Evaluation of performance of MPPT devices in PV systems with storage batteries.docx
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Evaluation of performance of MPPT devices in PV systems with storage batteries.docx
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EvaluationofperformanceofMPPTdevicesinPVsystemswithstoragebatteries
EvaluationofperformanceofMPPTdevicesinPVsystemswithstoragebatteries
WeiChena,b,
HuiShenc,,
BifenShuc,
HongQind,
TaoDengc
aSolarEnergyLaboratory,GuangzhouInstituteofEnergyconversion,ChineseAcademyofSciences,Guangzhou510640,People'sRepublicofChina
bDepartmentofthermalscienceandenergyengineering,UniversityofScienceandTechnologyofChina,Hefei230026,People'sRepublicofChina
cSolarsystemresearchinstitute,SunYat-SENUniversity,Guangzhou510275,People'sRepublicofChina
dFacultyofMaterialandEnergy,GuangdongUniversityofTechnology,Guangzhou510090,People'sRepublicofChina
Received1January2006.Accepted1June2006.Availableonline5February2007.
http:
//dx.doi.org/10.1016/j.renene.2006.06.009,HowtoCiteorLinkUsingDOI
CitedbyinScopus(14)
Permissions&Reprints
Abstract
InthePVsystemwithstoragebatteries,asamaximumpowerpointtracking(MPPT)deviceisusedtoenhancebatterycharging,theenhancementmustbegreaterthantheinternallossofthedeviceitself,ortherewillbenonetgainatall.ToevaluatetheMPPTdevicebenefitsunderdifferentclimate,thetheoreticalcalculationmodelshavebeenconstructed.Bysimulation,acomparativestudybetweentwotypesofPVchargecontrollerswithandwithoutaMPPTdeviceunderdifferentatmosphericconditionswaspresented.ThecomparisonwasmadebymeansoftheenergyproductionobtainedfromthePVgeneratorofeachsystem.TheclimaticconditonsofBeijingandGuangzhouinChinahavebeenregarded.FromtheresultsobtaineditcanbeconcludedthattheeffectivenessoftheMPPTdeviceinGuangzhouisnotveryobvious,howevertheMPPTdevicedidgreatlyenhancetheoutputinBeijinginthewinter.
Keywords
PVsystems;
Storagebatteries;
MPPT;
Matchingfactor
Nomenclature
HT
totalirradianceincidentontiltedsurface(W/m2)
H
totalirradianceincidentonhorizontalsurface(W/m2)
HB
directradiationincidentonhorizontalsurface(W/m2)
HD
diffuseradiationincidenthorizontalsurface(W/m2)
T
operatingcelltemperature(K)
Iph
generatedcurrentunderagiveninsolation(A)
Id
forwarddiodecurrent(A)
Ish
currentflowinginlumpedshuntresistance(A)
ISC0
short-circuitcurrentatthestandardtestcondition(A)
RS
lumpedseriesresistanceofthePVarray(Ω)
RSH
lumpedshuntresistanceofthePVarray(Ω)
NS
numbersofsolarcellsconnectedinseries
VL
terminalvoltageofthebattery(V)
IL
outputcurrentdeliveredbythePVarray(A)
Vmp
PVarraymaximumpowervoltage(V)
Imp
PVarraymaximumpowercurrent(A)
Pmp
instantaneouspowergeneratedbythePVarrayatmaximumpowerpoint(W)
PMPPT
actualoutputpowerofthePVarraywithMPPTdevice(W)
PL
outputpowerofthePVarraywithdirectlybatterycharging(W)
EL
energydeliveredfromthePVarraywithdirectlybatterycharging(Wh)
EMPPT
actualoutputpowerofthePVarraywithMPPTdevice(Wh)
Emax
maximumavailableenergygeneratedbythePVarray(Wh)
GreekLetters
θi
incidenceangleoflightrays(deg)
θz
zenithangle(deg)
β
tiltangleofplanetoground(deg)
δ
declinationofthesun(deg)
Φ
latitude(deg)
γ
azimuthangleofinclinedplane(deg)
γS
solarazimuthangle(deg)
ηM
efficiencyofMPPTdevice(%)
μ
matchingfactorofthePVarray(%)
1.Introduction
PVapplicationsmayofferapromisingalternativeenergysupplyinremoteareas.Inmanyplacesduetoremotenessandcost,itisunlikelythatmaingridconnectionwilleverbeestablished.However,theneedforpowerstillexists.Inmostcases,storagebatteriesareincludedinPVsystemsduetothefluctuatingnatureoftheclimaticconditions.ThecapitalcostofPVgeneratorsishighandtheirperformancedependsgreatlyontheirradiation,thetemperature,andthebatteryvoltagethatchangesduringitschargeanddischargeprocess.Becausetheusersrequirethemaximumavailableoutputpowerunderanytemperatureandsolarradiationlevels,aMPPTdevicemaybelocatedbetweenthePVarrayandbatteriestooptimizethepowertransferfromthePVarraytothebatteries.Withthedevelopmentoftechnology,MPPTdevicescanbemorecost-effective,haveahigherreliabilityandefficiency.ThiswillresultinatotalPVsystemthatismuchmoreeconomicallyviableand,therefore,suitableforawiderapplicationbaseforremoteelectrification.
ComparedwithusingaMPPTdevice,directcouplingofbatterytoPVarrayisconsideredamorereliableandless-expensivemethodofconnection,therefore,theaddedcostoftheMPPTdeviceshouldbelowerthantheestimatedsavingsofthesystemcostduetohigher-energyoutputfromthesamePVarray.PVmodulesareusuallydesignedtochargetypical12 Vbatteries,thenumberofsolarcellsinse
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