电气技术  2018, Vol. 19 Issue (3): 37-43    DOI:
研究与开发 |
配电网高阻接地故障时频特征SVM分类识别方法
张君琦1, 杨帆2, 郭谋发1
1. 福州大学电气工程与自动化学院,福州 350116;
2. 国网南平供电公司,福建 南平 353000;
High impedance ground fault detection based on time-frequency characteristics and SVM
Zhang Junqi1, Yang Fan2, Guo Moufa1
1. College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350116;
2. State Grid Nanping Electric Power Supply Company, Nanping, Fujian 353000;
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摘要 高阻接地故障(HIF)发生时的故障点接地电阻较大,并常伴随着电弧熄灭与重燃,引起的故障电流很小且随机性强。由于故障时电压、电流突变量不明显,常规保护难以准确动作,所以辨识较为困难。本文提出了LCD带通滤波结合支持向量机(SVM)的配电网高阻接地故障分类识别方法,将高阻接地故障与电容投切、负荷投切、励磁涌流等暂态工况进行区分。该算法采用LCD带通滤波构造主变低压侧电流波形的时频矩阵,求取各频带标准差作为特征向量,将特征向量输入SVM以实现故障分类识别。
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关键词 配电网高阻接地故障LCD带通滤波支持向量机    
Abstract:When the high impedance ground fault (HIF) occurs, the grounding resistance of the fault point is high, and it is often accompanied by arc extinction and restriking. The fault current is very small and strongly random. Detection of HIF is generally difficult by the conventional over-current protection devices, because they cannot draw enough current to operate the devices. In this paper, a new HIF detection method that uses LCD band-pass filter and support vector machine (SVM) is presented. Using this method, HIF can be discriminated from transients such as capacitor switching, load switching, inrush current. LCD band-pass filter is used for obtaining the time-frequency matrices of current waveforms of the bus line. The feature vectors are the standard deviation of each frequency band, and SVM is used for classification.
Key wordsMV distribution networks    HIF    LCD band-pass filter    SVM   
收稿日期: 2017-09-18      出版日期: 2018-03-19
作者简介: 张君琦(1993-),女,硕士研究生,主要研究方向为配电网及其自动化技术。
引用本文:   
张君琦, 杨帆, 郭谋发. 配电网高阻接地故障时频特征SVM分类识别方法[J]. 电气技术, 2018, 19(3): 37-43. Zhang Junqi, Yang Fan, Guo Moufa. High impedance ground fault detection based on time-frequency characteristics and SVM. Electrical Engineering, 2018, 19(3): 37-43.
链接本文:  
http://dqjs.cesmedia.cn/CN/Y2018/V19/I3/37