Imposed Source Current Predictive Control for Battery Charger Applications with Active Damping

This paper presents an imposed source current control technique based on model predictive control. This proposed control method can be used for battery charger applications fed from three-phase ac grid. The proposed MPC technique allows to charge the battery with a constant current or voltage as what is required for cyclic charge process of batteries. The proposed technique ensures unity input power factor operation for grid side. The single-objective cost function of the predictive control employs the error between supply current reference and supply current prediction and the switching state that makes this user defined cost function minimal is selected among the nine switching vector combinations of the current source rectifier so as to apply for next sampling interval. An active damping current term, that is predicted from the input filter capacitor voltage estimation is included in the cost function to alleviate the resonance phenomenon of input LC filter. The supply current references in phase with grid voltages are generated from grid voltages and the amplitude of this reference currents are generated from the charging requirements of the battery. The input filter model is used to predict the filter capacitor voltages at sampling intervals k and k+1 in order to eliminate sensor requirement for them. The control performance of proposed predictive controller is validated by simulation works in terms of steady-state behavior, dynamic response and supply current THD.

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