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A Coordinated Control for Photovoltaic Generators and Energy Storages in Low-Voltage AC/DC Hybrid Microgrids under Islanded Mode

Author

Listed:
  • Yao Liu

    (Zhuhai Power Supply Bureau of Guangdong Power Grid Corporation, Zhuhai 519000, China)

  • Xiaochao Hou

    (School of Information Science and Engineering, Central South University, Changsha 410083, China)

  • Xiaofeng Wang

    (Zhuhai Power Supply Bureau of Guangdong Power Grid Corporation, Zhuhai 519000, China)

  • Chao Lin

    (Zhuhai Power Supply Bureau of Guangdong Power Grid Corporation, Zhuhai 519000, China)

  • Josep M. Guerrero

    (Department of Energy Technology, Aalborg University, Aalborg East DK-9220, Denmark)

Abstract

The increasing penetration of renewable generators can be a significant challenge due to the fluctuation of their power generation. Energy storage (ES) units are one solution to improve power supply quality and guarantee system stability. In this paper, a hybrid microgrid is built based on photovoltaic (PV) generator and ES; and coordinated control is proposed and developed to achieve power management in a decentralized manner. This control scheme contains three different droop strategies according to characteristics of PV and ES. First, the modified droop control is proposed for PV, which can take full utilization of renewable energy and avoid regulating output active power frequently. Second, to maintain the direct current (DC) bus voltage stability, a novel droop control incorporating a constant power band is presented for DC-side ES. Third, a cascade droop control is designed for alternating current (AC)-side ES. Thus, the ES lifetime is prolonged. Moreover, interlinking converters (ICs) provide a bridge between AC/DC buses in a hybrid microgrid. The power control of IC is enabled when the AC- or DC-side suffer from active power demand shortage. In particular, if the AC microgrid does not satisfy the reactive power demand, IC then acts as a static synchronous compensator (STATCOM). The effectiveness of the proposed strategies is verified by simulations.

Suggested Citation

  • Yao Liu & Xiaochao Hou & Xiaofeng Wang & Chao Lin & Josep M. Guerrero, 2016. "A Coordinated Control for Photovoltaic Generators and Energy Storages in Low-Voltage AC/DC Hybrid Microgrids under Islanded Mode," Energies, MDPI, vol. 9(8), pages 1-15, August.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:8:p:651-:d:76142
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    References listed on IDEAS

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    6. Wei Gu & Wei Liu & Zhi Wu & Bo Zhao & Wu Chen, 2013. "Cooperative Control to Enhance the Frequency Stability of Islanded Microgrids with DFIG-SMES," Energies, MDPI, vol. 6(8), pages 1-21, August.
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    Cited by:

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    3. Shen, Xiaojun & Wei, Hongyang & Wei, Li, 2020. "Study of trackside photovoltaic power integration into the traction power system of suburban elevated urban rail transit line," Applied Energy, Elsevier, vol. 260(C).
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    5. Miloud Rezkallah & Sanjeev Singh & Ambrish Chandra & Bhim Singh & Hussein Ibrahim, 2020. "Off-Grid System Configurations for Coordinated Control of Renewable Energy Sources," Energies, MDPI, vol. 13(18), pages 1-25, September.
    6. Carlos Andrés Ramos-Paja & Juan David Bastidas-Rodríguez & Daniel González & Santiago Acevedo & Julián Peláez-Restrepo, 2017. "Design and Control of a Buck–Boost Charger-Discharger for DC-Bus Regulation in Microgrids," Energies, MDPI, vol. 10(11), pages 1-26, November.

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