基于瞬时能量函数的故障选线新方法  

A novel fault line identification approach based on instantaneous energy function

作　　者：张钧[1] 刘洪星 何正友[3] 吴双[3] 

机构地区：[1]国网能源研究院,北京100052 [2]许继电气股份有限公司,河南许昌461000 [3]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》2012年第14期1-9,共9页Power System Protection and Control

基　　金：国家自然科学基金项目(50877068);教育部优秀新世纪人才支持计划项目(NCET-06-0799)~~

摘　　要：在研究了小电流接地系统发生单相接地故障时各个馈线瞬时功率特征的基础上,构造了一个基于S变换的瞬时能量函数。根据该能量函数,制定了选线判据,利用多点投票机制对线路是否故障进行了投票。最后,利用仙农模糊熵定义了选线信心度,通过选线信心度对多点投票结果进行了融合计算,给出了选线结果。在PSCAD/EMTDC中建立了一个4馈线的仿真模型,对提出的方法进行了验证。结果表明,该方法正确率高,抗过渡电阻能力强。对选线方法在电弧故障、谐波以及噪声环境下的适应性进行了研究,结果表明,该方法几乎不受电弧故障和谐波的影响,抗噪声能力强。By studying the characteristic of instantaneous energy in the case of single-phase-to-ground fault in small current neutral grounding system, the instantaneous energy function based on S-transform is constructed. According to the constructed energy function, the fault line identification criterion is given. Using multi-points vote mechanism, it is voted whether feeder is fault. Finally, the fault line identification confidence degree is defined by Shannon Fuzzy Entropy and is employed to calculate the multi-points vote results to. give fault line identification result. The 4 feeder distribution simulation model is established in PSCAD/EMTDC environment, and is used for verifying the proposed method. The results show that the method has high correctness, strong anti-transition resistance ability. The adaptability of the method is studied, which shows is that the proposed method is almost immune to arc fault and harmonic injection and possesses high anti-noise ability. This work is supported by National Natural Science Foundation of China （No. 50877068）. New Century Excellent Talents of Ministry of Education （No. NCET-06-0799）.

关 键 词：小电流接地系统 故障选线 S变换 瞬时能量 适应性 

分 类 号：TM862[电气工程—高电压与绝缘技术]