Abstract:

Currently the requirements to be met by the low-voltage grid are increasing. In addition to the growth of the distributed power supply the starting e-mobility is the main cause for this change. The study shows that electric vehicles would be the first parts of a smart grid. With the increase of the number of electric vehicles the requirement of communication systems grows.  This paper contains the simulation of different low-voltage grids with a high number of connected electric vehicles. One of the results is that the utilization of the distribution transformer is the limiting criterion for a high number of electric vehicles in urban low-voltage grids. The comparison between urban and rural grid shows that the voltage drop is the limiting criterion in rural low-voltage grids. The charging of a high number of electric vehicles in urban low-voltage grids is possible with controlled charging.