Journal
IET POWER ELECTRONICS
Volume 7, Issue 11, Pages 2758-2764Publisher
WILEY
DOI: 10.1049/iet-pel.2013.0746
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This study introduces a novel hybrid method for state of charge (SOC) estimation of lithium-ion battery types using extended H-infinity filter and radial basis function (RBF) networks. The RBF network's parameters are adjusted off-line by acquired data from the battery in charging step. This kind of neural network approximates the non-linear function utilised in the statespace equations of the extended H-infinity filter. The advantages of the proposed method are 3-fold: (i) it is not necessary to require the measurement and process noise covariance matrices as Kalman filter, (ii) the SOC is directly estimated and (3) it is a robust estimator in the sense of H-infinity criteria. The state variables are composed of the SOC and the battery terminal voltage. The experimental results illustrate the feasibility of the proposed method in terms of robustness, accuracy and convergence speed.
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