小功率光伏并网系统的研究和设计

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1、Subject:TheResearchandDesignofLow-powerPhotovoltaicGrid-connectedSystemSpeciality:PowerElectronicsandPowerDrivesName:ChengXiangpu(Signature)Instructor:CaiWenhao(Signature)ABSTRACTWiththedevelopmentofsociety,energyshortagesandthedeteriorationofecologicalenvironmenthavebe

2、comeanincreasinglyprominentproblem.Todeveloplesspolluting,renewableenergyhasbecomethefocusofthecountriesenergystrategyinthe21stcentury.Theadvantagesofclean,evenlydistributed,richmakesolarenergybecomethefocusofthecountriesinthedevelopmentofnewenergy.Andthedeclineinthecos

3、tofsolarcellstomakephotovoltaic(PV)technologyhasbeendevelopingrapidly.Grid-connectedPVtechnologyisthemaindirectionofsolarpower.Thisarticlestudiesthetopologyandcontrolmethodsofthelow-powerphotovoltaicgrid-connectedsystem,andelaboratesthedesignofhardwareandsoftwareinlow-p

4、owerphotovoltaicgrid-connectedsystem.Firstly,thisarticleanalyzestheadvantagesanddisadvantagesofthevarioustopologiesindifferentpartsofthephotovoltaicgrid-connectedsystem,andsummarizestheprincipleofselectionofthegrid-connectedsystemtopology.Secondly,explainstheoperatingpr

5、incipleandseveralclassicalcontrolstrategies.Subsequently,non-isolatedtwo-stagestructureandthecorrespondingcontrolstrategyisadoptedforlow-powerphotovoltaicgrid-connectedsystem.Analyzethemathematicalmodelandcontrolsystemcalibration,deeplystudySPWM-baseddual-loopcontrolstr

6、ategy.ThentheMatlabsoftwareisusedtosimulatetheresultsandanalyzethecontrolperformance.Themaximumpowerpointtrackingtechnologyisoneofthekeytechnologiesofphotovoltaicpowergeneration.Inthepaper,onthebasisoftheanalysisofphotovoltaiccellscharacteristics,carryonafurtherresearch

7、onclassicMPPTtechnologies,andtheMatlabsoftwareisusedtosimulatetheeffectuponimprovementofthephotovoltaiccelloutputpower.Thedesignofthehardwareandsoftwareofthewholesystemisdetailed:includingthedesignofthemaincircuitofthesystemanditsparameters,thedesignofthecontrolcircuit,

8、theassignofthehardwareresourceandtheflowchartofthesoftwareofthesystem.Formakingthefrequencyandphaseofoutputcur