基于HHT和SVM的谐振接地系统故障选线新方法  

New approach to detect fault line in resonant grounded system based on HHT and SVM

作　　者：郭谋发[1] 王鹏[1] 杨耿杰[1] 

机构地区：[1]福州大学电气工程与自动化学院,福建福州350108

出　　处：《电工电能新技术》2014年第9期68-73,80,共7页Advanced Technology of Electrical Engineering and Energy

摘　　要：谐振接地系统不同类型单相接地故障的暂态过程差异性较大,难有普适的暂态选线方法。分析谐振接地系统在三种典型故障条件下的暂态特征,将单相接地故障类型分为强接地故障、小角度接地故障和弱接地故障;定义频谱能量比例因子P、暂态因子T和Hilbert时频熵S等故障特征量,并采用支持向量机对故障进行分类。对不同类型的故障构造相应的选线判据,实现有针对性的接地选线。仿真结果表明,该选线方法能适应各种故障条件及影响因素,具有选线准确、裕度高等特点。The transient processes of different types signal-phase-to-earth fault in resonant grounded system are dif-ferent, thus it is very difficult to find a generally applicable method .By analyzing the transient characteristic of res-onant grounded system in three special fault conditions , the single-phase-to-earth fault is divided into strong ground-ed fault, small-angle grounded fault and weak grounded fault .Define spectrum energy scaling factor P, transient factor T and Hilbert time-frequency entropy S as the fault characteristics , and use support vector machine to classify fault category .Build up the proper line detection criterions for different fault categories to achieve targeted ground-ing line detection .Simulation results show that the proposed approach for fault line detection could adapt to various fault conditions and influence factors and has the characteristics of high margin and veracity .

关 键 词：谐振接地系统 接地选线 故障分类 故障暂态特征 HHT SVM 

分 类 号：TM711[电气工程—电力系统及自动化]