特高压母线差动保护研究

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1、东南大学博士学位论文特高压母线差动保护研究姓名：吴崇昊申请学位级别：博士专业：电力系统及其自动化指导教师：陆于平20080315东南大学博士学位论文AbstractWiththeincreasingpowergridscapacityandtheextendinginter-connectionscale，therequirementoflongdistanceandlargecapacitytransmissionpromotesthedevelopmentofultra-highvoltagetransmissiontech

2、nology．BnsbaristhecenterofelectricalpowerexchangeandanimportantcomponentofUHVpower鲥d．Ifshort—circuitfaultonbusbarisn’tclearedintime，thestabilityandsafetyofUHVpowersystemwillbeendangered．Aimedatthecharacteristicsofultra-highvoltagebusbarfaultanditseffectonbusbardiffer

3、entialprotection，thenewissuesabouttheprincipleofultra-highvoltagebusbardifferentialprotectionareresearchedinthethesis．Theresearchcontentisgivenasfollowing：(1)Theultra-highvoltagebusbarfaultelectromagnetictransientcharacteristicsisresearched．Afrequency—domainmethodfor

4、complexelectricalnetworkcomputingispresented．Usingthemethod，thecharacteristicparametersoffaultcurrenttransientcomponentisworkedoutanditsruleissummarized．Thetime—domainsimulatingmodelandauto-batchsimulatingtoolkitof1000kVultra-highvoltageexperimentaldemonstrationproje

5、ctisestablished．Theultra-highvoltagebusbardifferentialprotectionoperatingcharacteristicsisanalyzedwithdifferentfaultandsystemparameters．Bythecharacteristicsoffaultcurrenttransientcomponents，itsmechanismandeffectonbusbardifferentialprotectionoperatingisanalyzed．(2)The

6、differentialprotectionoperatingdelayproblemcausedbyfaultcurrenthigh-frequencytransientcomponentatinternalbusbarfaultisresearched．Tosolvetheproblem，harmonicphasordifferentialprotectionprincipleispresentedascountermeasure．(3)Aimedatthecharacteristicofhighdecaytimeconst

7、antofnonperiodiccomponentsinultra-hi曲voltagebusbarfaultCUlTent，theCTanti-saturationcriterionofbusbardifferentialprotectionandbusbarprotectionoperatingcriterionunderCTsaturationisresearched．BasedontheperiodicityofCTlineartransfersection．ananti—saturationcriterionandsu

8、pportingbusbardifferentialprotectionispresented．UtilizingtheperiodicityofCTtransfer,sampledvaluedifferentialprotectioncanbesafelyap