Xisaabinta Naqshadaynta Xadhiga Inverter String
Maqaalka soo socda ayaa kaa caawin doona inaad xisaabiso ugu badnaan / tirada ugu yar ee modules kasta xadhig taxane ah marka aad naqshadaynayso nidaamka PV.Iyo cabbirka inverter-ku wuxuu ka kooban yahay laba qaybood, danab, iyo cabbirka hadda.Inta lagu jiro cabbirka beddelka waxaad u baahan tahay inaad tixgeliso xaddidaadaha qaabeynta ee kala duwan, taas oo ay tahay in la tixgeliyo marka la cabbirayo beddelka tamarta qoraxda (Xogta ka soo baxda xogta beddelka iyo guddiga qoraxda).Iyo inta lagu jiro cabbirka, isku-dhafka heerkulku waa arrin muhiim ah.
1. Isku-xidhka heerkulka ul-qodaxda ee Voc/Isc:
Korontada/hadda ay ku shaqeeyaan baalayaasha qoraxda waxay ku xiran tahay heerkulka unugga, marka uu heerkulku sareeyo waxaa hoos u dhigaya danabka/ hadda talefoonka qoraxda ayaa soo saari doona oo ka duwan.Korontada/ hadda nidaamku wuxuu had iyo jeer ahaan doonaa meesha ugu sarreysa xaaladaha ugu qabow iyo tusaale ahaan, isku xidhka heerkulka cadceedda ee Voc ayaa loo baahan yahay si tan looga shaqeeyo.Iyada oo leh muraayadaha cadceedda ee mono iyo poly crystalline mar walba waa mid taban%/oC, sida -0.33%/oC ee SUN 72P-35F.Macluumaadkan waxaa laga heli karaa xaashida xogta soosaarayaasha leylaha cadceedda.Fadlan tixraac sawirka 2.
2. Tirada baararka cadceedda ee xadhig taxane ah:
Marka muraayadaha cadceedda lagu xidho xadhig taxane ah (taasi waa togan ee hal guddi waxay ku xidhan tahay taban ee guddida soo socota), tamarta guddi kasta ayaa la isku daraa si loo helo wadarta tamarta xadhigga.Sidaa darteed waxaan u baahanahay in aan ogaano inta leerarka cadceedda aad rabto in aad si taxane ah u silciso.
Markaad haysatid dhammaan macluumaadka waxaad diyaar u tahay inaad geliso cabbirka tamarta tamarta qoraxda ee soo socota iyo xisaabinta cabbirka hadda jirta si aad u aragto haddii nashqada cadceedda ay ku habboon tahay shuruudahaaga.
Cabbirka Korantada:
1. Qulqulka ugu badan ee panel = Voc*(1+(Min.temp-25)* heerkulka heerkulka (Voc)
2. Tirada ugu badan ee Solar panels=Max.danab gelinta / Max panel ee danab
Cabbirka Hadda:
1. Min panel's current = Isc*(1+(Max.temp-25)*heterature coefficient(Isc)
2. Tirada ugu badan ee xargaha=Max.gelinta hadda / Min guddida hadda
3. Tusaale:
Curitiba, magaalada Brazil, macmiilku wuxuu diyaar u yahay inuu ku rakibo hal Renac Power 5KW saddex weji rogaal celiye ah, qaabka la isticmaalayo muraayadda qorraxda waa moduleka 330W, heerkulka ugu hooseeya ee magaalada waa -3℃ iyo heerkulka ugu badan waa 35℃, furan danab wareegga waa 45.5V, Vmpp waa 37.8V, kala duwan ee danab inverter MPPT waa 160V-950V, iyo danab ugu badnaan wuxuu u adkeysan karaa 1000V.
