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PV Micro-Inverter Topology Using LLC Resonant Converter

Author

Listed:
  • Hiroki Watanabe

    (Department of Electrical, Electronics and Information Engineering, Nagaoka University of Technology, Kamitomiokamachi, Nagaoka, Niigata 940-2137, Japan)

  • Jun-ichi Itoh

    (Department of Electrical, Electronics and Information Engineering, Nagaoka University of Technology, Kamitomiokamachi, Nagaoka, Niigata 940-2137, Japan)

  • Naoki Koike

    (Pony Electric Co., Ltd., Kitasaiwai, Yokohama, Kanagawa 220-0004, Japan)

  • Shinichiro Nagai

    (Pony Electric Co., Ltd., Kitasaiwai, Yokohama, Kanagawa 220-0004, Japan)

Abstract

In this paper, a DC–single-phase AC power converter with an LLC resonant converter is presented for a photovoltaic (PV) micro-inverter application. This application requires the leakage current suppression capability. Therefore, an isolated power converter is usually combined for DC/AC systems. The LLC resonant converter is the one of the isolated power converter topologies, and it has good performance for conversion efficiency with easy control. On the other hand, a double-line frequency power ripple has to be compensated for in order to improve the performance of the maximum power point tracking (MPPT). Therefore, a bulky electrolytic capacitor is usually necessary for the power converter. However, the electrolytic capacitor may limit the lifetime of the micro-inverter. This paper introduces the PV micro-inverter with a LLC resonant converter. In addition, the active power decoupling circuit is applied in order to compensate the double-line frequency power ripple by the small capacitor in order to eliminate the electrolytic capacitor. Finally, the transformer design is considered in order to reduce the transformer losses. As a result, the conversion efficiency of the LLC converter is improved by 1% when the litz wire has many strands.

Suggested Citation

  • Hiroki Watanabe & Jun-ichi Itoh & Naoki Koike & Shinichiro Nagai, 2019. "PV Micro-Inverter Topology Using LLC Resonant Converter," Energies, MDPI, vol. 12(16), pages 1-11, August.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:16:p:3106-:d:257154
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    Citations

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    Cited by:

    1. Luis A. M. Barros & Mohamed Tanta & Tiago J. C. Sousa & Joao L. Afonso & J. G. Pinto, 2020. "New Multifunctional Isolated Microinverter with Integrated Energy Storage System for PV Applications," Energies, MDPI, vol. 13(15), pages 1-26, August.
    2. Noor Afeefah Nordin & Mohamed Nainar Mohamed Ansari & Saifuddin M. Nomanbhay & Nasri A. Hamid & Nadia M. L. Tan & Zainudin Yahya & Izhan Abdullah, 2021. "Integrating Photovoltaic (PV) Solar Cells and Supercapacitors for Sustainable Energy Devices: A Review," Energies, MDPI, vol. 14(21), pages 1-20, November.
    3. Lei Hou & Dezhi Chen & Tongfei Li & Ming Zhao & Huaibo Ren, 2022. "Design and Research on DC Electric Leakage Protection Circuit Breaker," Energies, MDPI, vol. 15(15), pages 1-16, August.
    4. Hwa-Pyeong Park & Mina Kim & Jee-Hoon Jung, 2020. "A Comprehensive Overview in Control Algorithms for High Switching-Frequency LLC Resonant Converter," Energies, MDPI, vol. 13(17), pages 1-17, August.

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