暂态零序电荷-电压特征与支持向量机结合的谐振接地系统故障选线研究  

Fault line selection of resonant grounding system based on the characteristics of charge-voltage in the transient zero sequence and support vector machine

作　　者：张姝[1] 何正友[1] 王玘[1] 林圣[1] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031

出　　处：《电力系统保护与控制》2013年第12期71-78,共8页Power System Protection and Control

摘　　要：提出了一种暂态零序电荷-零序电压(Q-U)特征与支持向量机(SVM)相结合的配电网谐振接地系统故障选线方法。为解决配电网故障选线不可靠的问题,从配电网暂态故障特征出发,研究单相接地故障后馈线暂态零序电荷与零序电压的故障特征关系。并以各条馈线零序电荷与电压相关系数作为选线特征输入量,通过结合支持小样本分类的支持向量机分类算法,建立了一套基于暂态零序Q-U特征的配电网故障选线流程。在PSCAD/EMTDC仿真软件下建立35 kV的谐振接地系统模型,大量仿真结果表明该方法不受故障距离,故障时刻的影响,特别在高阻,电弧等工况下仍然能够实现正确故障选线。A method of fault line selection in the resonant grounding system of distribution network based on the characteristics of the charge-voltage（Q-U） in the transient zero sequence and support vector machine（SVM） is proposed. In order to solve the problem that methods of fault line selection in the distribution network are unreliable, this paper researches the characteristic relationship between charge and voltage in the zero sequence from the point of the fault transients generated by phase-to-earth fault. With the classification algorithm of support vector machine that supports for small sample and taking the correlation coefficients of the charge and voltage in the zero sequence of every feeder as the characteristic input, a set of processes of the fault line selection in the distribution network based on the characteristics of the charge and voltage in the zero sequence is established. A 35 kV simulation model of resonant grounding system is established in the PSCAD/EMTDC. A large number of simulation results show that the method is not affected by fault distance and fault time. Especially, it is still be able to select fault line correctly in the condition of high impedance and arc fault.

关 键 词：谐振接地系统 单相接地故障 故障选线 零序电荷-零序电压 支持向量机 

分 类 号：TM862[电气工程—高电压与绝缘技术]