基于Hilbert-Huang变换的配电馈线接地故障测距 *

doi:10.11985/2020.04.002

摘要/Abstract

摘要：

快速、准确地定位配电线路故障点对提高供电可靠性、实现智能电网具有重要的意义。提出一种新的接地故障行波信号时频分析方法,对故障电流的线模分量和零模分量进行经验模态分解(Empirical mode decomposition, EMD),得到多阶平稳的固有模态函数(Intrinsic mode function, IMF),第一阶IMF含有较高的频率分量,能反映信号的突变,对第一阶IMF进行Hilbert-Huang变换,得到信号的瞬时频率。由时频图中的瞬时频率检测出行波波头的到达时刻,通过线模和零模波头之间的时间差计算出故障距离。仿真分析表明,该算法能准确检测故障距离,不受接地过渡电阻、短路时刻的影响。

关键词: 配电馈线, Hilbert-Huang变换, 行波, 故障测距, 接地故障

Abstract:

It is of great significance for power supply reliability and smart grid to locate the point of failure on distribution lines quickly and accurately. A new ground fault traveling-wave signal time-frequency analysis method is put forward. It decomposes the line mode component and zero mode component of fault current based on empirical mode decomposition (EMD) to get multi-stage stable intrinsic mode function (IMF). The first IMF contains more frequency components which can reflect the mutation of signal. Transform the first IMF with Hilbert-Huang transformation to get the instantaneous frequency of signal. And then check the moment when the head wave of traveling wave arrived using the instantaneous frequency in the fig of time-frequency. Account the fault distance based on the time difference between the moment of head wave arrived of line mode component and zero mode component. Simulation analysis proves that this method is able to accurately account the distance of fault in the influence of the random factors such as fault transition resistance and the moment of fault.

Key words: Distribution feeder, Hilbert-Huang transformation, traveling wave, fault location, ground fault

中图分类号:

TM773

王艳松, 徐海亮, 衣京波, 梁硕. 基于Hilbert-Huang变换的配电馈线接地故障测距 ^*[J]. 电气工程学报, 2020, 15(4): 18-26.

WANG Yansong, XU Hailiang, YI Jingbo, LIANG Shuo. Distribution Feeder Grounding Fault Location Based on Hilbert-Huang Transform[J]. Journal of Electrical Engineering, 2020, 15(4): 18-26.

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短路电阻/Ω	故障初相角/(°)	线模波波头到达时刻/s	零模波波头到达时刻/s	实际故障位置/km	测距结果/km
1	90	0.125 005	0.125 007	1	1.020 7
1	90	0.125 010	0.125 015	2	2.082 3
10	90	0.125 010	0.125 015	2	2.082 3
100	90	0.125 010	0.125 015	2	2.082 3
200	90	0.125 010	0.125 015	2	2.082 3
200	90	0.125 010	0.125 015	2	2.082 3
300	60	0.125 010	0.125 015	2	2.082 3
500	60	0.125 015	0.125 023	3	3.062 2
500	30	0.125 021	0.125 031	4	4.123 8
300	30	0.125 026	0.125 038	5	5.144 5

短路电阻/Ω	故障初相角/(°)	线模波头到达时刻/s	零模波头到达时刻/s	实际故障位置/km	测距结果/km
1	90	0.125 005	0.125 007	1	1.020 7
1	90	0.125 010	0.125 015	2	2.082 3
10	90	0.125 010	0.125 015	2	2.082 3
100	90	0.125 010	0.125 015	2	2.082 3
200	90	0.125 010	0.125 015	2	2.082 3
100	30	0.125 010	0.125 015	2	2.082 3
100	60	0.125 010	0.125 015	2	2.082 3
200	90	0.125 015	0.125 024	3	3.103 1
50	90	0.125 021	0.125 031	4	4.123 8
50	90	0.125 026	0.125 039	5	5.185 4