基于信号复杂度衰减的特高压直流输电线路雷电暂态识别方法  

Transient identification method of lightning strokes based on the attenuation of signal complexity for UHVDC transmission lines

作　　者：齐国强 王增平 裘愉涛 应鸿 蓝益军 QI Guoqiang;WANG Zengping;QIU Yutao;YING Hong;LAN Yijun(State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;State Grid Zhejiang Electric Power Company Limited,Hangzhou 310007,China;Zhejiang Huayun Clean Energy Company Limited,Hangzhou 310008,China;Maintenance Company of State Grid Zhejiang Electric Power Company Limited,Hangzhou 310007,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206 [2]国网浙江省电力有限公司,浙江杭州310007 [3]浙江华云清洁能源有限公司,浙江杭州310008 [4]国网浙江省电力有限公司检修分公司,浙江杭州310007

出　　处：《电力系统保护与控制》2018年第17期1-8,共8页Power System Protection and Control

基　　金：国家重点研发计划项目资助(2016YFB0900604);国网浙江省电力有限公司科技项目(5211MR160006)~~

摘　　要：特高压直流输电线路雷击引起的暂态信号高频分量是行波保护和暂态保护误动的主要因素之一。发生线路雷击故障和普通接地短路故障时,电压信号的幅值因故障电流入地通路的存在快速衰减,信号复杂度低。雷击未故障时,不存在故障电流入地通路,信号衰减慢,复杂度高。基于小波变换分析电压信号频率分量的衰减,采用突变时刻前、后两个数据窗内小波奇异熵的比值表征信号复杂度的变化。再结合电压信号高频分量的含量分析,实现雷电暂态信号的识别,并通过能量相对熵实现故障极的选择。在PSCAD/EMTDC中搭建仿真模型,结果表明,该方案能很好地进行暂态信号的识别,受故障距离、过渡电阻等因素的影响小。The high-frequency component caused by lightning strokes on UHVDC transmission lines is the main factor of the mis-operation of travelling wave protection and transient protection.Due to the existence of fault current pathway to the earth,when lightning strokes failures and the common earth faults occur on the transmission lines,the voltage amplitude of the signal attenuates quickly,thus with a low signal complexity.While lightning strokes occur without forming faults,there is no fault current pathway to the earth,the signal attenuates slower,thus with a high signal complexity.Based on the wavelet transform analysis of the attenuation of voltage signal,this paper shows the ratio of data-windows before and after the mutation moment to describe the change of signal complexity.With the combination of high-frequency component content analysis of the voltage signal,the identification of lightning transient signal is achieved,and the faulted line is selected by the energy relative entropy.Based on the model built on PSCAD/EMTDC,the results show that the scheme identifies the transient signals effectively with less influence by the fault distance and the transition resistance,etc.

关 键 词：特高压直流输电 雷电干扰 信号复杂度 小波奇异熵 

分 类 号：TM721.1[电气工程—电力系统及自动化]