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，withthelargescaledevelopmentofgridconnec．te

2、dPVsystem，itsvolatility,intermittent，andrandomnesswouldbringmanydisadvantagestogrid．However,takinguseofmicrogridtocon、nectthePVgenerationwithgridandmakingactivepowercoordinatecontrolbetweenvariousmicrosourcesbyautomaticcontrolabilityofmicrogridcouldeffectivelysolvet

3、hefrequencyfluctuationsproblemcausedbyphotovoltaicgeneration．Itpromoteembedresearchonfrequencyadjustmenttechnologyofphotovoltaicmicrogridinthearticle，itsmainjobcanbedescribedasfollows：．(I)Itmakesanalysisandconclusionforthecontr01strategyofmicrosourcesandmicrogrid．On

4、thebasicoffundamentalstructureofmicrogridandmicrosourcesconnectedtogridbyinverter,itmakeresearchonthecommonprincipleofthecontrolstrategy,structureofcontroller,andapplicationconditionofmicrosources；Fromthetopmanagementofmicrogrid，itconcludesandcontrastsdifferentimple

5、mentmethod，relativemerits，andapplicationrangeofvariouscontrolmodelofmicrogrid，anditpointoutcorrespondingcont，rolmodelwithdifferentdemandformicrogrid．(2)Itlucubratesthemathematicmodelandoutputcharacteristicsofphotovoltaic，battery,anddieselgeneration．Consideringtheapp

6、licationconditionofcontrolstrategyforvariousinverters，itmakesuseofDIgSILENT／PowerFactorytoconstructasystemmodelofphotovoltaicmicrogrid，includingaforesaidthreedifferentmicrosources．(3)Accordingtodifferentcharacteristicsandfrequencycharacteristic，itdesignthefrequencyc

7、ontrollerofvariousmicrosources．Inaddition，itproposesafrequencycontrolstrategyofphotovoltaicmicrogridbasedonhierarchicalcontr01．Whenthefluctuationoccursonthefrequencyofmicrogrid，firstly,itenergystoragetosharetheoutputpowerofdieselgeneratorSOthatitcouldrestraintheinit

8、ialdisturbanceoffrequency．Aftertheinitialdisturbance，taskofprimaryfrequencycontrolandsecondfrequencyregulationcouldbeachievedwiththedroopc