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A Decentralized Control Strategy for Series-Connected Single-Phase Two-Stage Photovoltaic Grid-Connected Inverters

Author

Listed:
  • Zhaoxu Luo

    (School of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China)

  • Bo Zhang

    (School of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China)

  • Lang Li

    (Department of Automation, Moutai Institute, Renhuai 564507, China)

  • Lixing Tang

    (School of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China)

Abstract

Currently, most of the series inverter control methods rely on communication, which greatly reduces the reliability of the system and increases the cost. To address the above problems, this paper proposes a decentralized control strategy for series-connected single-phase two-stage grid-connected photovoltaic (PV) inverters. By improving the traditional droop control, the frequency and phase of the output voltage of each inverter unit are consistent and self-synchronized with the power grid while relying only on local independent control, and each unit realizes maximum power point tracking (MPPT). At different light intensities, each series-connected unit can quickly track the new maximum power point while still maintaining self-synchronization between the units. The system stability is analyzed via the small signal method, and sufficient conditions for system stability are obtained. Finally, the simulation results verify the correctness and effectiveness of the proposed control strategy.

Suggested Citation

  • Zhaoxu Luo & Bo Zhang & Lang Li & Lixing Tang, 2023. "A Decentralized Control Strategy for Series-Connected Single-Phase Two-Stage Photovoltaic Grid-Connected Inverters," Energies, MDPI, vol. 16(20), pages 1-13, October.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:20:p:7099-:d:1260062
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    References listed on IDEAS

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    1. Calais, Martina & Agelidis, Vassilios G & Dymond, Michael S, 2001. "A cascaded inverter for transformerless single-phase grid-connected photovoltaic systems," Renewable Energy, Elsevier, vol. 22(1), pages 255-262.
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    Cited by:

    1. Hosik Lee & Yonghun Kim & Seok-Kyoon Kim, 2024. "Current Sensorless Pole-Zero Cancellation Output Voltage Control for Uninterruptible Power Supply Systems with a Three-Phase Inverter," Energies, MDPI, vol. 17(7), pages 1-18, April.

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