基于S变换的故障选线新方法_张钧.pdf

第 31 卷 第 10 期 中 国 电 机 工 程 学 报 Vol.31 No.10 Apr.5, 2011 2011 年 4 月 5 日 Proceedings of the CSEE ©2011 Chin.Soc.for Elec.Eng. 109 文章编号：0258-8013 (2011) 10-0109-07 中图分类号：TM 71 文献标志码：A 学科分类号：470·40 基于 S 变换的故障选线新方法 张钧，何正友，贾勇 (西南交通大学电气工程学院，四川省 成都市 610031) Fault Line Identification Approach Based on S-transform ZHANG Jun, HE Zhengyou, JIA Yong (Department of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan Province, China) ABSTRACT: Based on studying the amplitude-frequency and 心度。仿真结果表明，提出的方法选线正确率高，选线信心 phase-frequency characteristic obtained from S-transform, a 度的定义合理。 fault line identification approach was proposed. Through 关键词：电力系统；小电流接地系统；故障选线；S 变换； applying the modulus and phase information of electric 零序电流比相；选线信心度 components at each frequency point obtained from S-transform, the characteristic frequency points were found by modulus 0 引言 comparison, and the fault line vote mechanism was constructed 中国配电网的中性点运行方式多为小电流接 by phase comparison. Through utilizing the modulus 地运行方式，在该方式下运行的配电网在馈线发生 information to reflect the reliability of phase information, the 单相接地故障时，系统仍可持续运行 1~2 h ，这极 vote confidence degree was defined. Through multi-sampling-points vote mechanism, the vote statistic 大地提高了供电的连续性，而单相接地故障时及时 diagram was formed. The vote statistic diagram was calculated 和准确地判定出故障馈线对于防止故障进一步扩 by fault line identification confidence degree (FLICD), which 大以及隔离故障、恢复供电具有重要意义。 was defined by Shannon fuzzy ent