基于暂态高频分量的故障投票选线方法

doi:10.16180/j.cnki.issn1007-7820.2022.07.011

摘要/Abstract

摘要：

针对现有小电流系统单相接地故障暂态选线特征信息提取、处理以及选线精度的问题,文中对故障进行暂态特征分析,发现各线路暂态零序电流中高频分量具有明显差异。据此结果,文中提出了一种基于暂态零序电流高频分量的波形相似性的投票选线方法。结合VMD算法和巴氏距离算法,分解各条线路的零序电流,得出暂态高频分量,进而求得各线路间暂态高频分量的巴氏系数。然后对系数矩阵采用初步投票与k值检验的方法进行投票,从而判断出故障线路。不同故障情况下的仿真结果表明该方法简单可靠,选线精度及可信度高,具有广泛的适用性和一定的抗干扰性。

关键词: 小电流接地系统, 单相接地故障, 暂态零序电流, 高频分量, VMD, 巴氏距离, 波形相似性, 投票机制

Abstract:

In view of the problems of extraction and processing of transient line selection characteristics of single-phase grounding faults in existing low-current systems, as well as line selection accuracy, this study analyzes the transient characteristics of the faults and finds that the high-frequency components of the transient zero-sequence currents of various lines have obvious differences. Accordingly, a voting line selection method based on waveform similarity of high-frequency components of transient zero sequence current is proposed. Combined with VMD algorithm and Bhattacharyya distance algorithm, the zero sequence current of each line is decomposed to obtain the transient high frequency components, and then the Bhattacharyya coefficients of the transient high frequency components among the lines are obtained. The fault line is voted by the method of preliminary voting and k-value test on the coefficient matrix. The simulation results under different fault conditions show that the method is simple and reliable, with high accuracy and credibility of line selection, wide applicability and certain anti-interference.

Key words: small current grounding system, single phase ground fault, transient zero sequence current, high frequency components, VMD, Bhattacharyya distance, waveform similarity, voting mechanis

中图分类号:

TP277

吴君,谢逸飞,张长森. 基于暂态高频分量的故障投票选线方法[J]. 电子科技, 2022, 35(7): 64-70.

WU Jun,XIE Yifei,ZHANG Changsen. Fault Voting Method Based on Transient High Frequency Components[J]. Electronic Science and Technology, 2022, 35(7): 64-70.

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系数	l₁	l₂	l₃	l₄
M₁_j	-	0.856 1	0.847 9	0.110 1
M₂_j	0.843 5	-	0.812 4	0.114 7
M₃_j	0.845 1	0.803 7	-	0.128 5
M₄_j	0.115 1	0.117 3	0.119 2	-

假设线路	min(M_ij)	初步投票结果
l₁	M₁₄	l₄
l₂	M₂₄	l₄
l₃	M₃₄	l₄
l₄	M₄₁	l₁

假设线路	初步结果	min(G)	最终结果
l₁	l₄	7.701>3	l₄
l₂	l₄	7.083>3	l₄
l₃	l₄	6.254>3	l₄
l₄	l₁	1.019<3	l₄

故障初相角/(°)	故障电阻 /Ω	假设线路	初步结果	min(G)	最终结果
30	10	l₁	l₄	7.753>3	l₄
		l₂	l₄	7.428>3	l₄
		l₃	l₄	7.372>3	l₄
		l₄	l₁	1.007<3	l₄
30	50	l₁	l₄	6.971>3	l₄
		l₂	l₄	7.316>3	l₄
		l₃	l₄	7.279>3	l₄
		l₄	l₂	1.103<3	l₄
60	10	l₁	l₄	7.907>3	l₄
		l₂	l₄	6.961>3	l₄
		l₃	l₄	7.359>3	l₄
		l₄	l₂	1.301<3	l₄
90	10	l₁	l₄	7.637>3	l₄
		l₂	l₄	7.936>3	l₄
		l₃	l₄	7.572>3	l₄
		l₄	l₂	1.273<3	l₄

选线方法	故障线路	正确率	综合正确率
小波分解法	l₁	92.31%	91.98%
	l₂	91.97%
	l₃	91.64%
	l₄	92.01%
EMD 分解法	l₁	93.42%	93.45%
	l₂	92.86%
	l₃	93.47%
	l₄	94.03%
基于暂态高频分量的投票选线法	l₁	97.62%	97.95%
	l₂	98.03%
	l₃	98.14%
	l₄	97.98%