10.13335/j.1000-3673.pst.2013.03.011

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