Model predictive control of the AC voltage of an electric-vehicle charging station with ESS

With the recent rapid expansion of electric vehicles, a large number of Electric Vehicle Supply Equipment (EVSE) have been installed. As a result, the impact of EV chargers on the power system is being significantly increased. In particular, the EVSE connected to the distribution network line may act as a peak load, which can adversely affect the voltage stability of the distribution network system when the electric vehicle is quickly charged. In this paper, a Model Predictive Control (MPC) algorithm with disturbance observer (DOB) is proposed for stabilizing voltage of EVs Charging Station which is composed of EV chargers, Photovoltaic (PV), Energy Storage System (ESS) and Loads. The proposed DOB estimate the sum of total current which is the source of voltage fluctuations due to line impedance in the EV charging station. The grid voltage remains stable under the various operating condition including the extreme scenarios by proposed methods. Simulations are performed by means of MATLAB/SIMULINK and result shows the effectiveness of the proposed DOB and MPC control scheme.