零模检测波速度的迭代提取及其在配电网单相接地故障定位中的应用

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摘要提出了零模检测波速度的迭代提取算法, 并基于此给出了配电网单相接地故障定位方法。针对零模波速度随频率变化大的问题, 本文通过分析发现选择小波变换合适大尺度下模极大值标定波头到达时刻可使零模检测波速度更稳定, 并分析得出可利用波头到达时刻频率分量与故障距离的关系、零模波速度与频率的关系构造迭代公式提取零模检测波速度, 提高了零模波速度求取的准确性及抗干扰能力。基于此, 提出基于模量行波传输时间差的配电网单相接地故障双端定位方法, 该方法无需时间同步, 不仅可定位主干线路故障点, 还可定位分支线路故障点。通过PSCAD/EMTDC对该方法进行仿真, 结果证实了其有效性与实用性。

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	唐金锐
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	娄玲娇
	陈坤燚

关键词 ：配电网, 故障定位, 零模, 小波, 迭代

Abstract：This paper presents an iterative algorithm to extract detected zero-mode wave velocity and a new method for single phase-to-ground fault location in distribution networks is given based on it. About the speed instability of zero-mode component, the paper discovers that the detected zero-mode wave velocity would be more stability by selecting appropriate large wavelet scale to detect the arrival time of traveling wave. Meanwhile, an iterative algorithm is designed based on the correspondence of the frequency component at the arrival time of traveling wave to fault distance and the correspondence of zero mode velocity to the frequency. It can improve the accuracy and anti-interference ability for detected zero-mode wave velocity extraction. Based on the iterative algorithm, the paper presents a new two terminal method of single phase-to-ground fault location based on the gap between zero mode and aerial mode traveling wave propagation time. This method does not need time synchronization, not only can locate the fault position at trunk lines, but it can also locate the fault position at braches. The effectiveness and practicability of the method are verified by the PSCAD/EMTDC simulation results.

Key words： Distribution networks fault location zero mode wavelet iteration

收稿日期: 2011-09-28 出版日期: 2014-03-25

PACS:

TM732

基金资助:国家自然科学基金资助项目(50877031, 50837002, 51177058)。

作者简介: 唐金锐男, 1986年生, 博士研究生, 研究方向为电力系统继电保护与控制、电力系统状态监测与配电网故障定位。尹项根男, 1954年生, 博士, 教授, 研究方向为电力系统继电保护, 变电站自动化及安全稳定控制。

引用本文:

唐金锐, 尹项根, 张哲, 戚宣威, 娄玲娇, 陈坤燚. 零模检测波速度的迭代提取及其在配电网单相接地故障定位中的应用[J]. 电工技术学报, 2013, 28(4): 202-211. Tang Jinrui, Yin Xianggen, Zhang Zhe, Qi Xuanwei, Lou Lingjiao, Chen Kunyi. Iterative Extraction of Detected Zero-Mode Wave Velocity and Its Application in Single Phase-to-ground Fault Location in Distribution Networks. Transactions of China Electrotechnical Society, 2013, 28(4): 202-211.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2013/V28/I4/202

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