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Compact Single-Stage Micro-Inverter with Advanced Control Schemes for Photovoltaic Systems

Author

Listed:
  • Yoon-Geol Choi

    (Department of Electrical Engineering, Pohang University of Science and Technology, Pohang 37673, Korea)

  • Hyeon-Seok Lee

    (Department of Electrical Engineering, Pohang University of Science and Technology, Pohang 37673, Korea)

  • Bongkoo Kang

    (Department of Electrical Engineering, Pohang University of Science and Technology, Pohang 37673, Korea)

  • Su-Chang Lee

    (LG Electronics Co., Ltd., Energy Business Center, Gumi 39368, Korea)

  • Sang-Jin Yoon

    (Department of Electrical Engineering, Korea Polytechnics, Gumi 39257, Korea)

Abstract

This paper proposes a grid-connected single-stage micro-inverter with low cost, small size, and high efficiency to drive a 320 W class photovoltaic panel. This micro-inverter has a new and advanced topology that consists of an interleaved boost converter, a full-bridge converter, and a voltage doubler. Variable switching frequency and advanced burst control schemes were devised and implemented. A 320 W prototype micro-inverter was very compact and slim with 60-mm width, 310-mm length, and 30-mm height. In evaluations, the proposed micro-inverter achieved CEC weighted efficiency of 95.55%, MPPT efficiency >95% over the entire load range, and THD 2.65% at the rated power. The proposed micro-inverter is well suited for photovoltaic micro-inverter applications that require low cost, small size, high efficiency, and low noise.

Suggested Citation

  • Yoon-Geol Choi & Hyeon-Seok Lee & Bongkoo Kang & Su-Chang Lee & Sang-Jin Yoon, 2019. "Compact Single-Stage Micro-Inverter with Advanced Control Schemes for Photovoltaic Systems," Energies, MDPI, vol. 12(7), pages 1-15, March.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:7:p:1234-:d:218641
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    References listed on IDEAS

    as
    1. Seung-Woon Lee & Bo-Hyung Cho, 2016. "Master–Slave Based Hierarchical Control for a Small Power DC-Distributed Microgrid System with a Storage Device," Energies, MDPI, vol. 9(11), pages 1-14, October.
    2. Hae-Gwang Jeong & Gwang-Seob Kim & Kyo-Beum Lee, 2013. "Second-Order Harmonic Reduction Technique for Photovoltaic Power Conditioning Systems Using a Proportional-Resonant Controller," Energies, MDPI, vol. 6(1), pages 1-18, January.
    3. Liying Huang & Dongyuan Qiu & Fan Xie & Yanfeng Chen & Bo Zhang, 2017. "Modeling and Stability Analysis of a Single-Phase Two-Stage Grid-Connected Photovoltaic System," Energies, MDPI, vol. 10(12), pages 1-14, December.
    4. Hua Han & Chao Luo & Xiaochao Hou & Mei Su & Wenbin Yuan & Zhangjie Liu & Josep M. Guerrero, 2018. "A Cost-Effective Decentralized Control for AC-Stacked Photovoltaic Inverters," Energies, MDPI, vol. 11(9), pages 1-12, August.
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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.

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