State of Charge Estimation for Lithium-Ion Battery Based on Nonlinear Observer: An H ? Method

Qiao Zhu, Neng Xiong, Ming-Liang Yang, Rui-Sen Huang and Guang-Di Hu
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Qiao Zhu: School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Neng Xiong: School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Ming-Liang Yang: School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Rui-Sen Huang: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Guang-Di Hu: School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China

Energies, 2017, vol. 10, issue 5, 1-19

Abstract: This work is focused on the state of charge (SOC) estimation of a lithium-ion battery based on a nonlinear observer. First, the second-order resistor-capacitor (RC) model of the battery pack is introduced by utilizing the physical behavior of the battery. Then, for the nonlinear function of the RC model, a one-sided Lipschitz condition is proposed to ensure that the nonlinear function can play a positive role in the observer design. After that, a nonlinear observer design criterion is presented based on the H ? method, which is formulated as linear matrix inequalities (LMIs). Compared with existing nonlinear observer-based SOC estimation methods, the proposed observer design criterion does not depend on any estimates of the unknown variables. Consequently, the convergence of the proposed nonlinear observer is guaranteed for any operating conditions. Finally, both the static and dynamic experimental cases are given to show the efficiency of the proposed nonlinear observer by comparing with the classic extended Kalman filter (EKF).

Keywords: lithium-ion battery; state of charge estimation; nonlinear observer; H ? method; linear matrix inequality (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (10)

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