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Photovoltaic Generation by Parallel Driving of Modified Buck-boost Converter  

Lee Hee-Chang (부산대 기계기술연구소)
Park Sung-Jun (전남대 전기공학과)
Park Soo-Sik ((주)이안테크놀로지)
Moon Chae-Joo (목포대 전기공학과)
Lee Man-Hyung (부산대 공대 기계공학부)
Kim Jong-Dal (동명대학)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.9, no.5, 2004 , pp. 457-466 More about this Journal
Abstract
In this paper, a modified converter is presented and analyzed to use as a photovoltaic converter. And also a new parallel driving scheme is proposed to increase output power and to reduce the output voltage ripple. The ratio of the output to the input voltage of the modified converter is equal to that of the boost converter. The difference between both converters is the composition of output terminal. Owing to the discrepancy, a working voltage of the output capacitor of the modified converter becomes lower, thus the capacitance value of the capacitor can be smaller than that of the boost converter. The proposed parallel driving is based on the modified converter and a current-mode-control method. It gives a good solution for alleviating the current sharing unbalance problem of conventional parallel operations. It reduces the output voltage ripple by means of increasing the equivalent switching frequency without additional switching losses. The validity of the proposed parallel driving strategy is verified through computer-aided simulations and experimental results.
Keywords
Photovoltaic systems; modified buck-boost converter; parallel driving;
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