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State of charge balancing for distributed batteries in DC microgrids without communication networks

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Abstract

State of charge (SoC) balancing and accurate power sharing have been achieved among distributed batteries in a DC microgrid without a communication network by injecting an AC signal. The frequency of the generated signal is proportional to the SoC of a predefined master battery and it is used for the other batteries as a common variable to estimate the SoC and output power of the master battery. Based on modified droop control, the distributed batteries realize a balanced SoC and accurate power sharing regardless of the differences in the line resistance. A communication system is not required. Thus, the system cost is notably reduced. Moreover, to guarantee system reliability, a new master battery selection method is provided to replace the master battery under fault conditions. The effectiveness of the proposed strategy was verified by simulations and experimental results.

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Acknowledgements

This work was supported in part by the NRF of Korea Grant under Grant NRF-2018R1D1A1A09081779 and in part by the KETEP and the MOTIE under Grant 20194030202310.

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Authors and Affiliations

  1. School of Electrical Engineering, University of Ulsan, Ulsan, Korea

    Khanh Duc Hoang & Hong-Hee Lee

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

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Hoang, K.D., Lee, HH. State of charge balancing for distributed batteries in DC microgrids without communication networks. J. Power Electron. 21, 405–415 (2021). https://doi.org/10.1007/s43236-020-00188-3

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  • DOI: https://doi.org/10.1007/s43236-020-00188-3

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