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Coordinated Control Strategy of a Combined Converter in a Photovoltaic DC Boost Collection System under Partial Shading Conditions

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  • Ke Guo

    (School of Electrical Engineering, Chongqing University, Chongqing 400044, China
    State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China)

  • Qiang Liu

    (School of Electrical Engineering, Chongqing University, Chongqing 400044, China)

  • Xinze Xi

    (School of Electrical Engineering, Chongqing University, Chongqing 400044, China
    Electric Power Research Institute of Yunnan Power Grid Co. Ltd., Kunming 650217, China)

  • Mingxuan Mao

    (School of Electrical Engineering, Chongqing University, Chongqing 400044, China
    State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China)

  • Yihao Wan

    (School of Electrical Engineering, Chongqing University, Chongqing 400044, China)

  • Hao Wu

    (School of Electrical Engineering, Chongqing University, Chongqing 400044, China)

Abstract

Series–parallel module technology can meet a DC converter’s requirements of high-power, large-capacity, and high step-up ratio in photovoltaic a DC boost collection system. However, the cascaded structure has the problem of voltage and current sharing between modules, and due to the duty cycle limitation of converters, the combined converters in the PV-converter unit have an unbalanced voltage, which may also exceed the voltage range under partial shading conditions (PSCs). First, aiming at the problems of voltage sharing, current sharing, and low modularity in the combined converter, this paper proposes a distributed control strategy. Then, by adopting a coordinated control strategy based on the sub-module cutting in and out, the problem that the combined converter cannot normally boost under PSCs was solved. The paper not only takes the advantages of the cascade structure of the combined converter to increase the power and voltage, but also improves its modularity to solve the problem of abnormal operation under uneven irradiation. This dramatically improves the adaptability of combined converters in a photovoltaic DC collection system. Finally, a small power experiment was carried out, where the experimental results verified the effectiveness of the control strategy.

Suggested Citation

  • Ke Guo & Qiang Liu & Xinze Xi & Mingxuan Mao & Yihao Wan & Hao Wu, 2020. "Coordinated Control Strategy of a Combined Converter in a Photovoltaic DC Boost Collection System under Partial Shading Conditions," Energies, MDPI, vol. 13(2), pages 1-18, January.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:2:p:474-:d:310332
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    References listed on IDEAS

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    2. Nouha Mansouri & Abderezak Lashab & Dezso Sera & Josep M. Guerrero & Adnen Cherif, 2019. "Large Photovoltaic Power Plants Integration: A Review of Challenges and Solutions," Energies, MDPI, vol. 12(19), pages 1-16, October.
    3. Teuvo Suntio & Tuomas Messo & Aapo Aapro & Jyri Kivimäki & Alon Kuperman, 2017. "Review of PV Generator as an Input Source for Power Electronic Converters," Energies, MDPI, vol. 10(8), pages 1-25, July.
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    Cited by:

    1. Rongchao Niu & Hongyu Zhang & Jian Song, 2023. "Model Predictive Control of DC–DC Boost Converter Based on Generalized Proportional Integral Observer," Energies, MDPI, vol. 16(3), pages 1-16, January.
    2. Bader N. Alajmi & Mostafa I. Marei & Ibrahim Abdelsalam & Mohamed F. AlHajri, 2021. "Analysis and Design of a Multi-Port DC-DC Converter for Interfacing PV Systems," Energies, MDPI, vol. 14(7), pages 1-17, April.

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