Integrated Charging of EVs Using Existing LVDC Light Rail Infrastructure: A Case Study

Abstract

This paper outlines an approach to integrating electric vehicle (EV) charging systems to existing low voltage direct current (LVDC) public electrical transport infrastructure. Existing utility networks face challenges of accommodating a multitude of new connections associated with the adoption of EV charging infrastructure but when present, electrical light rail or tram networks represent a good opportunity to provide fast construction and less disruptive city centre charging implementation. Light rail network operation requires immediate power capacity to be available from any point on the network but if this margin were to be relaxed it opens up opportunities for sharing the available capacity with EV charging systems. This paper presents an electrical capacity assessment based on four separate charging control strategies applied to the public tram system in the City of Edinburgh, Scotland. The results of these studies, earthing and wider system protection requirements are considered and preliminary findings made.

Electric Vehicle Charging from Tramway Infrastructure: A New Concept and the Turin Case Study

“…This paper originated from the rethinking of the already greener electric public transport network that provides passenger transport service in more than 400 cities worldwide, the tramway. In fact, urban public transport electric grids, like those which power tramways and trolleybuses, are oversized and underutilized [22], making them a great opportunity for the integration of high-power charging points, which has been investigated in several research studies [23][24][25][26][27][28][29].…”

Harmonic and Supraharmonic Emissions of Plug-In Electric Vehicle Chargers

“…• Voltage unbalance, troublesome in the case of numerous, albeit low-power, singlephase charging loads; • Voltage fluctuation, in particularm caused by fast charging and uncoordinated charging sessions [5,6]; • Verification of suitability of LV distribution elements, such as MV/LV cabin transformers and feeders; • Dynamic peak shaving and exploitation of renewables and smart storage [7], including integration with other electrified transportation systems [8,9]; • Balancing power demand by economic incentives and regulations to push the peaks of exploitation to more attractive times of the day.…”