期刊
JOURNAL OF ENERGY STORAGE
卷 24, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.est.2019.100810
关键词
Lithium-ion capacitor; Electrical characteristics; Model parameters identification; State of charge estimation; Adaptive square root cubature Kalman filter
资金
- National Natural Science Foundation of China [51721005]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDA21050302]
- Beijing Municipal Science and Technology Commission [Z171100000917007]
Lithium-ion capacitor is a hybrid electrochemical energy storage device which combines the merits of lithium-ion battery and electric double-layer capacitor. The precise state of charge estimation is essential to utilize lithium-ion capacitor efficiently. In this paper, the electrical characteristics of lithium-ion capacitor have been studied and the corresponding equivalent circuit model is established. Then, an adaptive square root cubature Kalman filter with variable forgetting factor recursive least square has been proposed to achieve state of charge estimation at each sampling step. The proposed method identifies the model parameters and noise statistics in real time, leading to obtain accurate SOC estimation even if the method is initialized with inaccurate parameters. Estimations under four working conditions are quantitatively studied, the experimental results show that the proposed method has better performance and the corresponding maximum root mean square error is controlled within 1%. Furthermore, the verification of robustness illustrates that the proposed method remains stability and acceptable accuracy when external interference and inaccurate initial SOC are included.
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