引用本文:朱玉勇,吕飞鹏,廖小君,李垚逸,臧天磊.基于路图GFT谱相似度的小电流接地系统故障选线[J].电力自动化设备,2023,43(11):89-94,116
ZHU Yuyong,Lü Feipeng,LIAO Xiaojun,LI Yaoyi,ZANG Tianlei.Fault line selection of small current grounding system based on GFT spectral similarity of path graph[J].Electric Power Automation Equipment,2023,43(11):89-94,116
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基于路图GFT谱相似度的小电流接地系统故障选线
朱玉勇1, 吕飞鹏1, 廖小君2, 李垚逸1, 臧天磊1
1.四川大学 电气工程学院,四川 成都 610065;2.国网四川省电力公司技能培训中心,四川 成都 610072
摘要:
针对现有小电流接地系统发生单相接地故障时的选线问题,提出一种基于路图图傅里叶变换(GFT)谱相似度的故障选线方法。对各出线暂态零序电流进行路图GFT分析,发现非故障线路的路图GFT谱相似,与故障线路有明显差异。通过综合离散弗雷歇距离和综合余弦相似度2个维度综合表征故障线路和非故障线路的路图GFT谱差别,从而筛选出故障线路。仿真结果表明,所提方法实现简单,选线可靠性高,且不易受电网拓扑、过渡电阻、故障初始条件等因素的影响。
关键词:  小电流接地系统  故障选线  图傅里叶变换  离散弗雷歇距离  余弦相似度
DOI:10.16081/j.epae.202306020
分类号:TM77
基金项目:国家自然科学基金资助项目(51907097)
Fault line selection of small current grounding system based on GFT spectral similarity of path graph
ZHU Yuyong1, Lü Feipeng1, LIAO Xiaojun2, LI Yaoyi1, ZANG Tianlei1
1.College of Electrical Engineering, Sichuan University, Chengdu 610065, China;2.State Grid Sichuan Technical Training Center, Chengdu 610072, China
Abstract:
Aiming at the problem of line selection when a single-phase grounding fault occurs in the existing small current grounding system, a fault line selection method based on the graph Fourier transformation(GFT) spectrum similarity of path graph is proposed. The path graph GFT analysis of the transient zero-sequence current of each outgoing line is carried out. The analytical results show that the spectral GFT of the path graph of the non-fault lines is similar while different from that of the fault line. The difference between GFT spectrum of the fault line and the non-fault line is comprehensively characterized by the synthetic discrete Fréchet distance and the synthetic cosine similarity, so as to screen out the fault line. The simulative results show that the proposed method is simple to implement, has high reliability of fault line selection, and is not easily affected by factors such as grid topology, transition resistance and initial fault conditions.
Key words:  small current grounding system  fault line selection  graph Fourier transformation  discrete Fréchet distance  cosine similarity

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