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dincreasing，itwillproduceessentia

2、lchangestothetraditionalradialdistributionnetworkandbringgreatthreattothesafeoperationofpowersystem．Smartgridtechnologyisasmallmicro-powersystemconsistingofdistributedpowersourceandtheload，whichnotonlyhastheadvantagesofdistributedgeneration，anditwillnotaffectthestructureoftheexist

3、ingdistributionnetwork，SOitcanbctterplaytheadvantagesofnewenergypowergeneration．Basedonthephotovoltaicinverterspowersupply，thispaperlauncharesearchofitapplicationinthemicro-gridenvironment．Firstly，thisarticlebdeflyintroducedthedevelopmentofphotovoltaicpowergenerationandmicro—gridt

4、echnology，secondlysummarizestheexistingcontrolstructureofthemicro-gridandgrid—connectioncontrol，alsoanalysestheshortcomingsofexistingmicropowergrid，throughtheanalysisofthedifferencesbetweenthemicrophotovoltaicinverterspowersupplyandsynchronousgeneratorofpowergrid，itisconcludedthat

5、thephotovolmicinverterspowersupplyhavefaultsofpoorflowability，smallcapacity，andsmallinertia．onthebasisoftheworkingprincipleofthesynchronousgenerator，therefore，thispaperputforwardaconceptofvirtualsynchronousgenerator，tobuildmicro-gridphotovoltaicinvertersbyimitatingthemathematicalm

6、odelandelectricalequationsofthesynchronousgenerator,SOthatmicro-gridphotovoltaicinvertersandsynchronousgeneratorshavethesimilarexternalcharacteristics．Accordingtothespecialrequirementstothemicro—gidPVinvertersundercircumstanceofmicro-gridrunintheparalleloperationandislandoperation

7、，basedontheworkingprincipleofspeedgovemorandexcitationcontrollerinpowergridthepaperdesignedmicro·gridPVpowerinverterspower-frequencycontrollerandexcitationcontroller，SOthatitcallachievefrequency，voltage，powerstability．Inordertoimprovethefrequencyunstablesituationcausedbyloadchangi

8、ng，astrategyofvariablevirtualiner