HVDC_BASIC_THEORY

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1、IntroductiontoHVDCBasicsofHVDCWhyHVDC?HVDCTheoryBasicsofHVDCPrinciplesofHVDCHVDCApplicationsHVDCLongDistanceTransmissionSystemsWhyBack-to-BackLinksHVDCStationPrinciplesofHVDCSimplifiedBlockDiagramCharacteristicsACDCACIdinonedirectiononlySystemSystem1System2MagnitudeofPorIdcontrolleddepe

2、ndingondifferenceinterminalEquivalentCircuitvoltages(U1,U2)IRUdPUDirectionofPcontrolled12dependingonpolarityofterminalvoltages(U1,U2)HVDCApplicationsLongDistanceACACSystem1DClineSystem2SeaCableACACSystem1DCcableSystem2Back-to-BackACACSystem1System2HVDCLongDistanceTransmissionSystemsMono

3、polarTransmissionTerminalLineTerminalBABipolarPole1Pole2TransmissionTerminalTerminalBLineAHVDCLongDistanceTransmissionSystemsBipolarSystem:OperatingModesBipolarMonopolar,groundreturnoneDClinepoleHVDCLongDistanceTransmissionSystemsMultiTerminalTerminalsinParallelTerminalsinSeriesBack-to-

4、BackLinksACACSystem1System2TechnicalReasonsDifferentsystemfrequencies(f1„f2)Differentsystemcontrol(Df1„Df2)ExchangeoflowpowercomparedtothesizeoftheinterconnectedACsystemsHVDCStationBipolarHVDCTerminalACACSystem1System21ACSwitchyardTo/fromControls,Protection,Monitoringotherterminal2ACFil

5、ters,CapacitorBanksDC3ConverterTransformersfilterPole14ThyristorValvesACfilterDCPole2filter5SmoothingReactorsandDCFilters1234566DCSwitchyardHVDCStationTasksofEquipmentACSwitchyard(1)ConnecttheterminaltotheACsystemACFilters,CapacitorBanks(2)ReactivepowersupplyFilterharmoniccurrentsConver

6、terTransformer(3)ObtaintheACvoltageneededfortherequiredDCvoltageObtain12-pulseoperation(staranddeltaconnection)Allowforseriesconnectionof6-pulsebridgesHVDCStationTasksofEquipmentThyristorValves(4)ConvertACtoDCandvice-versaConnect6-pulsebridgesinseriesforrequiredDCvoltageSmoothingReactor

7、sandDCFilters(5)SmoothentheDCcurrentAvoidresonancewithDClineLimitinterferencecausedbyDCsideharmonicsDCSwitchyard(6)AchieverequiredDC-sidetransmissionconfigurationConverterTheory-CommutationGroupsConverterTheory-CommutationGroupsThree-PulseConverter(CommutationReactancesneglecte