基于变电站高频滤波边界特性的配电网线模行波选线方法
文档名：基于变电站高频滤波边界特性的配电网线模行波选线方法
摘要：受母线并联电容器对于线模行波的高频滤波作用的启发,该文跳出基于零模行波设计选线方法的视角,提出利用变电站边界特性的配电网线模行波选线方法.首先,研究证实了电子式电压互感器、金属氧化物避雷器与母线其余设备杂散电容共同组成的智能变电站线路边界具备强健的高频滤波特性,其对于线模行波的折射衰减作用为后续选线方法的设计奠定了基础;然后,基于健全线路与故障线路上线模行波高频瞬时能量的差异构造了选线新判据,其在高阻故障与小相角接地故障等工况下具备较高的灵敏度;最后,基于PSCAD/EMTDC仿真平台验证了所提选线方法的有效性、灵敏性与可靠性,该方法以线模行波作为所选模量,为故障选线问题的解决提供了全新的思路.
Abstract：Currently,thedistributionnetworksystemusuallyadoptsaneutralnon-effectivegroundingmethod.Howtoaccuratelyselectthefaultylinehasbeenaproblemforaverylongtime.Inrecentyears,withthewidespreadapplicationoflineselectiondevicesbasedonthetransient-basedmethod,thesuccessrateoffaultlineselectionhasimprovedsignificantly.However,whenhighresistancefaultsandsmallphaseanglegroundingfaultsoccur,theweakfaultcharacteristicsstilleasilycausethefailureofvariousexistinglineselectionmethods.Itshouldbenotedthattheaboveexistingtransient-basedlineselectionmethodsareallbasedonthezeromodetravelingwaves.Themainreasonforsuchconsiderationisthatwhenthesubstationbusbarisequippedwithparallelshuntcapacitors,thelinemodetravelingwavesonthenormallineisveryweakduetothehigh-frequencyfilteringeffectoftheshuntcapacitorswhilezeromodetravelingwavesarealmostunaffectedbecausetheycannotloopinanungroundedcapacitorbank.Althoughthelineselectionmethodsbasedonzeromodetravelingwaveshaveachievedgoodresultsinpracticalapplications,thefollowingproblemsstillexist:(1)Becausezeromodetravelingwaveattenuatesquickly,itmaybeverydifficulttoextractthezeromodetravelingwavesaccuratelywhenhighresistancefaultandsmallphaseanglegroundingfaultoccurattheendofalongfeeder.(2)Currently,onlytwo-phasecurrenttransformersareinstalledinmanydistributionnetworksystem,whichmakesitdifficulttoobtainzeromodetravelingwaves.Therefore,theabovedrawbackswillbecomeaconstrainttoimprovefurthertheperformanceofthecurrentlineselectionmethodsbasedonthezeromodetravelingwaves.Inspiredbythehigh-frequencyfilteringeffectofbusbarshuntcapacitorsonlinemodetravelingwaves,thispaperskippedtheperspectiveoffaultylineselectionmethoddesignbasedonzeromodetravelingwavesandproposesanewmethodusinglinemodetravelingwavesbasedonthesubstationboundarycharacteristicsinthedistributionnetwork.Firstly,theresearchesconfirmthatthesmartsubstationlineboundarycomposedoftheelectronicvoltagetransformers,themetal-oxidearresters,andtheremainingapparatus'sstraycapacitancehasstronghigh-frequencyfilteringcharacteristics,anditsrefractionattenuationeffectisalmostindependentofthebusbarsystemoperationmode,whichisofexcellentrobustnessandcanlayafoundationforthedesignoftheproposedlineselectionmethod.Then,basedontheTeagerenergyoperation,anewlineselectioncriterionisconstructedbasedonthedifferenceofthehigh-frequencyinstantaneousenergyofthelinemodetravelingwavesbetweenthenormallineandthefaultyline,whichhashighsensitivityundertheconditionsofhighresistancefaultsandsmallphaseanglegroundingfaults.Finally,theproposedmethodisbasedonthePSCAD/EMTDCplatformtoverifyitseffectiveness,sensitivity,andreliability.Itcanaccuratelyidentifythefaultlineandreliablydistinguishthebusbarfault.Otherwise,theproposedfaultlineselectionmethodhasfastoperationspeed,stronganti-noiseperformance,simplealgorithmprinciple,clearphysicalmeaning,nomanualthresholdsetting,andisunaffectedbyshuntcapacitors.Itcanrealizereliablelineselectionunderarcfaultsand3k?highresistancefaultsinthedistributionnetwork.Indeed,theproposedlineselectionmethodonlyappliestothesmartsubstationinstalledwiththeelectronicvoltagetransformers.Butluckily,thesmartsubstationhasbecomethemainconstructionformofthecurrentsubstation,whichprovidesapracticalbasisforthewideapplicationoftheproposednewlineselectionmethod.
作者：吴宇奇李正天林湘宁黄梓欣黎钊Author：WuYuqiLiZhengtianLinXiangningHuangZixinLiZhao
作者单位：华中科技大学(强电磁技术全国重点实验室)武汉430074
刊名：电工技术学报
Journal：TransactionsofChinaElectrotechnicalSociety
年，卷(期)：2024, 39(7)
分类号：TM773
关键词：配电网故障选线线模行波边界特性高频瞬时能量
Keywords：Distributionnetworkfaultylineselectionlinemodetravelingwaveboundarycharacteristichigh-frequencyinstantaneousenergy
机标分类号：TM711TM862TM451
在线出版日期：2024年4月12日
基金项目：国家重点研发计划，国家电网有限公司总部科技项目基于变电站高频滤波边界特性的配电网线模行波选线方法[
期刊论文]电工技术学报--2024, 39(7)吴宇奇李正天林湘宁黄梓欣黎钊受母线并联电容器对于线模行波的高频滤波作用的启发,该文跳出基于零模行波设计选线方法的视角,提出利用变电站边界特性的配电网线模行波选线方法.首先,研究证实了电子式电压互感器、金属氧化物避雷器与母线其余设备杂散...参考文献和引证文献
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