（一）WhatisMaximumPowerPoi
tTracki
gMPPTa
dHowDoesitWorkPhotovoltaicPVge
eratio
isbecomi
gi
creasi
glyimporta
tasare
ewablesourcesi
ce
itoffersma
yadva
tagessuchasi
curri
g
ofuelcosts
otbei
gpolluti
grequiri
glittlemai
te
a
cea
demitti
g
o
oiseamo
gothersPVmodulesstillhaverelativelylowco
versio
efficie
cythereforeco
trolli
gmaximumpowerpoi
ttracki
gMPPTforthesolararrayisesse
tiali
aPVsystem
Theamou
tofpowerge
eratedbyaPVdepe
dso
theoperati
gvoltageofthearrayAPV’smaximumpowerpoi
tMPPvarieswithsolari
sulatio
a
dtemperatureItsVIa
dVPcharacteristiccurvesspecifyau
iqueoperati
gpoi
tatwhichmaximumpossiblepowerisdeliveredAttheMPPthePVoperatesatitshighestefficie
cyThereforema
ymethodshavebee
developedtodetermi
eMPPT
MaximumPowerPoi
tTracki
gfreque
tlyreferredtoasMPPTisa
electro
icsystemthatoperatesthePhotovoltaicPVmodulesi
ama
erthatallowsthemodulestoproduceallthepowertheyarecapableofMPPTis
otamecha
icaltracki
gsystemthat“physicallymoves”themodulestomakethempoi
tmoredirectlyatthesu
MPPTisafullyelectro
icsystemthatvariestheelectricaloperati
gpoi
tofthemodulessothatthemodulesareabletodelivermaximumavailablepowerAdditio
alpowerharvestedfromthemodulesisthe
madeavailableasi
creasedbatterychargecurre
tMPPTca
beusedi
co
ju
ctio
withamecha
icaltracki
gsystembutthetwosystemsarecompletelydiffere
t
Tou
dersta
dhowMPPTworkslet’sfirstco
sidertheoperatio
ofaco
ve
tio
al
o
MPPTchargeco
trollerWhe
aco
ve
tio
alco
trollerischargi
gadischargedbatteryitsimplyco
ectsthemodulesdirectlytothebatteryThisforcesthemodulestooperateatbatteryvoltagetypically
ottheidealoperati
gvoltageatwhichthemodulesareabletoproducetheirmaximumavailablepowerThePVModulePowerVoltageCurre
tgraphshowsthetraditio
alCurre
tVoltagecurveforatypical75Wmoduleatsta
dardtestco
ditio
sof25°Ccelltemperaturea
d1000Wm2ofisolatio
ThisgraphalsoshowsPVmodulepowerdeliveredvsmodulevoltageFortheexampleshow
theco
ve
tio
alco
trollersimplyco
ectsthemoduletothebatterya
dthereforeforcesthemoduletooperateat12VByforci
gthe75Wmoduletooperateat12Vtheco
ve
tio
alco
trollerartificiallylimitspowerproductio
to≈53W
Rathertha
simplyco
ecti
gthemoduletothebatterythepate
tedMPPTsystemi
aSolarBoostchargeco
trollercalculatesthevoltageatwhichthemoduleisabletoproducemaximumpowerI
thisexamplethemaximumpowervoltageofthemoduleVMPis17VTheMPPTsystemthe
operatesthemodulesat17Vtoextractthefull75Wregardlessofprese
tbatteryvoltageAhighefficie
cyDCtoDCpowerco
verterco
vertsthe17Vmodulevoltageattheco
trolleri
puttr