Fault Location in Distribution Networks Based on Centroid Frequency and BP Neural Networks
Zhou Niancheng1, Xiao Shuyan1, Yu Yinshu2, Wang Qianggang1
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China; 2. Ningbo Power Supply Company of State Grid Zhejiang Electric Power Company Ningbo 315000 China
Abstract：Low frequency component contents of zero-sequence currents increase with the growth of fault distance, which makes current spectrums appear left-shift tendency. In addition, the closer fault closing angle approaches to 90°, the more high frequency component contents of zero-sequence currents are, which opposites to the case that transient resistance increase. Hereby, this paper proposes a frequency domain fault location method based on centroid frequency. Centroid frequency can be used to describle current spectrums entire distribution feature, further, the influence on current spectrums by transient resistance, fault distance and fault closing angle can be describled by centroid frequency. By utilizing BPNN (back propagation neural networks), the mapping relationship can be simulated between transient resistance, fault distance, fault closing angle and centroid frequency, which realizes fault loaction. In the case that centroid frequency fault distance curves are not monotonous, an assitant criteria is given, further, final resulsts are obtained by centroid frequency fault distance curves combined with the assitant criteria. Results prove that the method proposed by this paper has a distinct advantage than other frequency domain methods in the terms of fault location in hybrid line or feeder line with branches and apply to complex structures in distribution networks. Moreover, accurate fault location results can be obtained when training samples lack in quantity and accuracy.
周念成, 肖舒严, 虞殷树, 王强钢. 基于质心频率和BP神经网络的配网故障测距[J]. 电工技术学报, 2018, 33(17): 4154-4166.
Zhou Niancheng, Xiao Shuyan, Yu Yinshu, Wang Qianggang. Fault Location in Distribution Networks Based on Centroid Frequency and BP Neural Networks. Transactions of China Electrotechnical Society, 2018, 33(17): 4154-4166.
[1] 何连杰, 史常凯, 闫卓, 等. 基于广义S变换能量相对熵的小电流接地系统故障区段定位方法[J]. 电工技术学报, 2017, 32(8): 274-280. He Lianjie, Shi Changkai, Yan Zhuo, et al.A fault section location method for small current neutral grounding system based on energy relative entropy of generalized S transform[J]. Transactions of China Electrotechnical Society, 2017, 32(8): 274-280. [2] 康忠健, 田爱娜, 冯艳艳, 等. 基于零序阻抗模型故障特征的含分布式电源配电网故障区间定位方法[J]. 电工技术学报, 2016, 31(10): 214-221. Kang Zhongjian, Tian Aina, Feng Yanyan, et al.Fault section locating method based on zero sequence impedance model fault feature in distribution network with distributed generators[J]. Transactions of China Electrotechnical Society, 2016, 31(10): 214-221. [3] 于华楠, 马聪聪, 王鹤. 基于压缩感知估计行波自然频率的输电线路故障定位方法研究[J]. 电工技术学报, 2017, 32(23): 140-148. Yu Huanan, Ma Congcong, Wang He.Transmission line fault location method based on compressed sensing estimation of traveling wave natural frequencies[J]. Transactions of China Electrotechnical Society, 2017, 32(23): 140-148. [4] Salun R H, Resener M, Filomena A D, et al.Extended fault-location formulation for power distribution systems[J]. IEEE Transactions on Power Delivery, 2009, 24(2): 508-516. [5] 郑涛, 潘玉美, 郭昆亚, 等. 基于节点阻抗矩阵的配电网故障测距算法[J]. 电网技术, 2013, 37(11): 3233-3240. Zheng Tao, Pan Yumei, Guo Kunya, et al.A nodal impedance matrix based fault location algorithm for distribution network[J]. Power System Technology, 2013, 37(11): 3233-3240. [6] 束洪春, 邬乾晋, 张广斌, 等. 基于神经网络的单端行波故障测距方法[J]. 中国电机工程学报, 2011, 31(4): 85-92. Shu Hongchun, Wu Qianjin, Zhang Guangbin, et al.Single terminal traveling wave fault location method based on ANN[J]. Proceedings of the CSEE, 2011, 31(4): 85-92. [7] 张峰, 梁军, 李建超, 等. 基于初始反极性行波检测的单端故障测距算法[J]. 电力系统自动化, 2013, 37(4): 108-113. Zhang Feng, Liang Jun, Li Jianchao, et al.Single earthed-fault location algorithm based on detection of initial reverse polarity traveling wave[J]. Automation of Electric Power Systems, 2013, 37(4): 108-113. [8] 林圣, 何正友, 陈鉴, 等. 