Impact of Different Charging Strategies on the Grid Expansion Needs of Distribution Grids

Abstract:
The expected increase in electro mobility and its charging infrastructure poses new challenges to distribution system operators. Similar to the integration of renewable energy sources, the question arises whether network operators should design the grid for the maximum peak load or should apply charging strategies to reduce stress to the grid. Based on a method for regionalizing the charging infrastructure and generating charging profiles [1], this paper examines the effects of different charging strategies on the grid expansion needs for real low-voltage grids. For this purpose, this publication compares the uncontrolled charging of electric vehicles with various controlled charging profiles and strategies. Simula-tion results show grid expansion needs for scenarios with large capacities of charging stations. Depending on the case, controlled charging strategies can reduce this needs but could also lead to new congestions with a poor strategy design.