欢迎来到天天文库
浏览记录
ID:57749864
大小:488.31 KB
页数:7页
时间:2020-03-28
《基于改进ITD边际谱熵的单相自适应重合闸.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第28卷第10期电力系统及其自动化学报Vo1.28No.102016年l0月ProceedingsoftheCSU—EPSA0ct.2016基于改进ITD边际谱熵的单相自适应重合闸周超,黄纯,江亚群,杜培伟,朱永强,康志豪(湖南大学电气与信息工程学院,长沙410082)摘要:基于固有时间尺度分解ITD算法,提出了改进ITD算法:针对波形失真问题,引人了有理样条函数插值和极值点延拓;针对虚假分量问题,增加了能量判据作为迭代终止条件。把改进ITD算法与边际谱熵相结合,用于判别高压输电线路单相接地故障类型。首
2、先ITD分解两种故障相电弧电压获得边际谱,然后分析对比了两种故障边际谱的特点,从时频域定性揭示了两种故障相电弧电压及其边际谱的差异,再根据信息熵原理,得出ITD边际谱熵来快速准确识别两种故障类型。结果表明:输电线路瞬时性故障时,熵值大于等于0.2;永久性故障时,熵值小于0.2。针对输电线路单相接地故障的仿真结果,验证了该方法有效、可行。关键词:单相自适应重合闸;固有时间尺度分解;边际谱熵;瞬时性故障;永久性故障中图分类号:TM727.2文献标志码:A文章编号:1003—8930(2016)10—0024
3、—07DOI:10.3969~.issn.1003—8930.2016.10.005Single—phaseAdaptiveReclosureBasedonMarginalSpectrumEntropyUsingImprovedITDZHOUChao,HUANGChun,JIANGYaqun,DUPeiwei,ZHUYongqiang,KANGZhihao(CollegeofElectricalandInformationEngineering,HunanUniversity,Changsha41008
4、2,China)Abstract:Animprovedintrinsictime—scaledecomposition(ITD)algorithmispresented:forwaveformdistortion,ratio—nalsplinefunctioninterpolationandextrapolationatextremepointsareintroduced;forfalseweight,theenergycriteri—onisaddedastheterminationcondition
5、foriteration.TheimprovedITDalgorithmandmarginalspectrumentropyarecombinedtodistinguishthesingle—phasegroundfaulttypesforhigh—voltagetransmissionline:first,ITDdecomposestwofaultswitharcvoltagetoobtainthemarginalspectrum,thenthecharacteristicsofmarginalspe
6、ctrumarecompared,andthedifferenceinthemarginalspectrumoffaultphasevohagesfromtime—frequencydomainisrevealed;accordingtotheinformationentropyprinciple,theITDmarginalspectrumentropycandistinguishbetweentwofaulttypesrapidlyandaccurately.Theresultsshowthatwh
7、enthetransmissionlineiswithtransientfault,theentropyvalueisgreaterthan0.2;andwithpermanentfault,theentropyvalueislessthan0.2.Thesimulationresultsoftransmissionlinewithsingle—phasegroundfaultdemonstratethattheproposedalgorithmiseffectiveandfeasible.Keywor
8、ds:single—phaseadaptivereelosure;intrinsictime—scaledecomposition(ITD);singularspectrumentropy;transientfauh;permanentfauh超高压输电线路是电力系统的重要部分,它肩电压的拍频特性,利用断开相恢复电压的瞬时最大负着传送功率和联络各个系统的重任,但不可避免值与最小值的比作为故障类型判据;文献[3]通过对地也会发生短路故障,实际
此文档下载收益归作者所有