Coiflet小波和多目标优化在直流接地故障检测中的应用  

The application of Coiflet wavelet and multi-target optimization in the detection of DC system grounding fault

作　　者：柴玉华[1] 李辰月 蒋祝巍 

机构地区：[1]东北农业大学,哈尔滨150030 [2]国网黑龙江省电力有限公司鹤岗供电公司,黑龙江鹤岗154100

出　　处：《电测与仪表》2016年第2期62-66,共5页Electrical Measurement & Instrumentation

摘　　要：低频信号注入法是直流系统接地故障检测中经常用到的方法之一,优点是检测精度较高且操作方法简单,缺点是容易受到对地电容的影响而降低检测精度,文章针对这一缺陷,提出了基于coiflet小波分析的数据提取和多目标优化的数据处理结合的检测方法,该方法可以很大程度上减小对地电容对检测精度的影响,经过MATLAB平台的仿真验证,结果表明,该方法可以有效的提高直流系统接地故障检测的准确性。The low frequency signal injection method is one of the DC system grounding fault detection methods, and its detection accuracy is high and easy to operate. But its detection accuracy is also easy to be effected by the large amount of ground capacitance. To avoid this interference, this paper proposes a method combining the data extraction based on Coiflet wavelet analysis with the data processing based on multi-target optimization. This method can de- crease the affect by the ground capacitance effectively. With the simulation verification in Matlab platform, the result proves that the proposed method can effectively increase the accuracy in DC system grounding fault detection.

关 键 词：直流系统 接地故障 小波变换 多目标优化 coiflet 

分 类 号：TM721.1[电气工程—电力系统及自动化]