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Coordinated Control of Distributed Energy Storage Systems for DC Microgrids Coupling Photovoltaics and Batteries

Author

Listed:
  • Quan’e Zhang

    (Longnan Power Supply Company of State Grid Gansu Electric Power Company, Longnan 746000, China)

  • Zhigang Song

    (Longnan Power Supply Company of State Grid Gansu Electric Power Company, Longnan 746000, China)

  • Qiushi Ru

    (Longnan Power Supply Company of State Grid Gansu Electric Power Company, Longnan 746000, China)

  • Jiangwei Fan

    (School of New Energy and Power Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China)

  • Lihui Qiao

    (School of New Energy and Power Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China)

  • Mingche Li

    (School of New Energy and Power Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China)

  • Licheng Wang

    (School of Information Engineering, Zhejiang University of Technology, Hangzhou 310014, China)

  • Shuaibing Li

    (School of New Energy and Power Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China)

Abstract

To adapt to frequent charge and discharge and improve the accuracy in the DC microgrid with independent photovoltaics and distributed energy storage systems, an energy-coordinated control strategy based on increased droop control is proposed in this paper. The overall power supply quality of the DC microgrid is improved by optimizing the output priority of the multi-energy storage system. When photovoltaic and energy storage work simultaneously, the proposed method can dynamically adjust their working state and the energy storage unit’s droop coefficient to meet the system’s requirements. In DC microgrids with energy storage units of different capacities, the proposed strategy can be used to maintain the stability of bus voltage, improve the equalization speed and accuracy of the energy storage state of charge, and avoid the shutdown of energy storage units due to overcharge or discharge. Verification of the proposed strategy is implemented with MATLAB/Simulink. The simulation results show the proposed control strategy’s effectiveness in balancing energy supply and demand and reducing the time of charging and discharging energy storage units.

Suggested Citation

  • Quan’e Zhang & Zhigang Song & Qiushi Ru & Jiangwei Fan & Lihui Qiao & Mingche Li & Licheng Wang & Shuaibing Li, 2023. "Coordinated Control of Distributed Energy Storage Systems for DC Microgrids Coupling Photovoltaics and Batteries," Energies, MDPI, vol. 16(2), pages 1-14, January.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:2:p:665-:d:1026613
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    References listed on IDEAS

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    1. Xingmin Li & Hongwei Li & Shuaibing Li & Ziwei Jiang & Xiping Ma, 2021. "Review on Reactive Power and Voltage Optimization of Active Distribution Network with Renewable Distributed Generation and Time-Varying Loads," Mathematical Problems in Engineering, Hindawi, vol. 2021, pages 1-18, November.
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