SOC estimation of lithium battery with weighted multi-innovation adaptive Kalman filter algorithm
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更新:2022-05-22 23:33:11
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摘要
For the second-order equivalent circuit model of lithium batteries, in order to improve the accuracy of the extended Kalman filter (EKF) algorithm, a weighted multi-innovation adaptive Kalman filter (MI-AEKF) method is investigated for battery SOC estimation. Improve information utilization by expanding the single innovation from current time to multiple innovations containing current and historical time information Considering the influence of present and past data, a weighted multiple information theory is studied. Experiments are carried out under different working conditions. Considering noise variation, a recursive noise estimation based extended Kalman filter algorithm is adopted to realize adaptive correction of noise, and the results show that the method effectively reduces the divergence of the filtering and enhances the estimation accuracy and stability of the algorithm.
关键词
lithium battery; state of charge(SOC); multi-information; extended Kalman filte
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