Journal
ENERGY
Volume 260, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2022.125083
Keywords
State of charge estimation; Cubature kalman filter; Generalized maximum correntropy criterion; Non -Gaussian noise
Categories
Funding
- National Key R. D Program of China [2021YFB2401904]
- Joint Fund project of the National Natural Science Foundation of China [U21A20485]
- National Natural Science Foundation of China [61976175, 51877174]
- Key Project of Natural Science Basic Research Plan in Shaanxi Province of China
- Key Laboratory Project of Shaanxi Provincial Education Department Scientific Research Projects [20JS109]
- Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing
- Project of Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education (Northeast Electric Power University) [MPSS2021-10]
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A robust CKF enhanced by the generalized maximum correntropy criterion (GMCC) is developed in this work, which can accurately estimate the SOC of lithium batteries under different operating conditions, especially in the presence of non-Gaussian noise, demonstrating its excellent performance.
Kalman filters (KFs) are widely used for state-of-charge (SOC) estimation of Li-ion batteries due to their excellent dynamic tracking capability. Especially the cubature KF (CKF), with the computational efficiency and nonlinear processing ability, is an outstanding candidate for SOC estimation. However, the actual working conditions are complex and changeable, and the measurement data is usually accompanied by non-Gaussian noise (outliers). Therefore, the performance of the original CKF with minimum mean square error (MMSE) criterion may be degraded seriously in these cases. In order to enhance the robustness of CKF, the MMSE in the CKF framework is substituted by the generalized maximum correntropy criterion (GMCC), and thus a robust CKF with GMCC (GMCC-CKF) is developed by fixed point iteration approach in this work. Furthermore, a SOC estimation model via the GMCC-CKF is proposed to improve estimation accuracy under non-Gaussian noise environments. The simulation results show that, compared with the traditional KFs, the proposed GMCC-CKF can accurately esti-mate the SOC of lithium batteries under different temperatures and operating conditions considering non -Gaussian noise interference. The results of mean absolute error (MAE) and root mean square error (RMSE) are less than 1%, which verifies the excellent performance of GMCC-CKF.
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