电力系统及其自动化学报2017，Vol.29Issue(2)：101-106,128,7.DOI:10.3969/j.issn.1003-8930.2017.02.017
基于高频分量相关度分析的故障选线方法
Fault Line Selection Method Based on Correlation Analysis of High-frequency Components
刘谋海 1方涛 1姜运 1曾祥君 1黄宇浩 1韦根1
作者信息
- 1. 长沙理工大学智能电网运行与控制湖南省重点实验室,长沙 410114
- 折叠
摘要
Abstract
To overcome the poor effect of fault line selection by simply using zero-sequence current,this paper introduc-es a new method of fault line selection based on correlation analysis of the high frequency components in zero-sequence current. First,the pure fault components are obtained by processing the zero-sequence current extracted from every line by recorders installed at the end of lines. Then,the corresponding high frequency components are obtained by empirical mode decomposition(EMD)and instantaneous freguency analysis. Because the wave forms of high-frequency compo-nents in non-fault lines are similar under single-phase grounding fault,while the wave forms between the fault line and non-fault lines are significantly different,the correlation coefficients between the wave forms can be utilized to select the fault line. Simulation results show that the proposed method is simple,and it has strong anti-interference ability without setting. Moreover,the fault line can be selected without being affected by transition resistance or fault distance, and the proposed method can overcome the interference due to system noise and nonsymmetrical components,which further improves the margin of protection.关键词
故障选线/高频分量/瞬时频率/相关度/配电网Key words
fault line selection/high-frequency component/instantaneous frequency/correlation analysis/power dis-tribution network分类
信息技术与安全科学引用本文复制引用
刘谋海,方涛,姜运,曾祥君,黄宇浩,韦根..基于高频分量相关度分析的故障选线方法[J].电力系统及其自动化学报,2017,29(2):101-106,128,7.
