基于信号复杂度的高压交流线路暂态保护研究  

Signal Complexity-based Research on Transient Protection of High Voltage AC Line

作　　者：王家慧 王增平[1] 王松 吴佳毅 戚宣威 WANG Jiahui;WANG Zengping;WANG Song;WU Jiayi;QI Xuanwei(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;State Grid Zhejiang Electric Power Research Institute,Hangzhou 310007,China;State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310007,China)

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206 [2]国网浙江省电力有限公司电力科学研究院,浙江杭州310007 [3]国网浙江省电力有限公司,浙江杭州310007

出　　处：《华北电力大学学报（自然科学版）》2019年第1期1-8,16,共9页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家电网公司科技项目(521104170012);国家重点研发计划项目(2016YFB0900604)

摘　　要：基于线路故障暂态特征的保护比传统保护响应更快,对故障的判断更加准确,而且不会受到工频振荡等情况的影响。分析了线路故障时产生暂态分量的原因以及发生区内外故障时暂态特征存在差异的原因,介绍了小波变换以及小波奇异熵,用小波奇异熵来表征信号复杂度的变化,基于小波变换分析电流信号,并用小波奇异熵进一步分析信号的复杂度。在MATLAB/Simulink中搭建500kV线路仿真模型,通过仿真发现,线路发生区内故障时信号复杂度明显高于发生区外故障时的信号复杂度,利用区内、外故障时信号复杂度的差异构成了区分区内外故障的判据。The protection based on the transient characteristics of the line fault is faster than the traditional protection and has more accurate judgment of the fault,which will not be affected by the frequency oscillation and other factors.Firstly,this paper analyzed the reasons for the transient component of the line fault and for the differences between the transient characteristics of internal and external fault.Then,the paper introduced wavelet transform and wavelet singular entropy.The wavelet singular entropy was adopted to represent the change of signal complexity.The current signals and signal complexity were analyzed by applying wavelet transform and wavelet singular entropy respectively.A 500 kV line simulation model was established in MATLAB/Simulink.It was found that the signal complexity of internal fault was significantly higher than that of external fault.The differences between signal complexity of internal and external faults can be regarded as the criteria for distinguishing the two different faults.

关 键 词：线路保护 暂态量保护 信号复杂度 小波奇异熵 小波变换 

分 类 号：TM564[电气工程—电器]