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,itisnecessaryt

2、osearchasustainabledevelopmentwayforpowerindustry．Microgridisanimportantpartofthefuturepowersystemforitsintelligentandsustainablecharacteristics．Microgridcanbeoperatedinbothgrid—connectedandautonomousmodes．Intheautonomousmode，thecontrolcouldachieveaccuratepowersharingbetweenDistribu

3、tedGenerators(DG)tokeeppowersupplyhighquality．Thedroopcontrolledmicrogridcouldreducethedependencyonthecommunication，increaseitsreliabilityandflexibility,andistheobjecttoresearchinthispaper．Theoperationcharacteristicsofislandedmicrogrid，andtheregulatingschemesofthevoltageandfrequency

4、arestudiedinthepaper．Themodifieddroopcontrolisproposed．Finally，thefunctionanddutytoimplementorcompleteforMicroGridEnergyManagementSystem(MG—EMS)isanalyzed．Thedetailedresearchisasfoilows(1)Thebasicconcept，componentofmicrogrid，andit'ssignificanceinChina，aresummarized．Thedomesticandove

5、rseassituationandhotissuesatpresentareanalyzed．ItisconcludedthatthedroopcontrolledmicrogridhasaIIl太原里三奎兰堕主塑壅竺兰篁堡壅——favourablepictureandtheresearchisusefulandtheoretical·(2)Theoutputimpedanceofinverterishighlyinductive-ThevoltageamplitudeVispositivelycorrelatedwithitsactiveoutput尸，wh

6、ilethephaseangle中ispositivelycorrelatedwithitsreactiveoutputQ，whicharebothprimary．Sothedecouplingcontrolisadopted，thedrooprelationshipsbetweenQ，VandP，∞introducedartificially,whichare--VandP一∞droopcontrol·Thepaperanalyzesintheorythevoltageandfrequencyregulationcharacteristicsofmicrog

7、ridbasedondroopcontrolledinverter．Theresultsarethatthemicrogridcanregulatethevoltageandfrequencyautomatically,andkeepingtheP-codroopgainsmallproperlycanimprovetheprimaryfrequencycontrolability·(3、)ThestructureofthedroopcontrolledDGinveter，andthefunctionofeverypartarebrieflyintroduce

8、d．Asystematicapproa