光伏微网逆变电源控制策略及应用的研究

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1、万方数据II万方数据AbstractPhotovoltaicpowergenerationasthemostpromisingnewenergypowergeneration，hasbeenstrongsupportedandpromotioninrecentyears．Photovoltaicenergyisgenerallyprovidedtotheuserthroughthegrd．However，asthenumberofthedistributedpoweraccessingto鲥dincreasin

2、g，itwillproduceessentialchangestothetraditionalradialdistributionnetworkandbringgreatthreattothesafeoperationofpowersystem．Smartgridtechnologyisasmallmicro-powersystemconsistingofdistributedpowersourceandtheload，whichnotonlyhastheadvantagesofdistributedgener

3、ation，anditwillnotaffectthestructureoftheexistingdistributionnetwork，SOitcanbctterplaytheadvantagesofnewenergypowergeneration．Basedonthephotovoltaicinverterspowersupply，thispaperlauncharesearchofitapplicationinthemicro-gridenvironment．Firstly，thisarticlebdef

4、lyintroducedthedevelopmentofphotovoltaicpowergenerationandmicro—gridtechnology，secondlysummarizestheexistingcontrolstructureofthemicro-gridandgrid—connectioncontrol，alsoanalysestheshortcomingsofexistingmicropowergrid，throughtheanalysisofthedifferencesbetween

5、themicrophotovoltaicinverterspowersupplyandsynchronousgeneratorofpowergrid，itisconcludedthatthephotovolmicinverterspowersupplyhavefaultsofpoorflowability，smallcapacity，andsmallinertia．onthebasisoftheworkingprincipleofthesynchronousgenerator，therefore，thispap

6、erputforwardaconceptofvirtualsynchronousgenerator，tobuildmicro-gridphotovoltaicinvertersbyimitatingthemathematicalmodelandelectricalequationsofthesynchronousgenerator,SOthatmicro-gridphotovoltaicinvertersandsynchronousgeneratorshavethesimilarexternalcharacte

7、ristics．Accordingtothespecialrequirementstothemicro—gidPVinvertersundercircumstanceofmicro-gridrunintheparalleloperationandislandoperation，basedontheworkingprincipleofspeedgovemorandexcitationcontrollerinpowergridthepaperdesignedmicro·gridPVpowerinverterspow

8、er-frequencycontrollerandexcitationcontroller，SOthatitcallachievefrequency，voltage，powerstability．Inordertoimprovethefrequencyunstablesituationcausedbyloadchanging，astrategyofvariablevirtualiner