Introduction_to_HVDC_VSC_ALSTOM

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1、IntroductiontoHVDCVSCHVDCDrRadnyaAMukhedkarGroupLeader,SeniorPrincipalEngineerSystemDesignAugust2010GRIDTheVoltageSourcedConverterSinglePhaseAlternatingVoltageOutputSteadyDC+VoltageVSCInputP2TheVoltageSourcedConverterThreePhaseAlternatingVoltageOutputSteadyDC+VoltageVSCInputP3AC/

2、DCSystemSchematicIdealLoadFlowXTXXLIMB/2IACLine-to-GroundLine-to-GroundLine-to-GroundDCTransformerACSystemVoltageValveVoltageVoltageSecondaryVoltageV1V2V3ImV3sin()IPV1XV3VReV3cos()V1QV1V1XP4VSCSynthesisofaSineWaveVoltageWaveformsSimplestPossibleWaveformIdealWaveformAcceptableAppr

3、oximationifSufficientStepsareUsedT0557.3cP5TheVoltageSourcedConverterSinglePhase,2-levelAlternatingVoltageOutputSteadyDC+VoltageVSCInputNeutralP6VSC:ThreeMainClassesReductioninHarmonicDistortion+IncreasedRatingSimpleTransformerComplexTransformer++Complex,SimpleConverters“Multi-le

4、vel”ConvertersSimpleTransformer+SimpleConverterswithPWMP7ComplexTransformer+simpleconvertersOutputVoltageSimpleVSCResultantOutputVoltageOutputVoltageSimpleVSCOutputVoltageSimpleVSCOutputVoltageSimpleVSCT0811.1P8SimpleTransformer,SimpleConverter+PWMOutputVoltageSimpleVSCOutputVolt

5、age,filteredP9Multi-LevelConverterOutputVoltageMulti-levelVSCP10Whatisamulti-levelconverter?VoltsVoltsVoltsVoltsTimeTimeTotalFlexibilityP11VSCConverter:phasearmLine-Neutralvoltage(ideal)VSCPhase½UUnit+½UdcDCdcTransmissionACUSystemTerminal½Udc-½UdcP12SemiconductorsforVSCVoltage-So

6、urcedConvertersrequiresemiconductorswhichcancarrycurrentinbothdirectionsandwithstandvoltageinthepositivedirectionThefollowingtypesofdevicehavetheappropriateproperties:Thyristorderivatives:−GTO:GateTurn-Offthyristor−GCT:GateCommutatedThyristor(=aGTOwithabettergatedrive)−IGCT:Integ

7、ratedGateCommutatedThyristor(=aGCTwiththegatedriveintegratedintothesemiconductorpackage)Transistorderivatives:−BJT:BipolarJunctionTransistor(onlyforlowpowerandlowfrequency)−MOSFET:Metal-OxideSemiconductorFieldEffectTransistor(onlyforlowpower)−IGBT:InsulatedGateBipolarTransistor−I

8、EGT:InjectionEnhancedGateTransistorsimil