control of VSC-HVDC for wind power书

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1、ControlofVSC-HVDCforwindpowerChandraBajracharyaMasterofScienceinEnergyandEnvironmentSubmissiondate:June2008Supervisor:MartaMolinas,ELKRAFTNorwegianUniversityofScienceandTechnologyDepartmentofElectricalPowerEngineeringProblemDescriptionNorthofNorwayhasextremelygoodconditionsforwindpowergenerat

2、ion.Astheexistingmaingridwillnotbeabletointegrateallthewindparks,thealternativetobuildanewcorridorwithmulti-terminalHVDCLightfromNorthofNorwaytoMiddleofNorway,isunderstudy.HVDCLightismoreandmoreconcernedrecentlytoimprovepowersystemstabilityduetoitssupremecontrollability.Thethesiswillbedirecte

3、dtowardsinvestigatingthepossibleproblemstobeencounteredinanHVDCLightinstallation.AplatformforthecontrolofHVDCLightbasedonthevectorcontrolprinciplewillbefirstestablished.Withagoodunderstandingofthiscontrolplatform,themodelwillthenbetestedunderseveralcircuitconditions,totestthecapabilityandrobu

4、stnessofthecontrollertohandlethesesituations.Assignmentgiven:21.January2008Supervisor:MartaMolinas,ELKRAFTAbstractWiththerecentdevelopmentsinsemiconductorsandcontrolequipment,VoltageSourceConverterbasedHighVoltageDirectCurrent(VSC-HVDC)hasattractedthegrowinginterestofresearchers.TheuseofVSCte

5、chnologyandPulseWidthModulation(PWM)hasanumberofpotentialadvantages:shortcircuitcurrentreduction;rapidandindependentcontroloftheactiveandreactivepower,etc.Withsuchhighlyfavourableadvantages,VSC-HVDCisdefinitelygoingtobealargepartoffuturetransmissionanddistributionsystems.HVDCtechnologybasedon

6、VSCtechnologyhasbeenanareaofgrowinginterestrecentlybecauseofitssuitabilityinformingatransmissionlinkfortransmittingbulkamountofwindpower.ThisthesisdealswiththecontrolofVSC-HVDC.TheobjectiveoftheworkistounderstandthecontrolstructureoftheVSC-HVDCsystem,andestablishthetuningcriteriaforthePIcontr

7、ollersoftheconvertercontrollers.AmodelofaVSCbaseddclinkusingPWMTechnologyisdeveloped.AmathematicalmodelofthecontrolsystembasedontherelationshipsbetweenvoltageandcurrentisdescribedfortheVSC.Acontrolsystemisdevelopedcombininganinnercurrentloopc