State of Charge (SOC) determination is an increasingly important issue in battery energy storage system. Precise knowledge of SOC allows the controller to confidently use the battery pack's full operating range without fear of over-or under-charging cells. Taking into account of some transformed parameters like voltage and current, this paper describes a novel adaptive online approach to determinate SOC for lead-acid batteries by combining modified PID controller with RBFNN based terminal voltage evaluation model, which is used to simulate battery's behavior while it is under load. Results of lab tests on physical cells, compared with model prediction, are presented. Results show that the ANN based terminal voltage evaluation model simulates battery system with great accuracy, and the prediction value of SOC simultaneously converges to the real value quickly within the error of 1% ± as time goes on.
To remedy the disadvantages of conventional diesel engine fuel ejection system's fault diagnosis method, which couldn't get exact results and dispel noise effectively, a new way based on Wavelet Neural Network (WNN) which combines merits of Wavelet Transform (WT) and RBF Neural Network (RBFNN) was put forward. Moreover, after picking up fault characteristic parameters, we trained it with Genetic Algorithm (GA) and Simulated Annealing (SA). Finally we applied the improved WNN to fault diagnosis of diesel engine fuel ejection system. The results show that the algorithm is good at dispelling noise, stable, and effective in high precise fault diagnosis.
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