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15thInternationalPhotovoltaicScience&EngineeringConference(PVSEC-15)ShanghaiChina200510-2178TheFirst10kWGrid-ConnectedBIPVStationonQinghai-TibetanPlateauLiuHong1ChenHuiling2ZhangZhimin31QinghaiProvincialNewEnergyResearchInstitute,Xining810008,P.R.China,E-Mail:qhliuhong@163.com2QinghaiProvincialNewEnergyResearchInstitute,Xining810008,P.R.China,E-Mail:chl_qy@163.com3QinghaiProvincialNewEnergyResearchInstitute,Xining810008,P.R.China,E-Mail:qhneri@public.xn.qh.cnAbstract:Nowadays,BuildingIntegratedPhotovoltaic(BIPV)techniquehasbecomeoneofthemainmeansinphotovoltaicfieldintheworld.InChina,suchresearchanddemonstrationjuststarted.OnQinghai-TibetanPlateau,solarenergyresourceisabundant,andQinghaiProvincebecomeoneofimportantareasforsolarenergyapplication.InthispaperoneofresearchtopicfundedbytheNationalScienceandTechniqueMinistry,10KWgrid-connectedBIVPstationfordemonstration,isintroduced,includingprincipleoflayout,systemdesign,preliminarydatumandanalysisfromshorttimeoperationofstation.KeyWords:photovoltaic,solarenergy,buildingintegratedphotovoltaic(BIPV).1IntroductionNowadays,buildingintegratedphotovoltaictechniquehasbecomeoneofthemainmeansofphotovoltaicfieldintheworld.Thegrid-connectedsolarphotovoltaicapplicationisusedmorethanstand-aloneapplication,andyearlyincreasespeedisover40%.Herebuildingintegratedphotovoltaictechniqueisthemainformat.RepresentedbyChineseTownshipElectrificationProgram,greatsuccessonstand-alonephotovoltaicapplicationhasachievedinChina.However,forthebuildingintegratedphotovoltaictechnique,Chinajuststartedit’spacegointotechnicalpreparationstage,onlyafewdemonstrativesystemshavebeenbuilt.RecentlychinesegovernmenthaspublishedtheRenewableEnergyLawandhasmadegreatdeterminationtoapplyphotovoltaictechniqueinlargescale.TheNationalScienceandTechniqueMinistryhasassignedaprojectonbuildingintegratedphotovoltaic.OnQinghai-TibetanPlateau,thereisveryrichsolarresource.Qinghaiisoneoftheimportantareasforsolarenergyapplication.The10KWgrid-connectedBIPVstationfordemonstrationprojectfundedbytheNationalScienceandTechniqueMinistryisthefirstbuildingintegratedphotovoltaicdemonstratingsystemonQinghai-TibetanPlateau.2PrincipleofLayout2.1Researching2.2Demonstrating3SystemDesign3.1SiteChoiceAftercomparison,theofficebuildingofQinghaiProvincialNewEnergyResearchInstitutelieinXiningcitywaschosenasthesite,forwhichisbythemainstreetinthecityandit’ssouthernsidedirectlytowardsthestreet.Thesiteisinlongitude101°46’east,latitude36°37’north,withaltitudeof2261meter.Fig.1showsthesceneofthestation.(omitted)Fig.110kWpgrid-connectedBIPVstation3.2DesignofPVArray1)ChooseofPVModules.2)CombinationofPVModuleswithBuilding.ThedesignofthestationfullyusedthepolygonalshapeoftheofficebuildingofQNERI,whichhas3directionsinsouthernsideofthewall.Therearesouthside(witha25°deflectionfromsouthtowest),southdeflectedwestside(withadeflectionof68°),andsouthdeflectedeast(withadeflectionof18°).Mono-crystal,multi-crystal,amorphoussiliconmoduleswereinstalledonthespacesbetweenwindowsonthesouthwall.SeetheFig.2,everytypemodulewereinstalledinsamelevelinabove-mentioned3directions,theresultwereintheeverydirection,thereweredifferentmodules,aswellasdifferentmoduleswereinstalledindifferentdirection.Furthermore,theofficebuildinghasaspecialadvantagethatthewallofeasttowardssidewasshelteredeverymorning.Thisadvantagewasusedfullythroughputtingmono-crystal,multi-crystal,amorphoussiliconmodulesmoduleonittostudyoutputcharacteristicsofallkindsofmodulesundershadowing.SeeinFig.3.Half-transparentsiliconmoduleswereinsteadofsomeglassofwindowsinthe7th,8thand9thfloorsofthebuildingonlyasanapplicationdemonstrationofthistypemodule.(omitted)Fig.2Modulesinstalledin3differentdirections(omitted)Fig.3modulesundershadowingThetotalcapacityofthestationis10KWp,amongwhich,thecapacityofamorphoussiliconmoduleis2592Wp,mono-crystalsiliconmoduleis2296Wp,multi-crystalsiliconmoduleis2960Wpandhalf-transparentmoduleis1496Wp.Tab.1showsthecapacityofdifferentPVmodulesindifferentdirection.Tab.1CapacityofdifferentPVmodulesindifferentdirection(omitted)3.3ChooseofInverter3.4Grid-ConnectedDesign3.5DataCollectionandMonitoringSystem1794PreliminaryDatumandAnalysisfromTheSystemOperation4.1PreliminaryDatumofTheSystemOperation1)OutputPowerofDifferentPVModulesunderTheSameCondition(seeFig.4).00.511.522.513581014161822242830[Day]kWh/kWamorphousmulti-crystalsinglecrystalFig.4(a)Outputpowerofmono-crystal,multi-crystal,andamorphoussiliconPVmodulesonwestdeflectedside00.511.522.5313581014161822242830[Day]kWh/kWamorphousmulti-crystalsinglecrystalFig.4(b)Outputpowerofmono-crystal,multi-crystal,andamorphoussiliconPVmodulesoneastdeflectedside00.511.522.533.544.513581014161822242830[Day]kWh/kWamorphousmulti-crystalsingle-crystalFig.4(c)Outputpowerofmono-crystal,multi-crystal,andamorphoussiliconPVmodulesonsouth2)OutputPowerofSameModulesunderDifferentInstallationSituation(seeFig.5).00.511.522.533.5413581014161822242830[Day]kWh/kWwestdeflectedsoutheastdeflectedsouthsouthFig.5(a)Outputpowerofmono-crystalsiliconPVmoduleindifferentdirections00.511.522.533.544.513581014161822242830[Day]kWh/kWwestdeflectedsoutheastdeflectedsouthsouthFig.5(b)Outputpowerofmulti-crystalsiliconPVmoduleindifferentdirections(omitted)Fig.5(c)OutputpowerofamorphoussiliconPVmoduleindifferentdirections3)OutputPowerofModulesunderShadowing(seeinFig.6)(omitted)Fig.6Dailyoutputpowerofdifferentmodulesundershadowing4.2PreliminaryAnalysis5ConclusionsThestationwasputintooperationinthebeginningof2005,ithasbeingrunsmoothly.Atthesametime,alargenumberofrelateddatahasbeencollected.Throughtheoperationforthesemonths,itattestedthatthesystemwasrationallydesigned.Thisdemonstratingprojecthasreallymadeagoodcontributionforpeopletoknowandunderstandmoreaboutphotovoltaictechnique,esp.aboutbuildingintegratedphotovoltaictechnique.