基于小波模极大值理论的励磁涌流新判据研究  

Research of inrush current identification based on wavelet and modulus maximum

作　　者：公茂法[1] 侯林源 司丹淼 周立人[1] 柳岩妮 Gong Maofa Hou Linyuan Si Danmiao Zhou Liren Liu Yanni(College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, Shandong , Chin)

机构地区：[1]山东科技大学电气与自动化工程学院,山东青岛266590

出　　处：《电测与仪表》2016年第17期29-33,111,共6页Electrical Measurement & Instrumentation

基　　金：山东省自然科学基金(ZR2012EEM021)

摘　　要：针对励磁涌流引起变压器纵联差动保护误动的问题,提出了一种基于小波变换和模极大值理论来辨别励磁涌流与故障电流的新依据。该方法根据励磁涌流含有大量非周期分量和波形间断角,而故障电流保持基频正弦波的特点。首先利用小波分解原始信号,再利用模极大值理论选取模极大值点,通过模极大值点之间的数值关系可以鉴别不同电流信号。经过Matlab/Simulink仿真分析,表明该方法能够准确可靠地区分励磁涌流和故障电流。Aiming at the problem that inrush current can lead to the mal-operation in differential transformer protec- tion, and this paper came up with a new method to identify inrush current and fault current based on wavelet transform and modulus maximum. Because the inrush current contains a large component of non-periodic components and dead angle, while fault current always keeps its fundamental frequency, the new method is just based on these eharaeteris- tics. Firstly, it uses wavelet to decompose original signals , and then, select maximal points based on the theory of modulus maximum, by using the numerical relations between maximal points can distinguish different current signals. By adopting Matlab/Simulink, the simulation results show that this method can distinguish inrush current and fault current reliably.

关 键 词：变压器 励磁涌流 小波变换 模极大值 

分 类 号：TM86[电气工程—高电压与绝缘技术]