A Three-phase Bidirectional Charger using Robust Control

This thesis presents a robust control strategy of a three-phase off board bidirectional AC-DC battery charger for electric vehicle. The bidirectional charger also allows to use the full electric vehicle as an energy storage system for the electric grid, charging the in the peak-of times and delivering the energy back to the AC source in peak times of electrical consumption. In discharging mode, the bidirectional charger maintains constant active power flow to grid with a given reference. The proposed control consists of inner-lop robust control and outer-lop conventional PI control. For the inner-lop robust control, a state feedback controller with integral action is employed in dq-synchronous frame. The set of stabilizing gains of this controller are determined by a Linear Matrix Inequality (LMI)-based optimization so that the convergence time to steady stead is minimized in the occurrence of the parametric uncertainties of the L-filter. The efficacy of the proposed controller is verified through simulations.