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State of Charge Balancing for Distributed Battery Units Based on Adaptive Virtual Power Rating in a DC Microgrid

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Abstract

This paper proposes an adaptive virtual power rating method for state of charge (SoC) balancing among distributed battery units (BUs) in a DC microgrid. The virtual power rating is flexibly determined according to the SoC to obtain the droop gain of BU, and the balanced SoC is achieved by means of the modified droop controller. Because an accurate power sharing among BUs is satisfied by using only virtual power rating, SoC balancing performance is consistently ensured regardless of the line resistance difference. Moreover, the voltage restoration to keep the grid voltage at a desired value is easily realized without PI controller, and the proposed control strategy is implemented based on the distributed control method with simple low-bandwidth communication. The system stability is investigated, and the performance of the control method is demonstrated through both simulations and experiments.

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Acknowledgements

This work was supported in part by the National Research Foundation of Korea Grant funded by the Korean Government under Grant NRF-2018R1D1A1A09081779 and in part by the Korea Institute of Energy Technology Evaluation and Planning and the Ministry of Trade, Industry and Energy under Grant No. 20194030202310

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  1. University of Ulsan, Ulsan, Republic of Korea

    Khanh Duc Hoang & Hong-Hee Lee

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  1. Khanh Duc Hoang
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Correspondence to Hong-Hee Lee.

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Hoang, K.D., Lee, HH. State of Charge Balancing for Distributed Battery Units Based on Adaptive Virtual Power Rating in a DC Microgrid. J. Electr. Eng. Technol. 15, 2121–2131 (2020). https://doi.org/10.1007/s42835-020-00482-x

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  • DOI: https://doi.org/10.1007/s42835-020-00482-x

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