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Related Experiment Video

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Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator
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Master-Slave Cooperation for Multi-DC-MGs via Variable Cyber Networks.

Xiaoqing Lu, Jingang Lai, Guo-Ping Liu

    IEEE Transactions on Cybernetics
    |April 19, 2021
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    Summary

    Interconnecting microgrids (MGs) enhances reliability by sharing power. This study introduces a master-slave framework for multiple DC MG clusters, achieving accurate current sharing and economical power allocation efficiently.

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    Area of Science:

    • Electrical Engineering
    • Power Systems Engineering

    Background:

    • Microgrid (MG) reliability can be improved through interconnection, enabling power sharing between proximate MGs.
    • Multiple DC MG clusters with heterogeneous distributed generators (DGs) present challenges in coordinated control and power management.

    Purpose of the Study:

    • To establish a master-slave cooperation framework with a two-layer voltage estimator for multiple DC MG clusters.
    • To achieve simultaneous accurate current sharing and economical current allocation among interconnected MGs.
    • To ensure system stability and robustness in uncertain communication environments.

    Main Methods:

    • A master-slave cooperation framework with a two-layer voltage estimator is proposed.
    • Master-DGs manage economical allocation across MG clusters and control slave-DGs for current sharing.
    • Sufficient conditions for system stability are deduced based on control time constants.

    Main Results:

    • The proposed control strategy achieves accurate current sharing and economical current allocation simultaneously.
    • The strategy demonstrates faster convergence and reduced time consumption compared to previous methods.
    • The system exhibits robustness against uncertain communication environments and frequent switching operations.

    Conclusions:

    • The developed master-slave framework effectively enhances the reliability and efficiency of interconnected DC microgrids.
    • The two-layer voltage estimator and control strategy ensure stable and robust operation under dynamic conditions.
    • The approach is validated through simulations in MATLAB/SimPowerSystems, confirming its practical applicability.