Mawerengedwe a Kapangidwe ka Solar Inverter String Design
Nkhani yotsatirayi ikuthandizani kuwerengera kuchuluka / kuchepera kwa ma module pa chingwe chilichonse popanga makina anu a PV. Ndipo kukula kwa inverter kumakhala ndi magawo awiri, ma voltage, ndi kukula kwapano. Pa inverter sizing muyenera kuganizira malire kasinthidwe osiyana, amene ayenera kuganiziridwa pamene sizing ndi dzuwa mphamvu inverter (Deta kuchokera inverter ndi dzuwa gulu deta mapepala). Ndipo panthawi ya kukula, kutentha kwapakati ndi chinthu chofunikira.
1. Solar panel kutentha kokwana kwa Voc / Isc:
Magetsi/panopa omwe mapanelo adzuwa amagwira ntchito amadalira kutentha kwa ma cell, kutentha kumapangitsa kuti magetsi azitsika kwambiri / pakali pano gulu la solar limatulutsa ndikusinthanso. Magetsi/panopa pamakinawa nthawi zonse amakhala pamalo ozizira kwambiri ndipo mwachitsanzo, gawo la kutentha kwa solar la Voc likufunika kuti izi zitheke. Ndi ma solar a mono ndi poly crystalline solar nthawi zonse imakhala yoyipa %/oC, monga -0.33%/oC pa SUN 72P-35F. Izi zitha kupezeka patsamba la opanga ma solar panel. Chonde onani chithunzi 2.
2. Chiwerengero cha mapanelo adzuwa pamndandanda:
Pamene mapanelo a dzuwa ali ndi mawaya mu zingwe zotsatizana (ndiko kuti zabwino za gulu limodzi zimalumikizidwa ndi zoyipa za gulu lotsatira), voteji ya gulu lililonse imawonjezedwa palimodzi kuti ipereke mphamvu yonse ya chingwe. Chifukwa chake tikuyenera kudziwa kuti ndi ma solar angati omwe mukufuna kuwaya motsatizana.
Mukakhala ndi zidziwitso zonse ndinu okonzeka kulowa mu solar panel saizi yamagetsi ndi mawerengedwe apano kuti muwone ngati kapangidwe ka solar panel kakugwirizana ndi zomwe mukufuna.
Kukula kwa Voltage:
1. Magetsi a Max panel =Voc*(1+(Min.temp-25)*temperature coefficient(Voc)
2. Chiwerengero chochulukira cha ma sola=Max. voliyumu yolowera / Mphamvu ya Max panel
Kukula Kwamakono:
1. Min panel yapano =Isc*(1+(Max.temp-25)* kutentha kokwana(Isc)
2. Zingwe zochulukirachulukira=Zambiri. input current / Min panel panopa
3. Chitsanzo:
Curitiba, mzinda wa Brazil, kasitomala ali wokonzeka kukhazikitsa imodzi Renac Mphamvu 5KW magawo atatu inverter, ntchito dzuwa gulu chitsanzo ndi 330W gawo, osachepera pamwamba kutentha kwa mzindawo ndi -3 ℃ ndi kutentha pazipita ndi 35 ℃, lotseguka. voteji dera ndi 45.5V, Vmpp ndi 37.8V, inverter MPPT voteji osiyanasiyana 160V-950V, ndi voteji pazipita akhoza kupirira 1000V.
Inverter ndi deta:
Zolemba za solar panel:
A) Kukula kwa Voltage
Pakutentha kotsika kwambiri (kutengera malo, apa -3 ℃ ), voteji yotseguka V oc ya ma module mu chingwe chilichonse sayenera kupitilira mphamvu yayikulu ya inverter (1000 V):
1) Kuwerengera kwa Open Circuit Voltage pa -3 ℃:
VOC (-3℃) = 45.5*(1+(-3-25)*(-0.33%)) = 49.7 Volt
2) Kuwerengera N kuchuluka kwa ma module mu chingwe chilichonse:
N = Magetsi olowera kwambiri (1000 V)/49.7 Volt = 20.12 (nthawi zonse mozungulira)
Kuchuluka kwa mapanelo a solar PV mu chingwe chilichonse sayenera kupitilira ma module a 20 Kupatulapo, pakutentha kwambiri (malo amadalira, apa 35 ℃), voteji ya MPP VMPP ya chingwe chilichonse iyenera kukhala mkati mwamtundu wa MPP wa inverter yamagetsi adzuwa (160V- 950V):
3) Kuwerengera kwamphamvu kwambiri ya Mphamvu ya Voltage VMPP pa 35 ℃:
VMPP (35℃)=45.5*(1+(35-25)*(-0.33%))= 44 Volt
4) Kuwerengera kuchuluka kwa ma modules M mu chingwe chilichonse:
M = Min MPP voteji (160 V)/ 44 Volt = 3.64 (nthawi zonse mozungulira)
Chiwerengero cha mapanelo a solar PV mu chingwe chilichonse chiyenera kukhala ma modules 4.
B) Kukula Kwamakono
Kuzungulira kwakanthawi kochepa I SC ya gulu la PV sikuyenera kupitilira kuchuluka komwe kumaloledwa kulowetsa mphamvu ya solar power inverter:
1) Kuwerengera pazipita Panopo pa 35 ℃:
ISC (35℃)= ((1+ (10 * (TCSC /100))) * ISC ) = 9.22*(1+(35-25)*(-0.06%))= 9.16 A
2) Kuwerengera P kuchuluka kwa zingwe:
P = Kulowetsa kwakukulu komweku (12.5A)/9.16 A = 1.36 zingwe (zozungulira nthawi zonse)
Mndandanda wa PV suyenera kupitirira chingwe chimodzi.
Ndemanga:
Sitepe si chofunika kwa inverter MPPT ndi chingwe chimodzi chokha.
C) Mapeto:
1. Jenereta ya PV (PV array) imakhala ndichingwe chimodzi, yomwe imalumikizidwa ndi inverter itatu ya 5KW.
2. Mu chingwe chilichonse ma solar olumikizidwa ayenera kukhalamkati mwa 4-20 modules.
Ndemanga:
Popeza mpweya wabwino kwambiri wa MPPT wa magawo atatu a inverter uli pafupi ndi 630V (voltage yabwino kwambiri ya MPPT ya single phase inverter ili mozungulira 360V), mphamvu yogwira ntchito ya inverter ndiyokwera kwambiri panthawiyi. Chifukwa chake tikulimbikitsidwa kuwerengera kuchuluka kwa ma module a solar molingana ndi voteji yabwino kwambiri ya MPPT:
N = Best MPPT VOC / VOC (-3°C) = 756V/49.7V=15.21
Single crystal panel Best MPPT VOC =Best MPPT voteji x 1.2=630×1.2=756V
Polycrystal panel Yabwino kwambiri MPPT VOC = Mphamvu yabwino kwambiri ya MPPT x 1.2=630×1.3=819V
Chifukwa chake kwa Renac magawo atatu inverter R3-5K-DT mapanelo adzuwa omwe akulimbikitsidwa ndi ma module 16, ndipo amangofunika kulumikizidwa chingwe chimodzi 16x330W=5280W.
4. Mapeto
Inverter Inverter Nambala ya solar panel zimatengera kutentha kwa cell ndi kutentha kokwanira. Kuchita bwino kwambiri kumatengera mphamvu yabwino kwambiri ya MPPT ya inverter.