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Novel Three-Port Bidirectional DC/DC Converter with Three-Winding Coupled Inductor for Photovoltaic System

Author

Listed:
  • Yu-En Wu

    (Department of Electronic Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 824, Taiwan)

  • Kai-Cheng Hsu

    (Department of Electronic Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 824, Taiwan)

Abstract

This study proposes a novel three-port bidirectional converter with a three-winding coupled inductor and applies it to a photovoltaic (PV) system to step up the PV system output to a dc bus or dc load while charging the battery. When the PV output is insufficient, battery voltage is stepped up to the dc bus voltage, and when the dc bus has excess energy, it is stepped down to charge the battery. Thus, a three-port bidirectional high step-up/step-down converter is achieved. A three-winding common core coupled inductor is designed and implemented in the converter, and a full-wave doubler circuit is used on the high-voltage side to achieve a high step-up effect. Power switches and diodes in the circuit are shared to achieve bidirectional operation. The output capacitors recover secondary-side leakage inductance energy in the step-up mode, and the third winding can be used to recover primary-side leakage inductance energy to reduce the voltage spike on switching in order to improve the converter’s conversion efficiency. A 500-W three-port bidirectional converter is implemented to verify the feasibility and practicability of the proposed topology. According to the measurement results, the highest efficiency of the PV step-up mode is 95.3%, the highest efficiency of the battery step-up mode is 94.1%, and the highest efficiency of the step-down mode is 94.8%.

Suggested Citation

  • Yu-En Wu & Kai-Cheng Hsu, 2020. "Novel Three-Port Bidirectional DC/DC Converter with Three-Winding Coupled Inductor for Photovoltaic System," Energies, MDPI, vol. 13(5), pages 1-25, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:5:p:1132-:d:327751
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    Cited by:

    1. Yu-En Wu, 2022. "Novel High-Step-Up/Step-Down Three-Port Bidirectional DC/DC Converter for Photovoltaic Systems," Energies, MDPI, vol. 15(14), pages 1-20, July.
    2. Binxin Zhu & Hui Hu & Hui Wang & Yang Li, 2020. "A Multi-Input-Port Bidirectional DC/DC Converter for DC Microgrid Energy Storage System Applications," Energies, MDPI, vol. 13(11), pages 1-16, June.

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