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Buffered Microgrids with Modular Back-to-Back Converter Grid Interface

Author

Listed:
  • Nachat Nasser

    (General Electric, Grid Solutions, Stafford ST16 1WS, UK)

  • Meghdad Fazeli

    (Energy Safety Research Institute, College of Engineering, Swansea University, Swansea SA1 8EN, UK)

  • Ahmed A. Aboushady

    (SMART Technology Centre, School of Computing, Engineering and Built Environment, Glasgow Caledonian University, Glasgow G4 0BA, UK)

Abstract

This paper proposes a buffered microgrid with a modular grid interface consisting of a modular back-to-back converter. The proposed method provides a flexible strategy that enables both the load and generation expansion of the microgrid, with no sizing constraints on the initial stage. The method maintains the physical separation of the buffered microgrid from the grid by using back-to-back converters, which ensures a safe, secure and seamless operation in both islanded and grid-connected operation modes. The proposed modular structure allows an energy exchange prioritization either between the energy storage systems and the grid or between the energy storage units themselves, depending on the recommended/desired operational strategy. The prioritizations are achieved by using sets of dead zones in the control of the interfacing converters. In order to control the voltage and frequency, an inverse-droop-based dq-frame current control method was implemented in PSCAD/EMTDC to substantiate the proposed method. The simulation results of different scenarios show the operational flexibility, control simplicity and communication-free operation of the microgrid with different types of sources.

Suggested Citation

  • Nachat Nasser & Meghdad Fazeli & Ahmed A. Aboushady, 2022. "Buffered Microgrids with Modular Back-to-Back Converter Grid Interface," Energies, MDPI, vol. 15(21), pages 1-16, October.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:21:p:7879-:d:951630
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    References listed on IDEAS

    as
    1. Hirsch, Adam & Parag, Yael & Guerrero, Josep, 2018. "Microgrids: A review of technologies, key drivers, and outstanding issues," Renewable and Sustainable Energy Reviews, Elsevier, vol. 90(C), pages 402-411.
    2. Fazal Muhammad & Haroon Rasheed & Ihsan Ali & Roobaea Alroobaea & Ahmed Binmahfoudh, 2022. "Design and Control of Modular Multilevel Converter for Voltage Sag Mitigation," Energies, MDPI, vol. 15(5), pages 1-26, February.
    3. Aiman J. Albarakati & Younes Boujoudar & Mohamed Azeroual & Reda Jabeur & Ayman Aljarbouh & Hassan El Moussaoui & Tijani Lamhamdi & Najat Ouaaline, 2021. "Real-Time Energy Management for DC Microgrids Using Artificial Intelligence," Energies, MDPI, vol. 14(17), pages 1-16, August.
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