Solar Inverter String Design xam zauv
Cov kab lus hauv qab no yuav pab koj xam qhov siab tshaj plaws / yam tsawg kawg nkaus ntawm cov modules ib txoj hlua khi thaum tsim koj lub PV system.Thiab lub inverter sizing muaj ob ntu, voltage, thiab tam sim no sizing.Thaum lub sij hawm inverter sizing koj yuav tsum coj mus rau hauv tus account qhov txawv configuration txwv, uas yuav tsum tau txiav txim siab thaum sizing lub hnub ci zog inverter (Cov ntaub ntawv los ntawm lub inverter thiab solar vaj huam sib luag ntaub ntawv nplooj ntawv).Thiab thaum lub sij hawm sizing, kub coefficient yog ib qho tseem ceeb.
1. Hnub ci vaj huam sib luag kub coefficient ntawm Voc / Isc:
Qhov hluav taws xob / tam sim no uas lub hnub ci vaj huam sib luag ua haujlwm yog nyob ntawm qhov ntsuas kub ntawm tes, qhov siab dua qhov kub ntawm qhov hluav taws xob qis / tam sim no lub hnub ci vaj huam sib luag yuav tsim thiab vice versa.Qhov voltage / tam sim no ntawm lub kaw lus yuav ib txwm nyob ntawm nws qhov siab tshaj plaws hauv qhov txias tshaj plaws thiab piv txwv li, lub hnub ci vaj huam sib luag qhov kub thiab txias coefficient ntawm Voc yuav tsum ua kom tiav qhov no.Nrog mono thiab poly crystalline hnub ci vaj huam sib luag nws ib txwm muaj qhov tsis zoo % / oC daim duab, xws li -0.33% / oC ntawm SUN 72P-35F.Cov ntaub ntawv no tuaj yeem pom ntawm daim ntawv qhia hnub ci vaj huam sib luag manufacturers.Thov saib daim duab 2.
2. Tsis muaj hnub ci vaj huam sib luag hauv cov hlua series:
Thaum lub hnub ci vaj huam sib luag yog wired nyob rau hauv series cov hlua (uas yog qhov zoo ntawm ib lub vaj huam sib luag yog txuas nrog qhov tsis zoo ntawm lub vaj huam sib luag tom ntej), qhov voltage ntawm txhua lub vaj huam sib luag yog ntxiv ua ke kom muab tag nrho cov hlua hluav taws xob.Yog li ntawd peb yuav tsum paub yuav ua li cas muaj ntau yam hnub ci vaj huam sib luag koj npaj yuav xaim nyob rau hauv series.
Thaum koj muaj tag nrho cov ntaub ntawv koj tau npaj nkag mus rau hauv cov nram qab no lub hnub ci vaj huam sib luag voltage sizing thiab tam sim no sizing xam saib seb lub hnub ci vaj huam sib luag tsim yuav haum koj cov kev xav tau.
Voltage Qhov Loj:
1. Max vaj huam sib luag voltage =Voc*(1+(Min.temp-25)* kub coefficient(Voc)
2. Max tus naj npawb ntawm Solar panels = Max.input voltage / Max vaj huam sib luag voltage
Tam sim no qhov loj me:
1. Min vaj huam sib luag tam sim no =Isc*(1+(Max.temp-25)* kub coefficient(Isc)
2. Max tus naj npawb ntawm cov hlua = Max.input tam sim no / Min vaj huam sib luag tam sim no
3. Piv txwv:
Curitiba, lub nroog ntawm Brazil, cov neeg siv khoom tau npaj rau nruab ib lub Renac Fais Fab 5KW peb theem inverter, siv lub hnub ci vaj huam sib luag qauv yog 330W module, qhov tsawg kawg nkaus kub ntawm lub nroog yog -3 ℃ thiab qhov siab tshaj plaws kub yog 35 ℃, qhib Circuit Court voltage yog 45.5V, Vmpp yog 37.8V, inverter MPPT voltage ntau yog 160V-950V, thiab qhov siab tshaj plaws voltage tuaj yeem tiv taus 1000V.
