Influence Analysis and Optimization of Sampling Frequency on the Accuracy of Model and State-of-Charge Estimation for LiNCM Battery

Pingwei Gu, Zhongkai Zhou, Shaofei Qu, Chenghui Zhang and Bin Duan
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Pingwei Gu: School of Control Science and Engineering, Shandong University, Shandong 250061, China
Zhongkai Zhou: School of Control Science and Engineering, Shandong University, Shandong 250061, China
Shaofei Qu: School of Control Science and Engineering, Shandong University, Shandong 250061, China
Chenghui Zhang: School of Control Science and Engineering, Shandong University, Shandong 250061, China
Bin Duan: School of Control Science and Engineering, Shandong University, Shandong 250061, China

Energies, 2019, vol. 12, issue 7, 1-19

Abstract: Battery characterization data is the basis for battery modeling and state estimation. It is generally believed that the higher the sampling frequency, the finer the data, and the higher the model and state estimation accuracy. However, scientific selection strategy for sampling frequency is very important but rarely studied. This paper studies the influence of sampling frequency on the accuracy of battery model and state estimation under four different sampling frequencies: 0.2 Hz, 1 Hz, 2 Hz, and 10 Hz. Then, a function is proposed to depict the relationship between accuracy and sampling frequency, which shows an optimal selection principle. The iterative identification algorithm is presented to identify the model parameters, and state-of-charge (SOC) is estimated via extended Kalman filter algorithm. Experimental results with different operating conditions clearly show the relationship between sampling frequency, accuracy, and data quantity, and the proposed selection strategy has high practical value and universality.

Keywords: lithium-ion battery; sampling frequency; model accuracy; SOC accuracy; data quantity (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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