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

Hyun-Woo Kim; Joung-Hu Park; Hee-Jong Jeon

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

Hyun-Woo Kim

Joung-Hu Park

Hee-Jong Jeon

Vol. 16, No. 5, pp. 1629-1638, Sep. 2016

10.6113/JPE.2016.16.5.1629

Bidirectional converter

Differential power processor

Integrated inductor

Interleaved energy transfer

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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, highefficiency, 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.

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Cite this article

[IEEE Style]

H. Kim, J. Park, H. Jeon, "Bidirectional Power Conversion of Isolated Switched-Capacitor Topology for Photovoltaic Differential Power Processors," Journal of Power Electronics, vol. 16, no. 5, pp. 1629-1638, 2016. DOI: 10.6113/JPE.2016.16.5.1629.

[ACM Style]

Hyun-Woo Kim, Joung-Hu Park, and Hee-Jong Jeon. 2016. Bidirectional Power Conversion of Isolated Switched-Capacitor Topology for Photovoltaic Differential Power Processors. Journal of Power Electronics, 16, 5, (2016), 1629-1638. DOI: 10.6113/JPE.2016.16.5.1629.