Journal
COMPUTERS & CHEMICAL ENGINEERING
Volume 64, Issue -, Pages 114-123Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.compchemeng.2014.02.015
Keywords
Adaptive gain sliding mode observer; Battery management system; Combined battery equivalent circuit model; Electric vehicle; Lithium-polymer battery; State of charge
Funding
- Commonwealth of Australia, through the Cooperative Research Centre for Advanced Automotive Technology (AutoCRC), under the project of Electric Vehicle Control Systems and Power Management [C2-801]
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An adaptive gain sliding mode observer (AGSMO) for battery state of charge (SOC) estimation based on a combined battery equivalent circuit model (CBECM) is presented. The error convergence of the AGSMO for the SOC estimation is proved by Lyapunov stability theory. Comparing with conventional sliding mode observers for the SOC estimation, the AGSMO can minimise chattering levels and improve the accuracy by adaptively adjusting switching gains to compensate modelling errors. To design the AGSMO for the SOC estimation, the state equations of the CBECM are derived to capture dynamics of a battery. Alithium-polymer battery (LiPB) is used to conduct experiments for extracting parameters of the CBECM and verifying the effectiveness of the proposed AGSMO for the SOC estimation. (C) 2014 Elsevier Ltd. All rights reserved.
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