基于模糊识别的励磁涌流二次谐波改进原理  

Improvement of 2nd Harmonic Inrush Current Discriminating Method Based on Fuzzy Recognition

作　　者：李艳艳[1] 刘建飞[1] 郑涛[1] 李海宇[1] 

机构地区：[1]华北电力大学电力系统保护与动态安全监控教育部重点实验室,北京市102206

出　　处：《电力系统自动化》2008年第13期62-66,共5页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50607006)~~

摘　　要：分析了变压器差动保护中传统方案二次谐波原理存在的缺陷,在此基础上,引入模糊识别法对其进行改进。充分挖掘判据的自适应性,不再使用单一划线式的"一刀切"门槛阈值,更好地匹配三相差流间的关系,相互制衡,在综合隶属度判据中采用反时限特征和延时门槛,使改进后的模糊识别二次谐波判据效果更加理想。此判据原理简单,科学合理,易于实现,在动作速度和防误动方面都有很大的进步。This paper analyzes the defects of the 2nd harmonic inrush current discriminating method that is traditionally used in transformer differential protection. A fuzzy recognition method is introduced to improve it. The improved 2nd harmonic fuzzy recognition criterion has better results by making use of the adaptive criterion, canceling a single line style of the ＂across the board＂ threshold. The proposed criterion can better match the relationships among three differential currents by using the inverse time and delay threshold features in the integrated membership degree calculation. This criterion is simple, scientific and reasonable in principle, and easy to implement. It has a great progress both in the operational speed and anti-- maloperation.

关 键 词：模糊识别 二次谐波原理 励磁涌流 反时限特征 延时门槛 

分 类 号：TM86[电气工程—高电压与绝缘技术] TM407