New modeling approach of secondary control layer for autonomous single-phase microgrids

BENDIB, Ahmed, CHOUDER, Aissa, KARA, Kamel, KHERBACHI, Abdelhammid, BARKAT, Said and ISSA, Walid (2019). New modeling approach of secondary control layer for autonomous single-phase microgrids. Journal of the Franklin Institute, 356 (13), 6842-6874.

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    In a microgrid (MG) topology, the secondary control is introduced to compensate for the voltage amplitude and frequency deviations, mainly caused by the inherent characteristics of the droop control strategy. This paper proposes an accurate approach to derive small signal models of the frequency and amplitude voltage at the point of common coupling (PCC) of a single-phase MG by analyzing the dynamics of the second-order generalized integrator-based frequency-locked loop (SOGI-FLL). The frequency estimate model is then introduced in the frequency restoration control loop, while the derived model of the amplitude estimate is introduced for the voltage restoration loop. Based on the obtained models, the MG stability analysis and proposed controllers’ parameters tuning are carried out. Also, this study includes the modeling and design of the synchronization control loop that enables a seamless transition from island mode to grid-connected mode operation. Simulation and practical experiments of a hierarchical control scheme, including traditional droop control and the proposed secondary control for two single-phase parallel inverters, are implemented to confirm the effectiveness and the robustness of the proposal under different operating conditions. The obtained results validate the proposed modeling approach to provide the expected transient response and disturbance rejection in the MG.

    Item Type: Article
    Uncontrolled Keywords: Industrial Engineering & Automation; 0102 Applied Mathematics; 0906 Electrical and Electronic Engineering
    Identification Number:
    Page Range: 6842-6874
    SWORD Depositor: Symplectic Elements
    Depositing User: Symplectic Elements
    Date Deposited: 23 Jul 2019 12:00
    Last Modified: 18 Mar 2021 00:15

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