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1、-201711StudyonfaultcharacteristicandadaptabilityofACrelayprotectionandfaultlocationforAC-DCcrossshortfaultADissertationSubmittedfortheDegreeofEnginieerMasterCandidateDuWanlinSupervisorProf.WangGangSn.Ener.LiPingSouthChinaUniversityofTechnologyGuangzhou,C
2、hinaTM7710561201521012088/20171125201831615521064320wanlind3730@163.com()(510641)----500kV----PSCAD/EMTDC--PSCAD/EMTDC--51307065-IABSTRACTHVDC(HighVoltageDirectCurrent)systemhasahugeadvantageinlong-distance,large-capacitypowertransmission,andithasbeenwid
3、elyusedinChina.Duetothelimitationofthedesignandconstructionoftransmissioncorridor,short-circuitfaultscrossingamongtheAClinesandtheDClineswillinevitablyoccur.Besides,severeweatherinrecentyearsraisestheprobabilityofthefaults.Afterthefaulthappens,thereisdir
4、ectelectricalconnectionandinteractionbetweentheAClineandtheDCline,whichcausesthefaultcharacteristicsdistinguishfromthetraditionalAClinefault.ItwillalsohaveaneffectontherelayprotectionandfaultlocationmethodsofAClinesystems.Thispapermainlyconductsstudyonth
5、eAC-DCcrossshortfault.Firstly,basedonthe±500kVTian-GuangHVDCtransmissionproject,anAC-DCinterconnectionpowersystemwithAC-DCcrosslinesisconstructed.Thentheconductingstateofinverterisanalyzedwithdifferentsystemstatesandfailureconditions,andtheACshortcircuit
6、isobtained.Furthermore,takingDCsystemprotectionactionandunipolarlockoutintoaccount,furtherresearchonthefaultcharacteristicofAC-DCcrossshortiscarriedout.Afterwards,accordingtothefaultcharacteristicsanalysis,theadaptabilityofAClineprotectionprincipleontheA
7、C-DCcrossshort,includingdistanceprotection,longitudinaldifferentialprotectionandzero-sequencecurrentprotection,isinvestigated.SimulationusingPSCAD/EMTDCtoanalyzetheprotectionoperationcharacteristicisalsoconductedtoprovetheaccuracyoftheoreticalanalysis.Fi
8、nally,thispaperanalyzestheadaptabilityofthefaultlocationalgorithmofAClineontheAC-DCcrossshortfault.Afterthevastsimulationandverification,itshowsthatthefaultlocationalgorithmbasedonfrequency-domainmethodisunfitforAC-DCcross
