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http://dx.doi.org/10.6113/JPE.2016.16.5.1629

Bidirectional Power Conversion of Isolated Switched-Capacitor Topology for Photovoltaic Differential Power Processors  

Kim, Hyun-Woo (Department of Electrical Engineering, Soongsil University)
Park, Joung-Hu (Department of Electrical Engineering, Soongsil University)
Jeon, Hee-Jong (Department of Electrical Engineering, Soongsil University)
Publication Information
Journal of Power Electronics / v.16, no.5, 2016 , pp. 1629-1638 More about this Journal
Abstract
Differential power processing (DPP) systems are among the most effective architectures for photovoltaic (PV) power systems because they are highly efficient as a result of their distributed local maximum power point tracking ability, which allows the fractional processing of the total generated power. However, DPP systems require a high-efficiency, high step-up/down bidirectional converter with broad operating ranges and galvanic isolation. This study proposes a single, magnetic, high-efficiency, high step-up/down bidirectional DC-DC converter. The proposed converter is composed of a bidirectional flyback and a bidirectional isolated switched-capacitor cell, which are competitively cheap. The output terminals of the flyback converter and switched-capacitor cell are connected in series to obtain the voltage step-up. In the reverse power flow, the converter reciprocally operates with high efficiency across a broad operating range because it uses hard switching instead of soft switching. The proposed topology achieves a genuine on-off interleaved energy transfer at the transformer core and windings, thus providing an excellent utilization ratio. The dynamic characteristics of the converter are analyzed for the controller design. Finally, a 240 W hardware prototype is constructed to demonstrate the operation of the bidirectional converter under a current feedback control loop. To improve the efficiency of a PV system, the maximum power point tracking method is applied to the proposed converter.
Keywords
Bidirectional converter; Differential power processor; Integrated inductor; Interleaved energy transfer;
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