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A Simplified Control Method for Tie-Line Power of DC Micro-Grid

Author

Listed:
  • Yanbo Che

    (Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China)

  • Jinhuan Zhou

    (Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China)

  • Tingjun Lin

    (College of Energy and Electrical Engineering, Hohai University, Nanjing 210098, China)

  • Wenxun Li

    (Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China)

  • Jianmei Xu

    (Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China)

Abstract

Compared with the AC micro-grid, the DC micro-grid has low energy loss and no issues of frequency stability, which makes it more accessible for distributed energy. Thus, the DC micro-grid has good potential for development. A variety of renewable energy is included in the DC micro-grid, which is easily affected by the environment, causing fluctuation of the DC voltage. For grid-connected DC micro-grid with droop control strategy, the tie-line power is affected by fluctuations in the DC voltage, which sets higher requirements for coordinated control of the DC micro-grid. This paper presents a simplified control method to maintain a constant tie-line power that is suitable for the DC micro-grid with the droop control strategy. By coordinating the designs of the droop control characteristics of generators, energy storage units and grid-connected inverter, a dead band is introduced to the droop control to improve the system performance. The tie-line power in the steady state is constant. When a large disturbance occurs, the AC power grid can provide power support to the micro-grid in time. The simulation example verifies the effectiveness of the proposed control strategy.

Suggested Citation

  • Yanbo Che & Jinhuan Zhou & Tingjun Lin & Wenxun Li & Jianmei Xu, 2018. "A Simplified Control Method for Tie-Line Power of DC Micro-Grid," Energies, MDPI, vol. 11(4), pages 1-13, April.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:4:p:933-:d:141036
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    References listed on IDEAS

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    1. Dongmin Yu & Huanan Liu & Gangui Yan & Jing Jiang & Simon Le Blond, 2017. "Optimization of Hybrid Energy Storage Systems at the Building Level with Combined Heat and Power Generation," Energies, MDPI, vol. 10(5), pages 1-15, May.
    2. Planas, Estefanía & Andreu, Jon & Gárate, José Ignacio & Martínez de Alegría, Iñigo & Ibarra, Edorta, 2015. "AC and DC technology in microgrids: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 43(C), pages 726-749.
    3. Dongmin Yu & Yuanzhu Meng & Gangui Yan & Gang Mu & Dezhi Li & Simon Le Blond, 2017. "Sizing Combined Heat and Power Units and Domestic Building Energy Cost Optimisation," Energies, MDPI, vol. 10(6), pages 1-17, June.
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    Cited by:

    1. Carlos Roldán-Porta & Carlos Roldán-Blay & Guillermo Escrivá-Escrivá & Eduardo Quiles, 2019. "Improving the Sustainability of Self-Consumption with Cooperative DC Microgrids," Sustainability, MDPI, vol. 11(19), pages 1-22, October.

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