Izibalo ze-Solar Inverter String Design
I-athikili elandelayo izokusiza ukubala inani eliphezulu/elincane lamamojula ngochungechunge ngalunye lapho uklama isistimu yakho ye-PV. Futhi ubukhulu be-inverter buhlanganisa izingxenye ezimbili, i-voltage, nosayizi wamanje. Ngesikhathi sokulinganisa i-inverter udinga ukucabangela imingcele yokucushwa ehlukene, okufanele icatshangelwe lapho ulinganisa inverter yamandla elanga (Idatha evela ku-inverter kanye namashidi edatha yephaneli yelanga). Futhi ngesikhathi sokulinganisa, izinga lokushisa liyisici esibalulekile.
1. I-solar panel lokushisa i-coefficient ye-Voc / Isc:
I-voltage/yamanje amaphaneli elanga asebenza kuyo incike ekushiseni kweseli, izinga lokushisa liphezulu lapho i-voltage ephansi / yamanje izokhiqiza iphaneli yelanga bese ngokuphambene nalokho. I-voltage/yamanje yesistimu izohlala iphezulu kakhulu ezimeni ezibanda kakhulu futhi ngokwesibonelo, i-coefficient yokushisa yephaneli yelanga ye-Voc iyadingeka ukuze kulungiswe lokhu. Ngamaphaneli elanga e-mono kanye ne-poly crystalline kuhlale kuyisibalo esinegethivu esingu-%/oC, esifana -0.33%/oC ku-SUN 72P-35F. Lolu lwazi lungatholakala ephepheni ledatha labakhiqizi bephaneli yelanga. Sicela ubheke umfanekiso 2.
2. Inombolo yamaphaneli elanga ochungechungeni lweyunithi yezinhlamvu:
Lapho amaphaneli elanga enezintambo ezintanjeni zochungechunge (okuyi-positive yephaneli eyodwa exhunywe ku-negative yephaneli elandelayo), i-voltage yephaneli ngayinye yengezwa ndawonye ukuze inikeze isamba sentambo kagesi. Ngakho-ke sidinga ukwazi ukuthi mangaki amaphaneli elanga ohlose ukuwafaka izintambo ochungechungeni.
Uma usunalo lonke ulwazi usulungele ukukufaka kusilinganisi se-voltage yephaneli yelanga elandelayo kanye nokubala kosayizi bamanje ukuze ubone ukuthi umklamo wephaneli yelanga uzovumelana yini nezidingo zakho.
Ubukhulu Bamandla kagesi:
1. I-voltage enkulu yephaneli =Voc*(1+(Min.temp-25)*i-coefficient yezinga lokushisa(Voc)
2. Inombolo enkulu yamaphaneli elanga=Ubukhulu. I-voltage yokufaka / I-voltage yephaneli enkulu
Usayizi Wamanje:
1. Inani lamanje lephaneli =Isc*(1+(Max.temp-25)*i-coefficient yezinga lokushisa(Isc)
2. Inombolo enkulu yeyunithi yezinhlamvu=Ubukhulu. okokufaka kwamanje / okwamanje kwephaneli elincane
3. Isibonelo:
I-Curitiba, idolobha laseBrazil, ikhasimende selilungele ukufaka i-inverter eyodwa ye-Renac Power 5KW yezigaba ezintathu, imodeli yephaneli yelanga esetshenziswayo yimojula engu-330W, izinga lokushisa eliphansi ledolobha liyi--3 ℃ futhi izinga lokushisa eliphakeme lingu-35 ℃, elivulekile. I-voltage yesifunda ingu-45.5V, i-Vmpp ingu-37.8V, ububanzi be-voltage ye-MPPT inverter ingu-160V-950V, kanti amandla aphezulu angamelana 1000V.
