Electromagnetic Transient Simulation Modelling and Analysis of Electric Vehicle Charging Stations

High-power chargers using modern power electronics are highly non-linear power consumption devices that generate harmonic pollution to the power grid. In contrast, a high-current power supply takes less time and is favourable to the promotion of electric vehicles, but the harmonic currents generated during charging will degrade the power quality of the power system. In this paper, a simplified model of the charger is proposed, in which a nonlinear resistor R
c
is used to approximately simulate the equivalent input resistance of the high-frequency power conversion link, and the correspondence between the charging power and the equivalent resistance is given. Based on the data of a demonstration charging station, a single-machine grid-connected model as well as a multi-machine grid-connected model are constructed on the ADPSS platform, and harmonic analyses of the charging station are carried out, focusing on the study of the harmonic current containment rate of each harmonic, and the law of the total harmonic distortion rate of the current with the change of charging power of the electric vehicle.