基于逆变器下垂控制的微电网运行特性及其控制系统-研究

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1、———————————————二堕要燮兰堡主堕窒竺兰垡笙塞RESEARCHONOPERATIONCHARACTERISTICSANDCONTROLSYSTEMOFMICROGRIDBASEDONDROOPCONTROLOFINVERTERSABSTRACTEnergysourcesarepowerforceofsocietyandeconomytodevelop．WhentheproblemsofenVironmentandthegradualexhaustionofconventionalenergystandoutdeeply,itisnecessarytosearchasust

2、ainabledevelopmentwayforpowerindustry．Microgridisanimportantpartofthefuturepowersystemforitsintelligentandsustainablecharacteristics．Microgridcanbeoperatedinbothgrid—connectedandautonomousmodes．Intheautonomousmode，thecontrolcouldachieveaccuratepowersharingbetweenDistributedGenerators(DG)tokeepp

3、owersupplyhighquality．Thedroopcontrolledmicrogridcouldreducethedependencyonthecommunication，increaseitsreliabilityandflexibility,andistheobjecttoresearchinthispaper．Theoperationcharacteristicsofislandedmicrogrid，andtheregulatingschemesofthevoltageandfrequencyarestudiedinthepaper．Themodifieddroo

4、pcontrolisproposed．Finally，thefunctionanddutytoimplementorcompleteforMicroGridEnergyManagementSystem(MG—EMS)isanalyzed．Thedetailedresearchisasfoilows(1)Thebasicconcept，componentofmicrogrid，andit'ssignificanceinChina，aresummarized．Thedomesticandoverseassituationandhotissuesatpresentareanalyzed．I

5、tisconcludedthatthedroopcontrolledmicrogridhasaIIl太原里三奎兰堕主塑壅竺兰篁堡壅——favourablepictureandtheresearchisusefulandtheoretical·(2)Theoutputimpedanceofinverterishighlyinductive-ThevoltageamplitudeVispositivelycorrelatedwithitsactiveoutput尸，whilethephaseangle中ispositivelycorrelatedwithitsreactiveoutput

6、Q，whicharebothprimary．Sothedecouplingcontrolisadopted，thedrooprelationshipsbetweenQ，VandP，∞introducedartificially,whichare--VandP一∞droopcontrol·Thepaperanalyzesintheorythevoltageandfrequencyregulationcharacteristicsofmicrogridbasedondroopcontrolledinverter．Theresultsarethatthemicrogridcanregula

7、tethevoltageandfrequencyautomatically,andkeepingtheP-codroopgainsmallproperlycanimprovetheprimaryfrequencycontrolability·(3、)ThestructureofthedroopcontrolledDGinveter，andthefunctionofeverypartarebrieflyintroduced．Asystematicapproa