Inverter thiab Datasheet:
Daim ntawv thov ntawm solar panels:
A) Voltage Sizing
Ntawm qhov ntsuas kub qis tshaj (qhov chaw nyob ntawm no -3 ℃), qhov qhib hluav taws xob voltage V oc ntawm cov modules hauv txhua txoj hlua yuav tsum tsis pub tshaj qhov siab tshaj plaws input voltage ntawm inverter (1000 V):
1) Kev suav ntawm Qhib Circuit Court Voltage ntawm -3 ℃:
VOC (-3 ℃) = 45.5 * (1 + (-3-25) * (-0.33%)) = 49.7 Volt
2) Kev suav ntawm N qhov siab tshaj plaws ntawm cov modules hauv txhua txoj hlua:
N = Max input voltage (1000 V) / 49.7 Volt = 20.12 (ib txwm puag ncig)
Tus naj npawb ntawm hnub ci PV panels hauv txhua txoj hlua yuav tsum tsis pub tshaj 20 modules Tsis tas li ntawd, ntawm qhov kub siab tshaj (qhov chaw nyob ntawm no 35 ℃), MPP voltage VMPP ntawm txhua txoj hlua yuav tsum nyob rau hauv MPP ntau ntawm lub hnub ci zog inverter (160V- 950V):
3) Kev suav ntawm lub zog siab tshaj plaws VMPP ntawm 35 ℃:
VMPP (35 ℃) = 45.5 * (1 + (35-25) * (-0.33%)) = 44 Volt
4) Kev suav ntawm qhov tsawg kawg nkaus ntawm modules M hauv txhua txoj hlua:
M = Min MPP voltage (160 V) / 44 Volt = 3.64 (ib txwm puag ncig)
Tus naj npawb ntawm hnub ci PV panels hauv txhua txoj hlua yuav tsum yog tsawg kawg 4 modules.
B) Tam sim no Sizing
Qhov luv luv Circuit Court tam sim no I SC ntawm PV array yuav tsum tsis pub tshaj qhov tso cai siab tshaj plaws tam sim no ntawm lub hnub ci zog inverter:
1) Kev suav ntawm qhov siab tshaj plaws tam sim no ntawm 35 ℃:
ISC (35 ℃) = ((1 + (10 * (TCSC / 100))) * ISC ) = 9.22 * (1 + (35-25) * (-0.06%)) = 9.16 A
2) Kev suav ntawm P qhov siab tshaj plaws ntawm cov hlua:
P = Maximum input tam sim no (12.5A) / 9.16 A = 1.36 hlua (ib txwm puag ncig)
PV array yuav tsum tsis pub tshaj ib txoj hlua.
Lus Cim:
Cov kauj ruam no tsis yog yuav tsum tau rau lub inverter MPPT nrog tsuas yog ib txoj hlua.
C) Cov ntsiab lus:
1. Lub tshuab hluav taws xob PV (PV array) muajib riv, uas txuas nrog peb theem 5KW inverter.
2. Nyob rau hauv txhua txoj hlua txuas txuas hnub ci vaj huam sib luag yuav tsum yoghauv 4-20 modules.
Lus Cim:
Txij li qhov zoo tshaj plaws MPPT voltage ntawm peb theem inverter yog nyob ib ncig ntawm 630V (zoo tshaj MPPT voltage ntawm ib theem inverter yog nyob ib ncig ntawm 360V), kev ua hauj lwm efficiency ntawm lub inverter yog siab tshaj nyob rau lub sij hawm no.Yog li nws pom zoo kom suav cov hnub ci modules raws li qhov zoo tshaj plaws MPPT voltage:
N = Qhov zoo tshaj plaws MPPT VOC / VOC (-3 ° C) = 756V / 49.7V = 15.21
Ib leeg siv lead ua vaj huam sib luag Zoo tshaj MPPT VOC = Zoo tshaj MPPT voltage x 1.2 = 630 × 1.2 = 756V
Polycrystal vaj huam sib luag Zoo tshaj MPPT VOC = Zoo tshaj MPPT voltage x 1.2 = 630 × 1.3 = 819V
Yog li rau Renac peb theem inverter R3-5K-DT pom zoo cov tswv yim hnub ci vaj huam sib luag yog 16 modules, thiab tsuas yog yuav tsum tau txuas ib txoj hlua 16x330W = 5280W.
4. Cov lus xaus
Inverter input Tsis muaj hnub ci vaj huam sib luag nws nyob ntawm qhov kub thiab txias coefficient ntawm tes.Qhov kev ua tau zoo tshaj plaws yog nyob ntawm qhov zoo tshaj plaws MPPT voltage ntawm inverter.