| 引用本文: | 任琴,舒勤,刘勇.基于对称注入法反射波特征提取的配电网故障测距算法[J].电力系统保护与控制,2015,43(24):19-25.[点击复制] |
| REN Qin,SHU Qin,LIU Yong.A fault location algorithm for distribution network based on extracting features from the reflected wave of symmetrical injection method[J].Power System Protection and Control,2015,43(24):19-25[点击复制] |
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| 摘要: |
| 针对架空线配电网单相接地故障测距问题，分析了故障点反射波信号和线路行波传输特性，提出了一种向故障线路三相对称注入高压脉冲获取故障特征波的方法。采用母线端首次检测到故障点零模反射波的时间和波前特征参数，作为BP神经网络的输入变量，建立故障测距模型。在提取零模反射波到达时间和波前特征参数时，对行波数据进行小数定标规范化和极值归一化处理，以消除故障距离以外因素对神经网络输入变量的影响。最后采用PSCAD仿真和Matlab编程运行，结果表明该方法不受故障分支、接地电阻影响，可有效测定故障距离。 |
| 关键词: 配电网 对称注入法 零模反射波 神经网络 故障测距 |
| DOI：10.7667/j.issn.1674-3415.2015.24.004 |
| 投稿时间：2015-03-02修订日期：2015-06-02 |
| 基金项目:四川省科技支撑计划项目(2014GZ0083，20140010) |
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| A fault location algorithm for distribution network based on extracting features from the reflected wave of symmetrical injection method |
| REN Qin,SHU Qin,LIU Yong |
| (School of Electrical Engineering and Information, Sichuan University, Chengdu 610065, China;Aba Electric Power Company, State Grid Corporation of China, Aba 623200, China) |
| Abstract: |
| According to the analysis on the reflected wave at the single-phase-to-ground fault point and traveling-wave transmission characteristics of lines in overhead-line distribution network, the method that symmetrical high-voltage pulse is injected into three phases is proposed to acquire the zero-mode waves. Then the time of zero-mode reflected waves reaching the bus bar and the characteristic parameters of wavefront are used as input variables of BP neural network location model of single-phase ground fault. Before extracting the arrival time of the fault zero-mode reflected waves and the waves’ characteristic parameters, this paper respectively adopts the fractional scaling standardization and normalization of extremum to eliminate the influence of the factors except fault distance on the neural network input vector. PSCAD simulation and Matlab programming operation is used, the results show that the method is not affected by branch lines and grounding resistance, which can effectively measure the fault distance. |
| Key words: distribution network symmetrical injection method zero-mode reflected waves ANN fault location |
