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1、哈尔滨工业大学工学硕士学位论文AbstractWiththeenvironmentalandenergyissuesbecomingincreasinglyprominent,thedistributedgenerationhasbeenpaidmoreandmoreattention.Microgridsolvedthisproblemfromuncontrollabledistributedconnectedtopowergrid.Studyingonmicrogridplatformforeducationhasv
2、italsignificanceforcultivatingthemicrogridtechnologyprofessionals.Thispaperdesignedamicrogridplatformforeducation.ThevoltagelevelofmicrogridACbuslinevoltageis36V,connectedbytheisolationtransformertothepowergrid.Thesubsystems,suchasstorageunit,generationtrainingte
3、stbench,photovoltaicsystem,windpowergenerationsystem,constitutethemicrogridplatform.Master-slavecontrolstructureisusedinthisplatform,energystorageasthemastersource,andtherestastheslavesources.Microgridplatformforeducationcanworkinthegridconnectedmodeandtheislandi
4、ngmode.PQcontrolisusedtocontrolallmicrosourcesinthegridconnectedmode.V/fcontrolisusedistocontrolthemastermicrosourec,whilePQcontrolisusedtocontroltheslavesourcesintheislandingmode.Microgridplatformforeducationoperationnormallyintheislandingmodeisanimportantsymbol
5、ofsuccesstobuildmicrogridplatform.Bidirectionalinverteristhemediabetweenenergystorgeunitandmicrogridplatform,andthestorageunitkeepsthefrequencyandvoltagestabilitywhenislandingoperation.Thispaperanalyzedthebidirectionalinverterworkingprincipleandspacevectormodulat
6、ionprincipleindetail.Theparametersofbidirectionalinverterswasgivenbasedonitsmathematicalmodel.Throughthecontrolofcurrentinverterside,canenergyflowbothwayswithunitpowerfactor.Bidirectionalinverterworksintheinvertermodewhenmicrogridplatforminislandingmode.Whenmicro
7、gridplatformingridconnectedoperation,bidirectionalinvertercanworkonrectifyorinverteraccordingtoneed,usedtochargeanddischargestorageunit.Bidirectionalinvertercanalsobeusedasordinaryofthegridconnectedinverterthroughchangesinprocedure.Thepowerlevelofbidirectionalinv
8、erterdesignedinthispaperis100W,andthegridcurrentwaveformdistortionrateislessthan5%nomatterwhenrectifierorinverter.Finally,thisthesisvalidatedtherationalityofth
