Modelling, improvement and experimental validation of a 50 kHz-5 kVA litz-wired transformer for PV inverters

Author

Barrios, Ernesto L. ; Ursua, Alfredo ; Marroyo, Luis ; Sanchis, Pablo

Author_Institution

Dept. of Electr. & Electron. Eng., Public Univ. of Navarra (UPNa), Pamplona, Spain

fYear

2013

fDate

15-19 Sept. 2013

Firstpage

4364

Lastpage

4371

Abstract

Modelling of medium-frequency power transformers is analyzed and experimentally validated to characterize these devices along the operating power range. Special attention is paid to the core losses, winding losses and thermal modelling at operating conditions typical of power electronics applications. The performance of a commercial 50 kHz-5 kVA litz-wired transformer for PV resonant converters is characterized and tested by means of a specific measurement procedure. A complete model is selected from the estimated and measured results. Finally, this model is applied to improve the design of the commercial transformer previously analyzed in order to match typical PV requirements such as a high efficiency at different irradiation levels.

Keywords

cores; invertors; losses; photovoltaic power systems; power transformers; transformer windings; PV inverters; PV resonant converters; apparent power 5 kVA; commercial transformer; core losses; frequency 50 kHz; litz-wired transformer; measurement procedure; medium-frequency power transformers; power electronics applications; thermal modelling; typical PV requirements; winding losses; Conductors; Core loss; Loss measurement; Power transformers; Temperature measurement; Windings; Wires;

fLanguage

English

Publisher

ieee

Conference_Titel

Energy Conversion Congress and Exposition (ECCE), 2013 IEEE

Conference_Location

Denver, CO

Type

conf

DOI

10.1109/ECCE.2013.6647284

Filename

6647284