engleski

Comparison of Two Battery Charging Control System Designs without and with SoC Estimator

This paper presents two designs of constant- current/constant voltage battery charging control systems in the form of a cascade control system arrangement with the superimposed proportional- integral (PI) controller commanding the battery charging current reference to the inner PI controller-based current control loop. The superimposed control level can be realized as: (i) battery terminal voltage limiting control loop, or (ii) battery state-of-charge (SoC) control loop based on SoC estimation using an extended Kalman filter (EKF), augmented by the aforementioned battery terminal voltage controller for preventing battery over-voltages. The control system design is based on the suitable control-oriented model of the battery charging process and utilization of damping optimum criterion. The effectiveness of the proposed battery charging control system has been verified by means of simulations using the readily available model of a lithium-iron- phosphate (LiFePO4) battery cell.

Lithium-Iron-Phosphate Battery Cell ; Constant-Current/Constant Voltage Charging ; Cascade Control ; State-of-Charge Estimation ; Extended Kalman Filter ; Simulations

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