Evaluation of Electric Vehicle Charging on Distribution Transformer Loading

The objective of this work is to evaluate the insertion of Electric Vehicles (EVs) on a distribution system. Motivated by the shortage of deterministic data regarding to the power demand required by EV charging in Brazil, a probabilistic methodology is proposed to estimate this impact. For that, energy consumption and urban mobility patterns from a pilot region are used to compose the distribution transformer load curve. Both energy consumption for EVs and typical consumer demand take into account the probabilistic nature of load. Therefore, the Monte Carlo method applies for both situations, Base Scenario and EV Scenario. From the union of both scenarios, the load curve of the distribution transformer is evaluated regarding to the influence of different EV penetration levels. The results can be used by energy distributors as a support tool for the decision to prioritize the investments in distribution transformers.