Browsing by Author "Alghamdi, Baheej"

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    Frequency and voltage coordinated control of a grid of AC/DC microgrids
    (Elsevier BV, 2022-01-17) Alghamdi, Baheej; Cañizares, Claudio
    This paper proposes a hierarchical control scheme based on a distributed controller design for a multi-microgrid system. Thus, a proposed control approach of ac and dc microgrid interfaces is presented, based on virtual synchronous generators to control the power exchange of the interconnected microgrids, and provide frequency support, voltage regulation, and virtual inertia for the individual microgrids and ac host grid. A hierarchical distributed control technique is proposed, with primary controls of interfacing virtual synchronous generators providing adaptive inertia for all ac systems, while a secondary distributed control regulates the frequency and the voltages of the ac host grid and the interconnected ac and dc microgrids, based on a consensus technique with limited information about the overall system. The proposed controller shares the total system load among the grid and microgrids, while minimizing the overall frequency and dc-voltage deviations in all interconnected systems. The presented interface and the controller are implemented, tested, and validated using time-domain simulations for a multi-microgrid test system, which is based on a CIGRE benchmark medium voltage system and consists of both ac and dc microgrids.
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    Frequency Regulation in Isolated Microgrids Through Optimal Droop Gain and Voltage Control
    (Institute of Electrical and Electronics Engineers (IEEE), 2021-10-02) Alghamdi, Baheej; Canizares, Claudio A.
    This article presents an adaptive active power droop controller and voltage setpoint control in isolated microgrids for optimal frequency response and stability after disturbances. The control scheme involves an optimal and model predictive control approach that continuously adjusts the active power droop gains and the voltage setpoints of Distributed Energy Resources (DERs) to maintain the frequency of the system within acceptable limits and enhance the primary frequency response of the system, while taking into account the active power sensitivity of the microgrid loads to the system's operating voltage. The proposed control scheme is tested, validated, and compared with previously proposed techniques using time-domain simulations for a test system based on a CIGRE medium voltage benchmark microgrid under different realistic conditions, demonstrating the advantages of the proposed approach.