Modeling of the Electric Vehicle Charging Process - Part 2

Abstract

In the first part of the report, a charging/discharging model of a Li-ion battery powered by an ideal DC voltage source is presented. The model allows the operation of the battery in two modes - grid to vehicle $(\mathrm{G}2\mathrm{V})$ and vehicle to grid $(\mathrm{V}2\mathrm{G})$. Switching between the two modes can be done at any time in both directions, while simultaneously adjusting (setting) the charge/discharge current of the battery. In this second part of the report, a brief overview of the technical parameters of EV batteries and charging stations, as well as the trends of their development and use, is made. In addition, the Li-ion battery charging/discharging model has been further developed, with the power supply being from the medium voltage grid and a transformer substation. A reversible inverter is added to the elements of the charging station, and a conventional load is also included to the substation. The model allows the station to operate in two modes: $\mathrm{G}2\mathrm{V}$ and $\mathrm{V}2\mathrm{G}$. The results of the simulations are presented.