Wareegtada iyo xaashida xogta:
Xaashida xogta panel-ka cadceedda:
A) Cabbirka korantada
Heerkulka ugu hooseeya (goobta ku tiirsan, halkan -3 ℃), korantada furan ee wareegga V oc ee modules kasta waa in aanu dhaafin tamarta ugu badan ee rookaha (1000 V):
1) Xisaabinta Korantada Wareegga Furan ee -3℃:
VOC (-3℃)= 45.5*(1+(-3-25)*(-0.33%)) = 49.7 Volt
2) Xisaabinta N tirada ugu badan ee modules ee xadhig kasta:
N = Volt-ga ugu sarreeya (1000 V) / 49.7 Volt = 20.12 (mar walba hoos u dhig)
Tirada cadceedda PV ee xadhig kasta waa in aanay ka badnayn 20 modules Ka sokow, at heerkulka ugu sarreeya (goobta ku tiirsan, halkan 35 ℃), danab MPP VMPP ee xadhig kasta waa in ay ku dhex jira xadka MPP ee rookaha tamarta qoraxda (160V- 950V):
3) Xisaabinta ugu badan ee Voltage VMPP at 35 ℃:
VMPP (35℃)=45.5*(1+(35-25)*(-0.33%))= 44 Volt
4) Xisaabinta tirada ugu yar ee cutubyada M ee xadhig kasta:
M = Min MPP danab (160 V) / 44 Volt = 3.64 (mar walba la soo koobo)
Tirada cadceedda PV ee xadhig kasta waa inay ahaadaan ugu yaraan 4 qaybood.
B) Qiyaasta Hadda
Wareegga gaaban ee hadda I SC ee soo diyaariyeen PV waa in aanu dhaafin inta ugu badan ee la ogol yahay Input hadda ee korontada qoraxda:
1) Xisaabinta ugu badnaan Hadda oo ah 35 ℃:
ISC (35℃)= ((1+ (10 * (TCSC/100)))) * ISC = 9.22*(1+(35-25)*(-0.06%))= 9.16 A
2) Xisaabinta P tirada ugu badan ee xargaha:
P = gelinta ugu badan ee hadda (12.5A) / 9.16 A = 1.36 xargaha (mar walba hoos u soo wareeji)
Qaabka PV waa inuusan dhaafin hal xarig.
Odhaah:
Tallaabadan loogama baahna MPPT-ga rogayaasha leh hal xadhig oo keliya.
C) Gabagabo:
1. Dhaliyaha PV (PV array) wuxuu ka kooban yahayhal xadhig, kaas oo ku xidhan saddexda weji ee 5KW rogaaliyaha.
2. Xadhig kasta waa inay ahaadaan muraayadaha qorraxda ee isku xirangudahood 4-20 modules.
Odhaah:
Maaddaama korantada MPPT ee ugu fiican ee saddexda wejiga rogaha ay ku dhowdahay 630V (kuwa ugu wanaagsan ee MPPT ee wareegga wareegga hal weji waa 360V), hufnaanta shaqo ee beddelka ayaa ah tan ugu sarreysa waqtigan.Marka waxaa lagu talinayaa in la xisaabiyo tirada modules qoraxda iyadoo loo eegayo danab MPPT ugu fiican:
N = MPPT VOC/VOC ugu fiican (-3°C) = 756V/49.7V=15.21
Gole quraarad ah ee ugu wanaagsan MPPT VOC = danab MPPT ugu fiican x 1.2=630×1.2=756V
Dabaqa polycrystal ugu fiican MPPT VOC = danab MPPT ugu fiican x 1.2=630×1.3=819V
Markaa Renac saddexda weji rogaye R3-5K-DT talooyinka lagu soo geliyo qoraxda waa 16 qaybood, oo kaliya waxay u baahan yihiin in lagu xidho hal xadhig 16x330W=5280W.
4. Gabagabo
Gelida rogayaasha Maya ee muraayadaha qorraxda waxay ku xiran tahay heerkulka unugga iyo isku-beegga heerkulka.Waxqabadka ugu fiican wuxuu ku salaysan yahay korantada MPPT ee ugu fiican ee beddelka.