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International Journal of Photoenergy
Volume 2012, Article ID 381016, 12 pages
Research Article

Modified Grid-Connected CSI for Hybrid PV/Wind Power Generation System

1Department of Electrical Engineering, Chiangmai University, Suthep, Muang, Chiangmai 50200, Thailand
2Department of Electronics Engineering, University of Electro-Communications, 1-5-1 Chofugaoaka, Chofu, Tokyo 182-8585, Japan
3Laboratoire Plasma et Conversion d’Energie (LAPLACE), Institut National Polytechnique de Toulouse, 31071 Toulouse, France

Received 8 April 2012; Revised 15 August 2012; Accepted 24 August 2012

Academic Editor: Christophe Menezo

Copyright © 2012 D. Amorndechaphon et al. 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.


The principle of a power conditioning unit for hybrid PV/wind power generation system is proposed. The proposed power conditioner is based on the current source inverter (CSI) topology. All energy sources are connected in parallel with a DC-bus through the modified wave-shaping circuits. To achieve the unity power factor at the utility grid, the DC-link current can be controlled via the wave-shaping circuits with the sinusoidal PWM scheme. In this work, the carrier-based PWM scheme is also proposed to minimize the utility current THD. The power rating of the proposed system can be increased by connecting more PV/wind modules through their wave-shaping circuits in parallel with the other modules. The details of the operating principles, the system configurations, and the design considerations are described. The effectiveness of the proposed CSI is demonstrated by simulation results.