基于S变换的故障选线新方法  

Fault Line Identification Approach Based on S-transform

作　　者：张钧[1] 何正友[1] 贾勇[1] 

机构地区：[1]西南交通大学电气工程学院,四川省成都市610031

出　　处：《中国电机工程学报》2011年第10期109-115,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50877068);教育部博士点基金项目(200806130004)~~

摘　　要：在研究采用S变换提取的信号的幅频特性和相频特性基础上,提出了一种基于S变换的故障选线方法。利用S变换后电气量在各频率点的模值和相角信息,通过模值比较,找出特征频率点;通过相角比较,制定选线投票机制。利用特征频率点的模值来表征其相角信息的可靠性,定义了投票信心度。通过对多个采样点的投票机制,形成了投票统计图。利用仙农模糊熵定义选线信心度,通过选线信心度对投票统计图进行融合,在选出故障馈线的同时,给出选线信心度。仿真结果表明,提出的方法选线正确率高,选线信心度的定义合理。Based on studying the amplitude-frequency and phase-frequency characteristic obtained from S-transform, a fault line identification approach was proposed. Through applying the modulus and phase information of electric components at each frequency point obtained from S-transform, the characteristic frequency points were found by modulus comparison, and the fault line vote mechanism was constructed by phase comparison. Through utilizing the modulus information to reflect the reliability of phase information, the vote confidence degree was defined. Through multi-sampling-points vote mechanism, the vote statistic diagram was formed. The vote statistic diagram was calculated by fault line identification confidence degree （FLICD）, which was defined by Shannon fuzzy entropy. The vote statistic diagram was integrated by FLICD. Simulation results show that the proposed approach has high accuracy and the FLICD is defined reasonably.

关 键 词：电力系统 小电流接地系统 故障选线 S变换 零序电流比相 选线信心度 

分 类 号：TM71[电气工程—电力系统及自动化]