配电网单相接地故障行波定位新方法  

New Method of Single Phase-to-ground Fault Location Based on Traveling Wave in Distribution Networks

作　　者：洪亚[1] 谭阳红[1] 易汗林 文娟[1] 姜书燕 HONG Ya TAN Yanghong YI Hanlin WEN Juan JIANG Shuyan(College of Electrical and Information Engineering, Hunan University, Changsha 410082, China)

机构地区：[1]湖南大学电气与信息工程学院,长沙410082

出　　处：《电力系统及其自动化学报》2017年第2期14-20,共7页Proceedings of the CSU-EPSA

基　　金：国家重点基础研究发展计划(973计划)资助项目(2012CB215106);国家自然科学基金资助项目(61102039);教育部新世纪优秀人才支持计划资助项目(NCET-11-0130);高校博士学科点专项科研基金资助项目(20120161110009);湖南省自然科学基金资助项目(14JJ7029);中央高校基金和湖南省教改课题资助项目

摘　　要：针对零、线模速度差和时间差行波定位原理中零模波速度难以确定的问题,提出了在无需时间同步的情况下,利用线路两端信息融合在线实时求取零模波速度的算法和一种配电网单相接地故障行波定位新方法。分析了行波分量在线路上的传播特性,将零、线模行波通过S变换后,发现在零、线模行波频率分别为50 k Hz和500 k Hz的分量下标定初始波头的到达时间,具有较高的灵敏度和稳定性。根据零模波速度与定位公式之间的关系,找出故障点所在最小区域,将该最小区域包含的线路区段分解成多组T型线路进行了故障定位。通过PSCAD/EMTDC进行了全面系统的仿真验证,结果表明所求得的零模波速度和定位方法具有较高的准确度,具有一定工程价值。Considering that it is difficult to determine the zero-mode wave velocity using time difference and velocity difference between zero-mode and line-mode traveling waves adopted in the traveling wave location principle, an online real-time zero-mode wave velocity algorithm is proposed using information fusion at the two ends, and a single phase-toground fault traveling wave location method is put forward in distribution networks. The propagation characteristics of traveling-wave components on the line are analyzed, and it is found that the arrival time of inceptive traveling wave has better sensitivity and stability when the traveling wave frequencies of zero-mode and line-mode are 50 kHz and 500 kHz, respectively, after S-transform. The correlation of zero-mode wave velocity and location formula is deduced, and the minimum area including fault locations is found, where line sectioning is decomposed into T type to conduct fault location. The simulation in PSCAD/EMTDC shows that the zero-mode wave velocity and location method are accurate, and the result has engineering significance.

关 键 词：S变换 行波 零模波速度 故障定位 配电网 

分 类 号：TM711[电气工程—电力系统及自动化]