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ID:34592350
大小:14.19 MB
页数:61页
时间:2019-03-08
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1、ABSTRACTAstheproblemoftheenvironmentismoreandmoreserious,thedistributedpowergenerationtechnologyhasbeenpaidwidelyattentionandlotsofresearchesareconducted.ButlargepenetrationofDGswillcertainlyreducethestabilityoftheutilitywhenaccessingtothenetworkandotherbadinfluenceswillalsobebroughtout.Inorder
2、tocoordinatethecontradictionsbetweenDGsandutilityandfullyexcavatevalueandbenefitsbroughtbyDGstousersandgrid,theresearchersproposetheconceptofMicrogrid.Microgridgetsthedistributedgenerators,loads,distributedenergystorages,andcontroldevicestogether,itcanoperatewithutilityactingasacontrollableunit
3、andapartfromutilityoperatingwithitselfwhenfaultoccurswithinthenetworkaswell.Microgridisregardedasthemosteffectivewaytousedistributedenergy.Aimingatthetypicalmicrogfid,abasicresearchisconductedtosupportthetheoreticalgistforthedemonstrationprojects,correspondingresearchworkasfollowing:1)ThePVgene
4、ratorsystemandenergystoragesystemareanalyzedparticularly,andthepracticalmathematicalmodelsofPVmodularandbatterycellarebuilt.Then,thedynamicalexternalcharacteristicsarestudied,andcomparedwiththeparagraphsupportedbymanufacturer.2)TheDCconvertorandACconvertor’Sstructureandcontroltechareintroducedp
5、articularly,andtheconstantpowercontrol,constantvoltage/frequencycontrol,droopcontrolareanalyzed,andcontrolstrategiesarebuiltcorrespondingly.MoreemphasesarepaidonPVcontrolofPVsystemandPQ&U/Fcontrolofenergystoragesystem,andtheyaremodeledandsimulatedlayingthefoundationforthewholemicrogridsimulatio
6、n.3)Themicrogrid’Soperationmodesandcoordinationcontrolmethodsaresummarized,andtheadvantagesanddisadvantagesofC-Smode,P2Pmode,hierarchicalmodeandtheproblemsneedtobesolvedatdifferentoperationmodeareanalyzed.Asaresult,apracticalmicrogridmodelbasedonC-SmodeisdevelopedincludingPVgeneratorandbatterys
7、ystem.4)ThemicrogridincludingPVandbatteryaremodeledbasedonPSCAD,whichisanelectromagnetictransientsoftwareusedinpowersystemsimulation.ThePQandU/fcontrolstrategyofDGarestudiedandsomeoperationconditionsaredesignedsuchasgrid—connected
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