Energy Efficiency Analysis of Grid-Connected Ph...

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1、EnergyEfficiencyAnalysisofGrid-ConnectedPhotovoltaicInverterwithStorageBattery1,212CheeLimNge,Ole-MortenMidtgård,LarsNorum1UNIVERSITYOFAGDER4876Grimstad,Norway2NORWEGIANUNIVERSITYOFSCIENCEANDTECHNOLOGY7491Trondheim,NorwayE-Mail:chee.l.nge@uia.noAcknowledgemen

2、tsTheresearchunderlyingthispaperwassupportedbyResearchCouncilofNorwayandElkemSolar.TheauthorsaregratefulforthePVoutdoormeasurementdatasharedbyGeorgiHristovYordanov.KeywordsPhotovoltaic,EnergyStorage,Efficiency.AbstractPVisanintermittentrenewablepowersource.Gr

3、id-connectedPVinvertersconventionallyusegridastheenergyreservoir.AsthelevelofPVpenetrationincreasessubstantiallyinrecentyears,batteryisproposedastheenergystorageingrid-connectedPVsystem.Thisistoincreaseon-siteconsumption,whichinturnavoidsgridvoltageriseandred

4、ucesthelossintransmissionline.Additionally,itallowsPVinvertertodispatchpowersimilartotheconventionalpowergenerations.Thispaperanalyzestheoverallefficiencyofgrid-connectedPVinverterwithstoragebatteryusingsystemlevelregressionmodels.Theanalysispostulatesnonline

5、arrelationbetweenthetotalpowerlossandthebatterycharging.Voltagedroopbatterychargecontrollerthatsimplifiestheefficiencyoptimizationisdevelopedbasedontheregressionmodels.Theanalysisandthecontrollerareverifiedbythecomponentlevelpowerlosscalculations.Thecontrolle

6、riscomparedinsimulationtotheconventionalconstant-current/constant-voltagebatterychargingusingPVoutdoormeasurementdata.IntroductionGlobalinstallationofphotovoltaic(PV)systemhasgrownsubstantiallyinrecentyears[1].PVishoweveranintermittentpowersource.Theconventio

7、nalgrid-connectedsystemfeedspowerintothegridwhenPVgeneratesandthelocalloaddrawselectricityfromthegridwhenPVceasesgeneration.Thegridasenergyreservoirisinefficientduetothelossintransmissionline.ThisbecomesaneconomicdrawbackasthelevelofPVpenetrationincreasesinco

8、untriesthatimplementPVfeed-intariffs.TherecentrevisionofRenewableEnergyActinGermanyintroducesdifferenttariffsinordertoencourageon-siteconsumption[2],[3].Batteryasenergystorageisproposedto