Energija, ekonomija, ekologija, 4, XXVII (2025) (39-50 стр.)
АУТОР(И) / AUTHOR(S):Željko V. Despotović 
Miodrag Vuković Marko Tajdić
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DOI: https://doi.org/10.46793/EEE25-4.39D
САЖЕТАК / ABSTRACT:
Trofazni fotonaponski mrežni invertori sa tri naponska nivoa sa fiksiranom neutralnom tačkom („three level neutral point clamped“-3LNPC) su postali veoma interesantni za fotonaponske sisteme velikih snaga sa aspekta kvaliteta izlaznog napona i smanjenja harmonika koji se injektiraju u elektroenergetsku mrežu. Ovaj tip invertora pokazuje niz prednosti u odnosu na klasične trofazne invertore sa dva nivoa. Jedan od bitnih aspekata pouzdanog i sigurnog rada mrežnog fotonaponskog invertora su tipovi izolacije koji su primenjeni u njemu. Kada se govori o izolaciji, misli se na izolaciju između energetskih sklopova invertora i mrežnog napajanja sa jedne strane, i izolaciju između upravljačkih i komunikacionih elektronskih sklopova i energetskih modula invertora sa druge strane. U radu je dat jedan primer analize i koordinacije izolacije mrežnog fotonaponskog invertora sa tri naponska nivoa sa fiksiranom neutralnom tačkom baziran na standardu EN62109-1. Ulazni DC napon analiziranog fotonaponskog invertora je ≤1500 V, 50Hz, mrežni napon 3×400 V, 50Hz, sistem zaštite od previsokog napona dodira TN-C, a sam fotonaponski invertor je na mrežu vezan preko trofaznog energetskog transformatora prenosnog odnosa 2:1 (800 Vac/400 Vac).
КЉУЧНЕ РЕЧИ / KEYWORDS:
Fotonaponski sistemi, 3L NPC PV invertor, koordinacija izolacije, mrežno napajanje, galvanska izolacija, TN-C sistem zaštite
ПРОЈЕКАТ / ACKNOWLEDGEMENT:
Rad je nastao u okviru istraživanja koja su finansirana od strane Ministarstva nauke, tehnološkog razvoja i inovacija, za period 2024.-2025., Ugovor pod evidencionim brojem 51-03-136/2025-03/200034 od 04.02.2025.
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