文档名：基于固态断路器主动注入式直流故障测距方法
摘要：随着直流配电网的快速发展与深化应用,准确可靠的故障测距技术对直流故障检修和恢复至关重要.该文提出一种基于固态断路器(SSCB)主动注入式直流故障测距方法.首先,利用SSCB开断主动注入不同脉冲宽度的信号,并检测注入脉冲首末端和反射波首末端的时间差作为注入波形传播时间间隔,能够减小采样频率带来的误差.然后,提取电缆线路电压线模量作为检测量,削弱正负极线路之间的耦合作用,获得稳定波速.最后,基于小波变换原理提出改进自适应模极大值方法来检测脉冲首末端时刻,减小噪声和过渡电阻对测距精度的影响.仿真结果表明,基于SSCB主动注入式测距方法在直流配电网单极接地和极间短路故障情况下均能够实现准确且快速的定位.
Abstract：AccurateandreliablefaultlocationtechnologyiscrucialforDCfaultrepairandrecoverywiththerapiddevelopmentandwidespreadapplicationofDCdistributionnetworks.Thepassivetravelingwaverangingmethodhastheissuesoflimitedenergyandinsufficienttravelingwavecharacteristicinformation.Thetraditionalactivetravelingwaverangingmethodpartiallyaddressestheseissues.However,theeffectsoflinewavespeedstabilityandsamplingfrequencyaresusceptible.ThispaperproposesanactiveinjectionDCfaultlocationmethodbasedonasolid-statecircuitbreaker(SSCB).First,theSSCBisutilizedtointerruptandactivelyinjectsignalswithdifferentpulsewidths.Thetimedifferencebetweenthefirstendoftheinjectedpulseandthefirstendofthereflectedwaveisdetectedasthetimeintervalofinjectionwaveformpropagation.Thisapproachreduceserrorscausedbysamplingfrequencylimitations.Then,thevoltagelinemodulusofthecablelineisextractedasthedetectionquantity,effectivelyweakeningthecouplingeffectbetweenthepositiveandnegativelinesandprovidingastablewavespeedmeasurement.Finally,basedonthewavelettransformprinciple,animprovedadaptivemodulusmaximumapproachisproposedtodetectthefirstandlastmomentsofthepulseaccurately.Thisapproachalsomitigatestheimpactofnoiseandtransitionresistanceonrangingaccuracy.Thesimulationresultsshowthattheproposedmethodachieveshighfaultlocationaccuracyforsingle-polegroundandbipolarshort-circuitfaultsinadistributionnetworkwithatotallinelengthof10km.Thefaultlocationaccuracyislessthan0.55%.Evenatahighsamplingfrequencyof80kHzin10kmDCdistributionlines,therelativeerroroffaultlocationremianswithin1.14%,whichreducesdependenceonsamplingfrequencyandenhancestherobustnessofthemethod.Moreover,themethodexhibitsresiliencetonoiseinterferenceatdifferentsignal-to-noiseratios.Withsignal-to-noiseratiosof40dB,20dB,and5dB,thefaultlocationaccuracywitharelativeerroroflessthan0.67%isconsistentlyachieved.However,whenthesignal-to-noiseratiodropsbelow5dB,theimpactofnoiseonrangingandpositioningincreases,posingchallengesforachievinghigh-precisionfaultlocation.Thefollowingconclusionscanbedrawnfromthesimulationanalysis.(1)Theproposedmethodachieveshigh-precisionfaultlocationundersingle-polegroundorinter-poleshort-circuitfaultsinDCdistributionnetworks.Itdoesnotrequireadditionalequipmentandissimpletooperate.(2)Adetectionmethodisintroducedtomeasuretheaveragetimedifferencebetweentheendofthetransmittedpulsewaveandtheendofthereflectedwaveofpulseswithdifferentwidths.Thismethodreducesthedependenceonsamplingaccuracycausedbythetravelingwaverangingmethod.(3)Animprovedadaptivemodulusmaximummethodisproposedbasedontheprincipleofwavelettransform.Themethodadaptivelysetsthethresholdvalueformodulusmaximumselectionbasedonfaultlineparameters,enhancingtheresistancetotransitionresistanceandnoiseinthedistancemeasurementmethod.(4)Theproposedsingle-endedrangingmethoddoesnotneedcommunication,whichissuitableforapplicationswithoutcommunicationfunctions.However,ithasthelimitationofadeadzoneinnear-endranges.Futureresearchwillfocusonaddressingthisissue.
作者：王伟 帅智康 李杨 何梨梨 方辰晨Author：WangWei ShuaiZhikang LiYang HeLili FangChenchen
作者单位：湖南大学电气与信息工程学院长沙410082
刊名：电工技术学报
Journal：TransactionsofChinaElectrotechnicalSociety
年，卷(期)：2024, 39(8)
分类号：TM614
关键词：直流配电网 故障测距 固态断路器 主动注入 自适应模极大值
Keywords：DCdistributionnetwork faultlocation solid-statecircuitbreaker activeinjection adaptivemodulusmaximum
机标分类号：TM721TM933TN958.98
在线出版日期：2024年4月29日
基金项目：国家自然科学基金，博士后面上资助项目，博士后面上资助项目，湖南省青年基金项目，湖南省重点研发计划项目，湖南省研究生科研创新项目基于固态断路器主动注入式直流故障测距方法[
期刊论文] 电工技术学报--2024, 39(8)王伟 帅智康 李杨 何梨梨 方辰晨随着直流配电网的快速发展与深化应用,准确可靠的故障测距技术对直流故障检修和恢复至关重要.该文提出一种基于固态断路器(SSCB)主动注入式直流故障测距方法.首先,利用SSCB开断主动注入不同脉冲宽度的信号,并检测注入脉...参考文献和引证文献
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