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PV String-Level Isolated DC–DC Power Optimizer with Wide Voltage Range

Author

Listed:
  • Hyungjin Kim

    (Department of Electrical & Information Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea)

  • Gibum Yu

    (Department of Electrical & Information Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea)

  • Jaehoon Kim

    (Department of Electrical & Information Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea)

  • Sewan Choi

    (Department of Electrical & Information Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea)

Abstract

This paper proposes a photovoltaic (PV) string-level isolated DC–DC power optimizer with wide voltage range. A hybrid control scheme in which pulse frequency modulation (PFM) control and pulse width modulation (PWM) control are combined with a variable switching frequency is employed to regulate the wide PV voltage range. By adjusting the switching frequency in the above region during the PWM control process, the circulating current period can be eliminated and the turn-on period of the bidirectional switch of the dual-bridge LLC (DBLLC) resonant converter is reduced compared to that with a conventional PWM control scheme with a fixed switching frequency, resulting in better switching and conduction loss. Soft start-up control under a no-load condition is proposed to charge the DC-link electrolytic capacitor from 0 V. A laboratory prototype of a 6.25 kW DBLLC resonant converter with a transformer, including integrated resonant inductance, is built and tested in order to verify the performance and theoretical claims.

Suggested Citation

  • Hyungjin Kim & Gibum Yu & Jaehoon Kim & Sewan Choi, 2021. "PV String-Level Isolated DC–DC Power Optimizer with Wide Voltage Range," Energies, MDPI, vol. 14(7), pages 1-18, March.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:7:p:1889-:d:526195
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    Cited by:

    1. Surender Reddy Salkuti, 2022. "Emerging and Advanced Green Energy Technologies for Sustainable and Resilient Future Grid," Energies, MDPI, vol. 15(18), pages 1-7, September.

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