复杂电网继电保护整定方法分析与其工程应用

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1、华中科技大学硕士学位论文AbstractRelayprotectionisthefirstdefenselinetoensurethesafeandstablerunningofthepowersystem.Relayprotectioncanisolatethefaultelementsselectivelyandquicklytoensurethesafetyoperationofelectricalequipmentandthestableworkingofpowersystemeffective

2、ly.Onthecontrary,themal-operationorfail-to-tripofrelayprotectionmayresultinexpansionoffailuresorevenleadtolargescaleblackout,whichbringssignificanteconomiclosses.Reasonablesettingofrelayprotectionistheimportantfundamentofplayingrelayprotection’sparteffec

3、tively.Withthedevelopmentofpowersystems,thegridstructureisbecomingmoreandmorecomplex.Especially,thewideapplicationofnewtransmissiontypes,representedbyparalleltransmissionlinesonsametower,hasbroughtalotofnewproblemstoprotectionsetting.Incombinationwiththe

4、foreignpracticalprojectofahydropowerstation,thisthesiscarriesoutasystematicstudyontheparametercalculationmethodandshortcircuitfaultsimulationmodelingoftheparalleltransmissionlinesonsametower,andthesettingcalculationmethodanditsengineeringproblemsofthepro

5、tectionoftheparalleltransmissionlinesonsametower,complextransformer-linecompositionunitaswellashighimpedancebusbardifferentialprotection,etc.Thestudyissignificanttoensuringthesafeoperationofthispowergridaswellaspromotingtheinternationalcooperationandcomm

6、unicationinthepowerelectricaldomain.Oneofthekeyissuesofrelayprotectionsettingcalculationmethodistheparametercalculationmethodandshortcircuitfaultsimulationmodelingoftheparalleltransmissionlinesonsametower.Basedontheanalysisofbasicparametercalculationmeth

7、odoftransmissionlines,auniversalcalculationmethodofsequenceimpedanceparametersisadoptedinthisthesis.Themethodcanbeusedforbothsingletransmissionlineandparalleltransmissionlinesonsametower,andcanimprovethecalculationaccuracyonconditionthattheconductoriswit

8、houttranspositionorthetowerstructureisinconsistent.Thisthesisintroducesthebasicprincipleandapplicationexamplesindetail.Inaddition,forthereasonthattheexistingPSASPsoftwarecannotdirectlyprovidethesimulationmodelofparalleltra