光钛发电系统逆变器控制及其孤岛检测

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1、浙江工业大学硕士学位论文INVERTERCoNTRoLANDISLANDINGDETECTIoNoFPHoToVoLTAICGENER』▲TIoNSYSTEMABSTRACTWiththeiIlcreasingconcemaboutglobalenV的呦entaIprotection，thesolarenergy，cle踟，pollution-f．reeandinexhaustible，haSreceiVed孕．eatinterestasanaltematiVesourCe0fene噌：)，forthe

2、mtllre．In觚e仃orttousethesolarenergyefrectiVely，a伊eatdealofresearChhasbeendoneonthephotoVoltaic(PV)generationsystems．Tllisdissertationfocuseson铆ostageofsingle-phase鲥d-co衄ectedPVsystem．TllephotoVoltaica11ray，tllemaXim啪powerpoint臼．acking(MPPT)strategyandisl锄

3、dingdetectionmethodhaVebeeninVestigated．ThemainworkandachieVementsinthisdissenationare弱folIows：(1)111emodelofmephotoVol谢ccellsis锄alyzedandverifiedbysiIIlulation．Tlleresultshowsmat，witlltlleVoItageincreasing，t11eou印utpowerofphotoVoltaiccellsincreasesfirst

4、lyanddecreasesaRen)l，aurdS，whichproVidestheb舔isforMPPT．ThePerturb&observealgorithmofMPPTisselectedtosimulate．Thepowerofthesystemhassmallfluctuationintherangeofthemaximumwhenitreachesattheofthema)【imumpowcrpointpower．(2)TheinVerterin鲥d-connectedPVisimport

5、锄tsinceitisrelatedtothepowerqualit)，ofthesyst锄’soutput．Inthisdissertation，majorattentionisgiVentomehysteresiscunIent-con仃olledmethod锄dSPWMmethod．ComparingthesimulationresultSofhysteresiscun．ent-con仃olledmetllodwithSPWMmethod，thelatterisbettersincemeinven

6、er’soutputisunitypowerf．actor．(3)Amodeloftwo-stagesingle—phasePVsystemisbuiltupbasedonthesimulationofPVcells，meBoostcircuit觚dinverter．Thesimulationresultdemonstratesthattheoutputclln．entoftlleinVerterisinphasewithgridVoltagea1Fteraperiodofadjustment．(4)A

7、nti—islandingprotectionplaysanimponantmlein伊id-connectedPVsystem．Thisdissenationpr0Videsprofoundresearchont11eslipmode厅equencyshilFtmethod(SMS)锄dactiVefIrequencyshiRmethod(AFD)．SimulationsoftheAFDmethodwiththesingleinverterandthefiVe-leVelcascadedinVener

8、arewhoseresultstum0ulthatthercspectiVelype雨舯ed，AFDmethodwithfiVe-levelcascadedinVenerisstilleffectiVe，althoughthedetectiontimeisii浙江工业大学硕上学位论文longerthantheAFDmethodwiththesingleinVener．Keywords：g—d-connectedPVsystem，PVcell