Noise-Immune Model Identification and State-of-Charge Estimation for Lithium-Ion Battery Using Bilinear Parameterization

Zhongbao Wei, Guangzhong Dong, Xinan Zhang, Josep Pou, Zhongyi Quan, Hongwen He

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Accurate estimation of state of charge (SOC) is critical to the safe and efficient utilization of a battery system. Model-based SOC observers have been widely used due to their high accuracy and robustness, but they rely on a well-parameterized battery model. This article scrutinizes the effect of measurement noises on model parameter identification and SOC estimation. A novel parameterization method combining instrumental variable (IV) estimation and bilinear principle is proposed to compensate for the noise-induced biases of model identification. Specifically, the IV estimator is used to reformulate an overdetermined system so as to allow coestimating the model parameters and noise variances. The coestimation problem is then decoupled into two linear subproblems which are solved efficiently by a two-stage least squares algorithm in a recursive manner. The parameterization method is further combined with a Luenberger observer to estimate the SOC in real time. Simulations and experiments are performed to validate the proposed method. Results reveal that the proposed method is superior to existing method in terms of the immunity to noise corruption.

Original languageEnglish
Article number8951446
Pages (from-to)312-323
Number of pages12
JournalIEEE Transactions on Industrial Electronics
Volume68
Issue number1
DOIs
Publication statusPublished - Jan 2021

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