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Variable Universe Fuzzy Control for Battery Equalization

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Abstract

In order to avoid the overcharge and overdischarge damages, and to improve the lifetime of the lithium-ion batteries, it is essential to keep the cell voltages in a battery pack at the same level, i.e., battery equalization. Based on the bi-directional modified Ćuk converter, variable universe fuzzy controllers are proposed to adaptively maintain equalizing currents between cells of a serially connected battery pack in varying conditions. The inputs to the fuzzy controller are the voltage differences and the average voltages of adjacent cell pairs. A large voltage difference requires large equalizing current while adjacent cells both with low/high voltages can only stand small discharge/charge currents. Compared with the conventional fuzzy control method, the proposed method differs in that the universe can shrink or expand as the effects of the input changes. This is important as the input may change in a small range. Simulation results demonstrate that the proposed variable universe fuzzy control method has fast equalization speed and good adaptiveness for varying conditions.

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Authors and Affiliations

  1. The State Key Laboratory of Industrial Control Technology, College of Control Science and Engineering, Zhejiang University, Hangzhou, 310027, China

    Jian Zheng, Jian Chen & Quan Ouyang

Authors
  1. Jian Zheng
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  2. Jian Chen
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  3. Quan Ouyang
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Corresponding author

Correspondence to Jian Chen.

Additional information

This research was supported by the National Natural Science Foundation of China under Grant Nos. 61433013 and 61621002.

This paper was recommended for publication by Guest Editor XIN Bin.

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Zheng, J., Chen, J. & Ouyang, Q. Variable Universe Fuzzy Control for Battery Equalization. J Syst Sci Complex 31, 325–342 (2018). https://doi.org/10.1007/s11424-018-7366-7

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  • DOI: https://doi.org/10.1007/s11424-018-7366-7

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