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An Optimal Control Scheme for Load Bus Voltage Regulation and Reactive Power-Sharing in an Islanded Microgrid

Author

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  • Muhammad Zahid Khan

    (School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
    Department of Electrical and Computer Engineering, COMSATS University Islamabad, Lahore 54000, Pakistan)

  • Chaoxu Mu

    (School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China)

  • Salman Habib

    (College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China
    Department of Electrical Engineering, University of Engineering and Technology, Lahore 54890, Pakistan)

  • Khurram Hashmi

    (Department of Electrical Engineering, University of Engineering and Technology, Lahore 54890, Pakistan)

  • Emad M. Ahmed

    (Department of Electrical Engineering, College of Engineering, Jouf University, Sakaka 72388, Saudi Arabia
    Department of Electrical Engineering, Faculty of Engineering, Aswan University, Aswan 81542, Egypt)

  • Waleed Alhosaini

    (Department of Electrical Engineering, College of Engineering, Jouf University, Sakaka 72388, Saudi Arabia
    Engineering and Applied Sciences Research Unit, Jouf University, Sakaka 72388, Saudi Arabia)

Abstract

This paper presents an optimal control scheme for an islanded microgrid (MG), which performs reactive power-sharing and voltage regulation. Two-fold objectives are achieved, i.e., the load estimation strategy, firstly, approximates the MG’s impedance and transmits this information through a communication link. Based on approximated impedance information, an optimal regulator is then constructed to send optimal control commands to respective local power controllers of each distributed generation unit. An optimal regulator is a constraints optimized problem, mainly responsible to restore the buses’ voltage magnitudes and realize power-sharing proportionally. The important aspect of this control approach is that the voltage magnitude information is only required to be transferred to each inverter’s controller. In parallel, a secondary control layer for frequency restoration is implemented to minimize the system frequency deviations. The MATLAB/Simulink and experimental results obtained under load disturbances show the effectiveness for optimizing the voltage and power. Modeling and analysis are also verified through stability analysis using system-wide mathematical small-signal models.

Suggested Citation

  • Muhammad Zahid Khan & Chaoxu Mu & Salman Habib & Khurram Hashmi & Emad M. Ahmed & Waleed Alhosaini, 2021. "An Optimal Control Scheme for Load Bus Voltage Regulation and Reactive Power-Sharing in an Islanded Microgrid," Energies, MDPI, vol. 14(20), pages 1-22, October.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:20:p:6490-:d:653128
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    References listed on IDEAS

    as
    1. Vandoorn, T.L. & De Kooning, J.D.M. & Meersman, B. & Vandevelde, L., 2013. "Review of primary control strategies for islanded microgrids with power-electronic interfaces," Renewable and Sustainable Energy Reviews, Elsevier, vol. 19(C), pages 613-628.
    2. Muhammad Zahid Khan & Chaoxu Mu & Salman Habib & Waleed Alhosaini & Emad M. Ahmed, 2021. "An Enhanced Distributed Voltage Regulation Scheme for Radial Feeder in Islanded Microgrid," Energies, MDPI, vol. 14(19), pages 1-19, September.
    3. Syed Ali Abbas Kazmi & Muhammad Khuram Shahzad & Akif Zia Khan & Dong Ryeol Shin, 2017. "Smart Distribution Networks: A Review of Modern Distribution Concepts from a Planning Perspective," Energies, MDPI, vol. 10(4), pages 1-47, April.
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    Cited by:

    1. Mojtaba Hajihosseini & Vinko Lešić & Husam I. Shaheen & Paknoosh Karimaghaee, 2022. "Sliding Mode Controller for Parameter-Variable Load Sharing in Islanded AC Microgrid," Energies, MDPI, vol. 15(16), pages 1-17, August.
    2. Omar Makram Kamel & Ahmed A. Zaki Diab & Mohamed Metwally Mahmoud & Ameena Saad Al-Sumaiti & Hamdy M. Sultan, 2023. "Performance Enhancement of an Islanded Microgrid with the Support of Electrical Vehicle and STATCOM Systems," Energies, MDPI, vol. 16(4), pages 1-19, February.

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