Kuhlelo lwe-photovoltaic (PV), ugesi okhiqizwayo usetshenziswa kakhulu ekunikezeni amandla imithwalo. Lapho ukukhiqizwa kudlula isidingo somthwalo, ugesi owedlulele ubuyela emuva kugridi, okudala "ugesi obuyela emuva." Imithethonqubo yegridi ivame ukuvimbela ukugeleza emuva okungavunyelwe, futhi ukuphakelwa kwamandla okungagunyaziwe kungabangela izinhlawulo. Kumaphrojekthi e-PV aklanyelwe ukuzisebenzisa ngaphandle kokuphakelwa kwegridi, ukuvikelwa kokungabuyeli emuva kubalulekile ekufinyeleleni ukuzimela kwamandla okusimeme.
Kuyini Ukulwa Nokubuyela Emuva?
Kuhlelo lwe-PV, amamojula elanga akhiqiza ugesi oqondile (DC), oguqulwa ube ugesi oshintshashintshayo (AC) yi-inverter ukuze unikeze imithwalo yendawo. Uma ugesi udlula ukusetshenziswa, ugesi owengeziwe ubuyela emuva kugridi, okudala ukugeleza emuva. Izinhlelo ezinomsebenzi wokulwa nokugeleza emuva zingalungisa ukuphuma kwe-inverter ukuqinisekisa ukuthi ugesi okhiqizwayo usetshenziswa ngokugcwele yimithwalo yendawo, ukuvimbela amandla amaningi ukuthi angangeni kugridi.
Kungani Ufaka i-Anti-Backflow?
Izizathu eziyinhloko zokufaka i-anti-backflow zifaka:
1. Imikhawulo Yenqubomgomo Yegridi:Kwezinye izifunda, imikhawulo noma izinqubomgomo zegridi ziyakwenqabela ukufaka ugesi kugridi. Ukugeleza kwamandla okungagunyaziwe kungaholela ezijezisweni.
2. Imikhawulo Yokuxhumeka Kwegridi:Igridi ibeka imingcele eqinile enanini lamandla angafakwa kuyo. Ukudlula le mingcele ngaphandle kokulawula kungaphazamisa ukuzinza kwegridi.
3. Isimiso Sokuzidla:Izinhlelo ze-PV ezenzelwe ukuzisebenzisela zona zibeka phambili ukusetshenziswa komthwalo wendawo. Noma imaphi amandla angaphezulu kumele avinjelwe ukungena kugridi kusetshenziswa amadivayisi alwa nokugeleza komoya emuva.
Isimiso Sokusebenza Sokulwa Nokubuyela Emuva
Izinhlelo zokulwa nokugeleza emuva zivame ukufaka imitha yokugeleza emuva kanye ne-transformer yamanje (CT) efakwe ku-mainline. Lezi zingxenye zilinganisa amandla esikhathi sangempela kanye nokugeleza kwamanje. Uma kutholakala ugesi obuyela emuva, imitha idlulisela idatha yokugeleza emuva ku-inverter ngokuxhumana kwe-RS485. I-inverter iphendula ngemizuzwana, inciphise amandla ayo okukhipha ukuqinisekisa ukuthi ukugeleza kwamanje kugridi cishe ku-zero.
Izixazululo Zokulwa Nokubuyela Emuva
Kunezindlela ezahlukene zokulungiselela ezitholakalayo ukuze kuhlangatshezwane nezimo ezahlukene:
1. Isixazululo Sesistimu Yokulwa Nokubuyela Emuva Kwesigaba Esisodwa
· Imishini edingekayo: i-inverter eboshwe ngegridi, imitha yokuvimbela ukugeleza kwamanzi emuva, kanye nekhebula lokuxhumana.
· Ifanele izinhlelo ze-PV zokuhlala ezincane.
2. Isixazululo Sesistimu Elwa Nokubuyela Emuva Esinezigaba Ezintathu
· Kumasistimu okuhlala anamandla aphansi, amamitha e-DC alwa nokugeleza emuva angaxhunywa ngqo kuma-terminals e-AC okukhiphayo e-inverter.
· Kumasistimu anamandla amakhulu, ama-CT transformer abona ugesi endaweni yokuxhuma yegridi. Umphumela we-CT uyalinganiswa bese ufakwa kumitha yokugeleza komoya ukuze kulinganiswe amandla ngendlela enembile.
3. Isixazululo Sesistimu Yokulwa Nokubuyela Emuva Kwe-Multi-Inverter
· Ama-inverter amaningi axhunywe ngezixhumanisi zokuxhumana ku-data logger.
· Lesi sixazululo silungele ukusethwa okukhulu, sinikeza amandla aphezulu kanye nokusebenza okuqinile.
Isifinyezo
Izixazululo ezilwa nokugeleza emuva zibhekana nezidingo zenqubomgomo "ezixhunywe kugridi kodwa ezingangenisi" zezifunda ezithile. Zithuthukisa ukuzinza kwegridi, zithuthukisa ukuphepha kohlelo, zithuthukise ukusebenza kahle kwamandla, futhi zivumelanisa nobuchwepheshe nezinqubomgomo ezishintshayo. Ngokusebenzisa izinhlelo eziklanyelwe ukulwa nokugeleza emuva, amaphrojekthi e-PV angaqinisekisa ukuhambisana, ukuthembeka, kanye nokusebenza kahle kwezomnotho.
