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A nonlinear fractional-order H ~∞~ observer for SOC estimation of battery pack of electric vehicles by Wei Yue; Cong-zhi Liu; Liang Li; Xiang Chen; Fahad Muhammad is a Engineering article available to read on EtoBox.

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This work is focused on designing a fractional-order H ' observer and applying it into the state of charge (SOC) estimation for lithium-ion battery pack system. Firstly, a fractional order equivalent circuit model based on the fractional capacitor is established and identified. Secondly, the SOC estimation method based on the fractional-order H ' observer is proposed. The nonlinear intrinsic relationship between the open-circuit voltage and SOC is described as a polynomial function, and its Lipschitz proposition has been discussed. Then, the nonlinear observer design criterion is established based on the Lyapunov method. Finally, the effectiveness of the proposed method is verified with high accuracy and robustness by the experiment results.

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Author

Wei Yue; Cong-zhi Liu; Liang Li; Xiang Chen; Fahad Muhammad

Publisher

SAGE Publications

Published

2021

Language

EN

Field

Engineering (Physical Sciences)