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International Journal of Photoenergy
Volume 2012, Article ID 838231, 11 pages
http://dx.doi.org/10.1155/2012/838231
Research Article

PV Power-Generation System with a Phase-Shift PWM Technique for High Step-Up Voltage Applications

Department of Electrical Engineering, National Chin-Yi University of Technology, Taichung 411, Taiwan

Received 14 February 2012; Accepted 20 June 2012

Academic Editor: F. Yakuphanoglu

Copyright © 2012 Cheng-Tao Tsai and Sin-Hua Chen. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A PV power-generation system with a phase-shift pulse-width modulation (PWM) technique for high step-up voltage applications is proposed. The proposed power-generation system consists of two stages. In the input stage, all power switches of the full-bridge converter with phase-shift technique can be operated with zero-current switching (ZCS) at turn-on or turn-off transition. Hence, the switching losses of the power switches can be reduced. Then, in the DC output stage, a voltage-doubler circuit is used to boost a high dc-link bus voltage. To supply a utility power, a dc/ac inverter is connected to induce a sinusoidal source. In order to draw a maximum power from PV arrays source, a microcontroller is incorporated with the perturbation and observation method to implement maximum power point tracking (MPPT) algorithm and power regulating scheme. In this study, a full load power of 300 W prototype has been built. Experimental results are presented to verify the performance and feasibility of the proposed PV power-generation system.