Electric Vehicle Charging Impacts by Increasing Demand and Varying Customer Charging Behaviors

This paper presents the impact evaluation of a possible massive implementation of EV charging facilities over the electric distribution grid of Bogota, Colombia. Chargers are represented using a model based on tests with real charging systems. Likewise, the topologies used are based on existing networks. The simulation method adopted offers the possibility of comparing different charging scenarios for each studied network. The main evaluation criteria are: voltage behavior in the nodes, voltage regulation and chargeability of the distribution transformers. Simulation results are given by comparing quantitative values obtained via progressive inclusion of chargers in the distribution network. The presented values depict three different scenarios: office use (slow daytime charging), residential use (slow nighttime charging) and commercial use (semi-fast daytime charging).The impact on the distribution network produced by massive EV recharge depends mainly on the behavior of users: start time and duration of recharge.