Inverter kanye nedatha:
Idatha yephaneli yelanga:
A) Ubukhulu bamandla kagesi
Ezingeni lokushisa eliphansi kakhulu (kuncike endaweni, lapha -3℃ ), i-voltage ye-open-circuit engu-V oc yamamojula kuchungechunge ngalunye akumele idlule umkhawulo ophezulu we-voltage wokufaka we-inverter (1000 V):
1) Ukubalwa kwe-Open Circuit Voltage ku -3℃:
I-VOC (-3℃)= 45.5*(1+(-3-25)*(-0.33%)) = 49.7 Volt
2) Ukubalwa kuka-N inani eliphakeme lamamojula kuyunithi yezinhlamvu ngayinye:
N = I-voltage enkulu yokufaka (1000 V)/49.7 Volt = 20.12 (njalo yehlisa phansi)
Inani lamaphaneli elanga le-PV ochungechungeni ngalunye akumele lidlule amamojula angu-20 Ngaphandle kwalokho, ezingeni lokushisa eliphakeme kakhulu (incike endaweni, lapha 35℃), i-MPP voltage VMPP yeyunithi yezinhlamvu ngayinye kufanele ibe ngaphakathi kwebanga le-MPP lesiguquli samandla elanga (160V– 950V):
3) Ukubalwa kwe-Power Voltage VMPP ephezulu ku-35℃:
VMPP (35℃)=45.5*(1+(35-25)*(-0.33%))= 44 Volt
4) Ukubalwa kwenani elincane lamamojula M kuyunithi yezinhlamvu ngayinye:
M = Amandla kagesi amancane we-MPP (160 V)/ 44 Volt = 3.64 (hlala ejikeleza)
Inombolo yamaphaneli elanga e-PV kuyunithi yezinhlamvu kufanele okungenani ibe amamojula angu-4.
B) Usayizi Wamanje
Isekethe emfishane yamanje ye-I SC yohlelo lwe-PV akumele yeqe umthamo omkhulu ovunyelwe wokungena we-solar power inverter:
1) Ukubalwa kobuningi bamanje ku-35℃:
ISC (35℃)= ((1+ (10 * (TCSC /100))) * ISC ) = 9.22*(1+(35-25)*(-0.06%))= 9.16 A
2) Ukubalwa kuka-P inombolo enkulu yeyunithi yezinhlamvu:
P = Isilinganiso esiphezulu samanje (12.5A)/9.16 A = amayunithi ezinhlamvu angu-1.36 (njalo afinyezwa phansi)
Amalungu afanayo e-PV akumele eqe iyunithi yezinhlamvu eyodwa.
Phawula:
Lesi sinyathelo asidingeki ku-inverter MPPT eneyunithi yezinhlamvu eyodwa kuphela.
C) Isiphetho:
1. Ijeneretha ye-PV (uhlelo lwe-PV) luquketheumucu owodwa, exhunywe kusiguquli sesigaba sesithathu esingu-5KW.
2. Entanjeni ngayinye ama-solar panel axhunyiwe kufanele abengaphakathi kwamamojula angu-4-20.
Phawula:
Njengoba i-voltage ye-MPPT engcono kakhulu ye-inverter yezigaba ezintathu izungeze u-630V (amandla kagesi we-MPPT angcono kakhulu we-inverter yesigaba esisodwa azungeze u-360V), ukusebenza kahle kwesiguquli siphezulu kakhulu ngalesi sikhathi. Ngakho-ke kunconywa ukubala inani lamamojula welanga ngokusho kwe-MPPT voltage engcono kakhulu:
N = I-MPPT VOC / VOC ehamba phambili (-3°C) = 756V/49.7V=15.21
Iphaneli yekristalu eyodwa Best MPPT VOC =Amandla kagesi weMPPT angcono kakhulu x 1.2=630×1.2=756V
Iphaneli ye-Polycrystal ehamba phambili ye-MPPT VOC =Amandla kagesi we-MPPT angcono kakhulu x 1.2=630×1.3=819V
Ngakho-ke ku-Renac i-inverter yezigaba ezintathu i-R3-5K-DT amaphaneli elanga anconyiwe afaka amamojula ayi-16, futhi adinga nje ukuxhunywa intambo eyodwa 16x330W=5280W.
4. Isiphetho
Okokufaka kwe-inverter Inombolo yamaphaneli elanga kuya ngezinga lokushisa leseli kanye ne-coefficient yezinga lokushisa. Ukusebenza okuhle kakhulu kusekelwe ku-voltage ye-MPPT engcono kakhulu ye-inverter.