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A New Control Strategy for Improving Weighted Efficiency in Photovoltaic AC Module-Type Interleaved Flyback Inverters

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5 Author(s)
Young-Ho Kim ; Sungkyunkwan Univ., Suwon, South Korea ; Young-Hyok Ji ; Jun-Gu Kim ; Yong-Chae Jung
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In this paper, a new control strategy for improving weighted efficiency in photovoltaic (PV) ac module-type interleaved flyback inverters (ILFIs) is proposed. The efficiency of the ILFI for PV ac modules has to be high, not only for the maximum power, but also for other power levels according to weather conditions. For PV power conversion efficiency improvement in all load ranges, a new control method for an ILFI according to the output of the PV module is proposed in this paper. The proposed method controls an active clamp circuit and each converter phase of an ILFI according to the output power of the PV module. Thus, the efficiency of an ILFI as a PV power conditioner can be improved in all power range of the PV module. Theoretical analysis, simulation, and experiment are performed in order to verify the proposed control method.

Published in:

Power Electronics, IEEE Transactions on  (Volume:28 ,  Issue: 6 )

Date of Publication:

June 2013

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