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1、東南大學(xué)博士學(xué)位論文特高壓母線差動(dòng)保護(hù)研究姓名：吳崇昊申請(qǐng)學(xué)位級(jí)別：博士專業(yè)：電力系統(tǒng)及其自動(dòng)化指導(dǎo)教師：陸于平20080315東南大學(xué)博士學(xué)位論文AbstractWiththeincreasingpowergridscapacityandtheextendinginterconnectionscale，therequirementoflongdistanceandlargecapacitytransmissionpromotesthe

2、developmentofultrahighvoltagetransmissiontechnologyBnsbaristhecenterofelectricalpowerexchangeandanimportantcomponentofUHVpower鰣dIfshort—circuitfaultonbusbarisn’tclearedintime，thestabilityandsafetyofUHVpowersystemwillbeen

3、dangeredAimedatthecharacteristicsofultrahighvoltagebusbarfaultanditseffectonbusbardifferentialprotection，thenewissuesabouttheprincipleofultrahighvoltagebusbardifferentialprotectionareresearchedinthethesisTheresearchconte

4、ntisgivenasfollowing：(1)TheultrahighvoltagebusbarfaultelectromagnetictransientcharacteristicsisresearchedAfrequency—domainmethodforcomplexelectricalnetworkcomputingispresentedUsingthemethod，thecharacteristicparametersoff

5、aultcurrenttransientcomponentisworkedoutanditsruleissummarizedThetime—domainsimulatingmodelandautobatchsimulatingtoolkitof1000kVultrahighvoltageexperimentaldemonstrationprojectisestablishedTheultrahighvoltagebusbardiffer

6、entialprotectionoperatingcharacteristicsisanalyzedwithdifferentfaultandsystemparametersBythecharacteristicsoffaultcurrenttransientcomponents，itsmechanismandeffectonbusbardifferentialprotectionoperatingisanalyzed(2)Thedif

7、ferentialprotectionoperatingdelayproblemcausedbyfaultcurrenthighfrequencytransientcomponentatinternalbusbarfaultisresearchedTosolvetheproblem，harmonicphasordifferentialprotectionprincipleispresentedascountermeasure(3)Aim

8、edatthecharacteristicofhighdecaytimeconstantofnonperiodiccomponentsinultrahi曲voltagebusbarfaultCUlTent，theCTantisaturationcriterionofbusbardifferentialprotectionandbusbarprotectionoperatingcriterionunderCTsaturationisres

9、earchedBasedontheperiodicityofCTlineartransfersectionananti—saturationcriterionandsupportingbusbardifferentialprotectionispresentedUtilizingtheperiodicityofCTtransfersampledvaluedifferentialprotectioncanbesafelyappliedin

10、lineartransfersectiontoimprovebusbardifferentialprotectionoperatingrateandsensitivityattransitionalfaultwiththepremiseofguaranteedblockingreliabilityunderCTsaturationatextemalfault(4)TheflowoutcurrentratioofUHVtwobreaker

11、swiringatinternalbusbarfaultintheconditionofmultibreakerseriesisstudiedThevariationcharacteristicsofflowoutcurrentatinternalfaultanditseffectonbusbardifferentialprotectionisanalyzedThedifficultyinimprovingtheabilityofant

12、iflowoutcurrentatinternalfaultandrestraintcredibilityatexternalfaultforratiestraintcharacteristicsofbusbardifferentialprotectionisresearchedThenathreesegmentspolygonallineratiestrainedcharacteristicsthatcalculatesrestrai

13、nedcurrentbybranchispresentedThenewrestraintmethodCanimproveantiflowoutcurrentcapabilityatinternalfaultandavoidrestraintabilitydegradingatexternalfault(5)AimedathiglltransformationratioandlightloadofultrahighvoltageCTCTt

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