Associate Professor Eng. Roberto FARANDA, PhD (Italia), Professor Eng. Nicolae GOLOVANOV, PhD, Lecturer Eng. George-Cristian LAZAROIU, PhD, Associate Professor Eng. Sonia LEVA, PhD (Italia).
Rezumat
Managementul termic si determinarea frecventei de comutatie maxima admisibila sunt doua probleme
importante in functionarea invertoarelor panourilor folotoelectrice (PV). Lucrarea analizeaza modelarea termica a
invertoarelor folosind modele analitice ale dispozivelor, dependente de temperatura. Fenomenul termic este studiat
folosind circuite RC. Este analizata o metoda de racire pasiva a invertoarelor. Eficienta invertorului scade odata cu variatia
temperaturii. Temperatura de functionare in prezenta lichidului de racire permite reducerea scaderii eficientei.
Cuvinte cheie: modelare convertormodel termicPVsistem de racire
Abstract
The thermal management and determination of maximum allowable switching frequency are two important
challenges in operating PV converters. The paper deals with the thermal modelling of inverters based on temperaturedependent
analytical device models. The thermal phenomenon is studied with equivalent RC circuits. A passive cooling
solution for PV power converters is considered. The efficiency of the converter reduces with the temperature variation. The
lower operating temperature reached by the liquid cooled inverter allows to strongly reduce the efficiency decrease
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