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Volume 11 Issue 2
Feb.  2024

IEEE/CAA Journal of Automatica Sinica

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Article Contents
Y. Yu, G.-P. Liu, Y. Huang, and  P. Shi,  “Optimal cooperative secondary control for islanded DC microgrids via a fully actuated approach,” IEEE/CAA J. Autom. Sinica, vol. 11, no. 2, pp. 405–417, Feb. 2024. doi: 10.1109/JAS.2023.123942
Citation: Y. Yu, G.-P. Liu, Y. Huang, and  P. Shi,  “Optimal cooperative secondary control for islanded DC microgrids via a fully actuated approach,” IEEE/CAA J. Autom. Sinica, vol. 11, no. 2, pp. 405–417, Feb. 2024. doi: 10.1109/JAS.2023.123942

Optimal Cooperative Secondary Control for Islanded DC Microgrids via a Fully Actuated Approach

doi: 10.1109/JAS.2023.123942
Funds:  This work was supported in part by the National Natural Science Foundation of China (62173255, 62188101), and Shenzhen Key Laboratory of Control Theory and Intelligent Systems, (ZDSYS20220330161800001)
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  • DC-DC converter-based multi-bus DC microgrids (MGs) in series have received much attention, where the conflict between voltage recovery and current balancing has been a hot topic. The lack of models that accurately portray the electrical characteristics of actual MGs while is controller design-friendly has kept the issue active. To this end, this paper establishes a large-signal model containing the comprehensive dynamical behavior of the DC MGs based on the theory of high-order fully actuated systems, and proposes distributed optimal control based on this. The proposed secondary control method can achieve the two goals of voltage recovery and current sharing for multi-bus DC MGs. Additionally, the simple structure of the proposed approach is similar to one based on droop control, which allows this control technique to be easily implemented in a variety of modern microgrids with different configurations. In contrast to existing studies, the process of controller design in this paper is closely tied to the actual dynamics of the MGs. It is a prominent feature that enables engineers to customize the performance metrics of the system. In addition, the analysis of the stability of the closed-loop DC microgrid system, as well as the optimality and consensus of current sharing are given. Finally, a scaled-down solar and battery-based microgrid prototype with maximum power point tracking controller is developed in the laboratory to experimentally test the efficacy of the proposed control method.

     

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    Highlights

    • This paper expands the study of modeling and secondary control of DC microgrids
    • The proposed microgrid modeling approach addresses the drawbacks of existing ones
    • The simple structure of the approach allows it to be easily implemented in microgrids
    • Secondary control based on the model demonstrates excellent regulation performance

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