基于行波时频特征的单端故障测距方法[J]. 电网技术, 2012, 36(1): 258-264. Lin Sheng, He Zhengyou, Chen Jian, et al.A single terminal fault location method based on tune-frequency characteristic of traveling wave[J]. Power System Technology, 2012, 36(1): 258-264. [9] 徐铭铭, 肖立业, 林良真. 基于零模行波衰减特性的配电线路单相接地故障测距方法[J]. 电工技术学报, 2015, 30(14): 397-404. Xu Mingming, Xiao Liye, Lin Liangzhen.A fault location method for the single-phase-to-earth fault in distribution system based on the attenuation characteristic of zero-mode taveling wave[J]. Transactions of China Electrotechnical Society, 2015, 30(14): 397-404. [10] 高效海, 苏晓龙. 一种新的单端行波测距方法[J]. 电力系统保护与控制, 2016, 44(12): 87-91. Gao Xiaohai, Su Xiaolong.A new method for single-ended traveling wave fault location[J]. Power System Protection and Control, 2016, 44(12): 87-91. [11] 姜杰, 王鹏, 黄正炫, 等. 基于改进线路参数模型的配网电缆单相接地测距方法[J]. 电网技术, 2012, 36(5): 185-189. Jiang Jie, Wang Peng, Huang Zhengxuan, et al.Fault location of single-phase earth for power cable in distribution network based on improved cable line parameter model[J]. Power System Technology, 2012, 36(5): 185-189. [12] 林富洪, 曾惠敏. 基于分布参数模型的高压输电线路单相接地故障单端测距方法[J]. 电网技术, 2011, 35(4): 201-205. Lin Fuhong, Zeng Huimin.One-terminal fault location of single-phase to earth fault based on distributed parameter model of HV transmission line[J]. Power System Technology, 2011, 35(4): 201-205. [13] 贾清泉, 王振宇, 王宁, 等. 基于参数辨识的消弧线圈接地电网单相接地故障测距方法[J]. 电工技术学报, 2016, 31(23): 77-85. Jia Qingquan, Wang Zhenyu, Wang Ning, et al.A single-phase-to-ground fault locating algorithm for arc-suppression-coil earthed power distribution systems based on parameter estimation[J]. Transactions of China Electrotechnical Society, 2016, 31(23): 77-85. [14] 梁睿, 杨学君, 薛雪, 等. 零序分布参数的单相接地故障精确定位研究[J]. 电工技术学报, 2015, 30(12): 472-479. Liang Rui, Yang Xuejun, Xue Xue, et al.Study of accurate single-phase grounding fault location based on distributed parameter theory using data of zero sequence components[J]. Transactions of China Electrotechnical Society, 2015, 30(12): 472-479. [15] 康小宁, 索南加乐. 求解频域参数方程的双端故障测距原理[J]. 电力系统自动化, 2005, 29(10): 16-20. Kang Xiaoning, Sounan Jiale.Frequency domain fault location method based on the transmission line parameter identification using two terminal data[J]. Automation of Electric Power Systems, 2005, 29(10): 16-20. [16] 康小宁, 索南加乐. 基于参数识别的单端电气量频域法故障测距原理[J]. 中国电机工程学报, 2005, 25(2): 22-27. Kang Xiaoning, Suonan Jiale.Frequency domain method of fault location based on parameter identification-using one terminal data[J]. Proceedings of the CSEE, 2005, 25(2): 22-27. [17] 张姝, 杨健维, 何正友, 等. 基于线路暂态重心频率的配电网故障区段定位[J]. 中国电机工程学报, 2015, 35(10): 2463-2470. Zhang Shu, Yang Jianwei, He Zhengyou, et al.Fault location of the distribution network based on transient center frequency[J]. Proceedings of the CSEE, 2015, 35(10): 2463-2470. [18] 汤涛, 黄纯, 江亚群, 等. 基于高低频段暂态信号相关分析的谐振接地故障选线方法[J]. 电力系统自动化, 2016, 40(16): 105-111. Tang Tao, Huang Chun, Jiang Yaqun, et al.Fault line selection method in resonant earthed system based on transient signal correlation analysis under high and low frequencies[J]. Automation of Electric Power Systems, 2016, 40(16): 105-111. [19] 赵建文, 刘永佳, 梁静, 等. 基于改进FastICA及Romanovsky准则的故障选线[J]. 中国电机工程学报, 2016, 36(19): 5209-5218. Zhao Jianwen, Liu Yongjia, Liang Jing, et al.Fault line selection based on improved FastICA and Romanovsky guidelines[J]. Proceedings of the CSEE, 2016, 36(19): 5209-5218. [20] 薛永端, 徐丙垠, 冯祖仁, 等. 小电流接地故障暂态方向保护原理研究[J]. 中国电机工程学报, 2003, 23(7): 51-56. Xue Yongduan, Xu Bingyin, Feng Zuren, et al.The principle of directional earth fault protection using zero sequence transients in non-solid earthed network[J]. Proceedings of the CSEE, 2003, 23(7): 51-56. [21] 刘宝稳, 马宏忠. 零序电压产生机理及过渡电阻测量和选相方法[J]. 电网技术, 2015, 39(5): 1444-1449. Liu Baowen, Ma Hongzhong.Transition resistance measurement andfault phase selection undersingle-phase ground fault based onproducing mechanism of zero-sequence voltage[J]. Power System Technology, 2015, 39(5): 1444-1449.
2018, Vol. 33 
