Thesis - Modeling and Analysis of a Flywheel Energy Storage

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1、ModelingandAnalysisofaFlywheelEnergyStorageSystemforVoltageSagCorrectionAThesisPresentedinPartialFulfillmentoftheRequirementsfortheDegreeofMasterofScienceWithaMajorinElectricalEngineeringintheCollegeofGraduateStudiesUniversityofIdahobySatishSamineniDecember200

2、3MajorProfessor:BrianK.Johnson,Ph.D.iiiABSTRACTAshipboardpowersystemisastiff,isolatedpowersystem.Powerisgeneratedlocally,anddistributedovershortdistancesmakingthesystemvulnerabletosystemtransients.Powerqualityproblemssuchasvoltagesags,whichariseduetoafaultorap

3、ulsedload,cancauseinterruptionsofcriticalloads.Thiscanbeofaseriousconcernforthesurvivabilityofacombatship.Aseriesvoltageinjectiontypeflywheelenergystoragesystemisusedtomitigatevoltagesags.Thebasiccircuitconsistsofanenergystoragesystem,powerelectronicinterfacea

4、ndaseriesconnectedtransformer.Inthiscasetheenergystoragesystemconsistsisaflywheelcoupledtoaninductionmachine.Thepowerelectronicinterfaceconsistsoftwovoltagesourcedconverters(VSC)connectedthroughacommonDClink.Theflywheelstoresenergyintheformofkineticenergyandth

5、einductionmachineisusedforenergyconversion.Bi-directionalpowerflowismaintainedbyregulatingtheDCbusvoltage.IndirectfieldorientatedcontrolwithspacevectorPWMisusedtocontroltheinductionmachine.SinusoidalPWMisusedforcontrollingthepowersystemsideVSC.Thispaperpresent

6、sthemodeling,simulationandanalysisofaflywheelenergystoragesystemandwithapowerconverterinterfaceusingEMTDC.ivACKNOWLEDGEMENTSIwouldliketothankmyadvisorDr.BrianK.Johnsonforgivingmetheopportunitytoworkonthisthesis.Iamgreatlyindebtedforhisencouragement,supportandg

7、uidancegivenduringthisproject.Itisanhonorandpleasuretohavehimasmyadvisor.IamgreatlythankfultoDr.HerbertL.Hessforhisfruitfuldiscussionsandvaluablesuggestionsthroughoutthisproject.Hisapproachofsolvingcomplicatedproblemswithsimplifiedanalysishelpedgreatlyinthisth

8、esis.IalsowishtothankDr.DeanB.Edwardsforhisinterestinthistopicandpatienceduringthepreparationofthisthesis.IamthankfultoDr.JosephD.Lawforsharinghistechnicalknowledgeandspendinghisva