微电网中并网逆变器的研究

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1、AbstractWiththecontinuedincreaseoftheglobaleconomic，itwasfoundthattheshortageofenergyandtheconservationofenvironmenthadbecamethemainproblemoftheglobaleconomy．Althoughthereareavarietyoftheadvantagesofdistributedgeneration，itwillhavegreaterimpactonpowergridifdistributedgenerationsystemsaccess

2、tothepowergriddirectly．Tolowertheinfluenceofthedistributedgeneration，andimprovetheconsistencyofpowergrid．Microgridtechnologycomesintobeing．Forusers，microgridshowsacustomizablepower．Forpowersystem，microgridshowsasinglecontrolledunit．Microgridisanovelnetworkpresence，itcanrealizeswitchoverbetw

3、eengrid-connectedformandisolatedform．Therefore，theaccessstandardofmicrogridonlyaimsattheaccesspointofgrid—connectednetworkwithoutaimsatspecificdistributedgeneration．Itnotonlysolvestheaccessproblemoflarge—scaledistributedgeneration，butalsobetterdevelopsthepotentialofdistributedgeneration．Gri

4、d—connectedinverterisaveryimportantpartinmicrogrid，SOitisveryimportanttostudythegrid—connectedinverterofmicrogrid．Inthispaper,itresearchesthegrid—connectedinverterinmicrogriddetailly．UsingSVPWMtocontroltheoutputvoltage．ThewholeislanddetectionmoduleadoptstheOVP／OUPandOFP／UFPwithimprovedactiv

5、epowerperturbationmethodtOfinish．Toaccomplishtheseamlesstransitionswiththeimproveddroopcontr01．Researchworksinthispaperaresummarizedasfollows：1．Wepointoutthebasicconceptionandutilizationofmicrogrid．Andintroducethecategory,control，thetypeoftheoutputfilterandtopologicalstructureofthe鲥d·connec

6、tedinverter．2．Weresearchtheoutputvoltageofthegrid—connectedinvertertoincreasethesteadyanddynamiccharacter．ThePWMmodulationtechnologyiswidelyadoptedtorealizethecontrolofoutputvoltage．PWM，SPWM，SVPWMareproposedrespectively．Inthispaper,weuseSVPWMtechnologytomanagetheoutputvoltage．Torealizegridc

7、onnectionwithpowersystemhopefully．3．Weresearchtheislanddetectiontechnologyofthegrid-connectedsysteminmicrogrid．Microgridcannotonlygrid-connectedrun，butalsoisolatedrun．ItisimperativetOdetectthegrid—connectandisolate．Itdescribesthedefinitionoftheislanddete