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

Khanh Duc Hoang; Hong-Hee Lee

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

Khanh Duc Hoang

Hong-Hee Lee

Vol. 21, No. 2, pp. 405-415, Feb. 2021

10.1007/s43236-020-00188-3

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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Cite this article

[IEEE Style]

K. D. Hoang and H. Lee, "State of charge balancing for distributed batteries in DC microgrids without communication networks," Journal of Power Electronics, vol. 21, no. 2, pp. 405-415, 2021. DOI: 10.1007/s43236-020-00188-3.

[ACM Style]

Khanh Duc Hoang and Hong-Hee Lee. 2021. State of charge balancing for distributed batteries in DC microgrids without communication networks. Journal of Power Electronics, 21, 2, (2021), 405-415. DOI: 10.1007/s43236-020-00188-3.