Title :
Analysis and design of distributed transformers for solar power conversion
Author :
Zhang, Kejiu ; Wu, Thomas ; Hu, Haibing ; Qian, Zhijun ; Chen, Frank ; Rustom, Khalid ; Kutkut, Nasser ; Shen, John ; Batarseh, Issa
Author_Institution :
Univ. of Central Florida, Orlando, FL, USA
Abstract :
In this paper, a high efficiency, low profile design of distributed transformers (DT) for grid-tied photovoltaic (PV) inverter is presented. The proposed DTs fully integrated into the dual-flyback converter maximize the DC/DC stage efficiency in whole load conditions. The developed DTs with the built-in current sensing transformer allows the converter works in boundary conduction mode (BCM) or discontinues conduction mode (DCM) due to the variable nature of solar power with zero current switching (ZCS). Analytical loss model is established to optimize the value of magnetizing inductance which determines the switching frequency and converter overall efficiency. Various techniques are also taken to minimize the winding loss of the DTs. The experimental prototype employing the DTs achieves over 96% efficiency at full load condition.
Keywords :
DC-DC power convertors; current transformers; photovoltaic power systems; power grids; power transformers; solar power stations; transformer windings; zero current switching; BCM; DC-DC stage efficiency; DCM; analytical loss model; boundary conduction mode; current sensing transformer; discontinues conduction mode; distributed transformer design; dual-flyback converter; efficiency 96 percent; grid-tied photovoltaic inverter; low profile design; solar power conversion; switching frequency; zero current switching; Converters; Ferrites; Inductance; Leg; Magnetic cores; Switching frequency; Windings;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2011 Twenty-Sixth Annual IEEE
Conference_Location :
Fort Worth, TX
Print_ISBN :
978-1-4244-8084-5
DOI :
10.1109/APEC.2011.5744823
