配电网间歇性电弧接地故障选线方法

doi:10.11930/j.issn.1004-9649.2013.8.108.3

摘要/Abstract

摘要： 配电网单相接地故障选线问题由来已久,现有的研究成果大多是针对单相永久性接地故障的。而在实际配电网中,不稳定电弧和间歇性电弧接地等非永久性接地故障也极易发生,且难于选线。发生非稳定电弧接地故障时会带来大量的高频分量,本文提出一种自适应陷波滤波器算法,用来提取线路谐波电流的5次谐波。该方法通过调节自身参数来自动跟踪信号的变化,从而实现了对5次谐波信号实时、准确的提取。仿真结果表明,该选线方法在发生非永久性接地故障时能正确地选出故障线路,其原理简单、可靠。

关键词: 配电网, 间歇性电弧接地, 故障选线, 自适应陷波滤波器, 5次谐波

Abstract: Single phase-to-ground fault-detection for distribution system has been a challenge for many years, but the research has been mainly concentrated on permanent grounding fault, which is not general. Actually, the unstable arc-grounding and intermittent arc-grounding faults, which are kind of non-permanent grounding faults, are most likely to occur in the power system. When non-permanent arc-grounding fault happens, many high frequency components will be produced correspondingly. An adaptive notch filter (ANF) algorithm is introduced in this paper to extract the fifth harmonics signal of zero-sequence current . The algorithm can track the change of signal automatically by adjusting its own parameters. Thus it can accurately extract the real-time fifth harmonics signal. Empirical results show that the proposed method can find the fault feeder correctly when non-permanent grounding fault occurs. The principle is simple and reliable.

Key words: distribution system, intermittent arc-grounding, selection of fault feeder, ANF, fifth harmonics

中图分类号:

TM64

张志霞, 张欣雨. 配电网间歇性电弧接地故障选线方法[J]. 中国电力, 2013, 46(8): 108-111.

ZHANG Zhi-xia, ZHANG Xin-yu. Selection Method of Intermittent Arc-grounding Fault Based on an Adaptive Notch Filter[J]. Electric Power, 2013, 46(8): 108-111.

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https://www.electricpower.com.cn/CN/Y2013/V46/I8/108

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