Power Sharing Stabilization by Fractional-Order Control in Islanded Microgrids

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    Abstract

    In islanded microgrids (MGs), power-sharing dynamics constitute the low-frequency dominant modes that directly affect the overall MG stability. The conventional droop is known to have a tradeoff between stability margin and fast/accurate power sharing. In this paper, the fractional-order derivative (FOD) droop controller is proposed to improve the power-sharing dynamics without affecting the steady-state power-sharing accuracy. FOD terms are added to the frequency and voltage loops of the conventional droop controller to add extra degrees of freedom. The suggested controller is tested and compared with the well-known integer-order derivative (IOD) droop on a stability benchmark three DG system. The proposed controller's fractional orders are enough to achieve better dynamic performance than the IOD droop at the same controller gains. Another case study is investigated where the proposed controller is used to reduce the transient behavior of circulating current for converters connected to the same AC bus, which again shows the superiority of the proposed controller over the IOD droop.

    Original languageBritish English
    Title of host publicationIECON 2023 - 49th Annual Conference of the IEEE Industrial Electronics Society
    PublisherIEEE Computer Society
    ISBN (Electronic)9798350331820
    DOIs
    StatePublished - 2023
    Event49th Annual Conference of the IEEE Industrial Electronics Society, IECON 2023 - Singapore, Singapore
    Duration: 16 Oct 202319 Oct 2023

    Publication series

    NameIECON Proceedings (Industrial Electronics Conference)
    ISSN (Print)2162-4704
    ISSN (Electronic)2577-1647

    Conference

    Conference49th Annual Conference of the IEEE Industrial Electronics Society, IECON 2023
    Country/TerritorySingapore
    CitySingapore
    Period16/10/2319/10/23

    Keywords

    • Derivative Droop
    • Fractional Control

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