光伏微网建模及其分层协调控制研究

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1、摘要AbstractAlongwiththehighlightofworldwideenergycrisisandenvironmentaldegradationproblem，photovoltaicpowergenerationwithitscleanandenvironmentalcharacteristicsmustbeonemostimportantalternativeenergyforpowersystem．Meanwhile，withthelargescaledevelopmentofgridc

2、onnec．tedPVsystem，itsvolatility,intermittent，andrandomnesswouldbringmanydisadvantagestogrid．However,takinguseofmicrogridtocon、nectthePVgenerationwithgridandmakingactivepowercoordinatecontrolbetweenvariousmicrosourcesbyautomaticcontrolabilityofmicrogridcoulde

3、ffectivelysolvethefrequencyfluctuationsproblemcausedbyphotovoltaicgeneration．Itpromoteembedresearchonfrequencyadjustmenttechnologyofphotovoltaicmicrogridinthearticle，itsmainjobcanbedescribedasfollows：．(I)Itmakesanalysisandconclusionforthecontr01strategyofmic

4、rosourcesandmicrogrid．Onthebasicoffundamentalstructureofmicrogridandmicrosourcesconnectedtogridbyinverter,itmakeresearchonthecommonprincipleofthecontrolstrategy,structureofcontroller,andapplicationconditionofmicrosources；Fromthetopmanagementofmicrogrid，itcon

5、cludesandcontrastsdifferentimplementmethod，relativemerits，andapplicationrangeofvariouscontrolmodelofmicrogrid，anditpointoutcorrespondingcont，rolmodelwithdifferentdemandformicrogrid．(2)Itlucubratesthemathematicmodelandoutputcharacteristicsofphotovoltaic，batte

6、ry,anddieselgeneration．Consideringtheapplicationconditionofcontrolstrategyforvariousinverters，itmakesuseofDIgSILENT／PowerFactorytoconstructasystemmodelofphotovoltaicmicrogrid，includingaforesaidthreedifferentmicrosources．(3)Accordingtodifferentcharacteristics

7、andfrequencycharacteristic，itdesignthefrequencycontrollerofvariousmicrosources．Inaddition，itproposesafrequencycontrolstrategyofphotovoltaicmicrogridbasedonhierarchicalcontr01．Whenthefluctuationoccursonthefrequencyofmicrogrid，firstly,itenergystoragetosharethe

8、outputpowerofdieselgeneratorSOthatitcouldrestraintheinitialdisturbanceoffrequency．Aftertheinitialdisturbance，taskofprimaryfrequencycontrolandsecondfrequencyregulationcouldbeachievedwiththedroopc