Kwinkqubo ye-photovoltaic (PV), umbane oveliswayo usetyenziselwa ikakhulu ukukhulisa imithwalo. Xa ukuveliswa kudlula imfuno yomthwalo, umbane ogqithisileyo ubuyela kwigridi, nto leyo edala "umbane obuyela umva." Imithetho yegridi idla ngokuthintela ukubuya kombane okungavumelekanga, kwaye ukondla umbane okungagunyaziswanga kunokubangela izohlwayo. Kwiiprojekthi ze-PV ezenzelwe ukuzisebenzisa ngaphandle kokondla umbane, ukhuseleko lokulwa nokubuyela umva lubalulekile ekufezekiseni ukuzimela kwamandla okuzinzileyo.
Yintoni i-Anti-Backflow?
Kwinkqubo ye-PV, iimodyuli zelanga zivelisa umsinga othe ngqo (DC), oguqulwa ube ngumsinga otshintshanayo (AC) yi-inverter ukuze unikezele ngemithwalo yendawo. Ukuba ukuveliswa kudlula ukusetyenziswa, umbane ongaphezulu ubuyela kwigridi, nto leyo edala ukubuya kombane. Iinkqubo ezisebenza ngokulwa nokubuyela umva zinokulungisa imveliso ye-inverter ukuqinisekisa ukuba umbane oveliswayo usetyenziswa ngokupheleleyo yimithwalo yendawo, ukuthintela amandla agqithisileyo ukuba angangeni kwigridi.
Kutheni Ufakela i-Anti-Backflow?
Izizathu eziphambili zokufaka i-anti-backflow ziquka:
1. Imida yoMgaqo-nkqubo weGridi:Kwezinye iindawo, imiqathango okanye imigaqo-nkqubo yegridi iyakwalela ukufaka umbane kwigridi. Ukubuyela umva okungagunyaziswanga kunokukhokelela kwizohlwayo.
2. Imida yoQhagamshelo lweGridi:Igridi ibeka imida engqongqo kubungakanani bamandla anokufakwa kuyo. Ukudlula le mida ngaphandle kolawulo kunokuphazamisa uzinzo lwegridi.
3. Umgaqo Wokuzisebenzisa:Iinkqubo ze-PV ezenzelwe ukuzisebenzisa zibeka phambili ukusetyenziswa komthwalo kwindawo ethile. Naliphi na amandla agqithisileyo kufuneka avalwe ukuba angangeni kwigridi kusetyenziswa izixhobo ezichasene nokuhamba kwamanzi.
Umgaqo-nkqubo Wokusebenza Wokulwa Nokubuyela Umva
Iinkqubo ze-anti-backflow zihlala ziquka i-anti-backflow meter kunye ne-current transformer (CT) efakwe kumgca oyintloko. Ezi zixhobo zilinganisa amandla exesha langempela kunye nokuhamba kwamandla e-current. Xa umbane obuyela umva ufunyenwe, i-meter idlulisela idatha yokuhamba kwamandla e-backflow kwi-inverter ngonxibelelwano lwe-RS485. I-inverter iphendula kwimizuzwana embalwa, inciphisa amandla ayo okukhupha ukuqinisekisa ukuba ukuhamba kwamandla e-current kwi-grid kuphantse kube zero.
Izisombululo zokungabuyeli emva kokuhamba
Kukho iindlela ezahlukeneyo zokulungiselela ukuhlangabezana neemeko ezahlukeneyo:
1. Isisombululo seNkqubo yokuLwa nokuBuya kweMigca esiSigaba esinye
· Izixhobo ezifunekayo: i-inverter ebotshelelwe kwigridi, imitha yokulinganisa ukuhamba kwamanzi, kunye nentambo yonxibelelwano.
· Ifanelekile kwiinkqubo ze-PV zokuhlala ezincinci.
2. Isisombululo seNkqubo yokuLwa nokuBuya kweMigca esiPhakathi esiThathu
· Kwiinkqubo zokuhlala ezisebenzisa amandla aphantsi, iimitha ze-DC ezichasene nokubuyela umva zinokuqhagamshelwa ngokuthe ngqo kwiiterminal ze-AC zokukhupha ze-inverter.
· Kwiinkqubo zamandla aphezulu, ii-CT transformers zibona umsinga kwindawo yoqhagamshelo lwegridi. Isiphumo se-CT siyalinganiswa size sifakwe kwimitha echasene nokubuyela umva ukuze kulinganiswe amandla ngokuchanekileyo.
3. Isisombululo seNkqubo ye-Multi-Inverter Anti-Backflow
· Ii-inverters ezininzi ziqhagamshelwe kwi-data logger nge-interfaces zonxibelelwano.
· Esi sisombululo sifanelekile kwiisetingi ezinkulu, sinika amandla aphezulu kunye nokusebenza okuqinileyo.
Isishwankathelo
Izisombululo ezichasene nokuphuma kwamanzi zijongana neemfuno zomgaqo-nkqubo "oqhagamshelwe kwigridi kodwa ezingangeniyo" kwimimandla ethile. Ziyandisa uzinzo lwegridi, ziphucula ukhuseleko lwenkqubo, ziphucule ukusebenza kakuhle kwamandla, kwaye zilungelelanisa nobuchwepheshe kunye nemigaqo-nkqubo eguqukayo. Ngokusebenzisa iinkqubo ezichasene nokuphuma kwamanzi ezilungiselelwe wena, iiprojekthi ze-PV zinokuqinisekisa ukuthotyelwa, ukuthembeka, kunye nokuphila kakuhle kwezoqoqosho.
