Abstract
Transport is a main source of pollutants in cities, where air quality is a major concern. New transport technologies, such as electric vehicles, and public transport modalities, such as urban railways, have arisen as solutions to this important problem. One of the main difficulties for the adoption of electric vehicles by consumers is the scarcity of a suitable charging infrastructure. The use of the railway power supplies to charge electric vehicle batteries could facilitate the deployment of charging infrastructure in cities. It would reduce the cost because of the use of an existing installation. Furthermore, electric vehicles can use braking energy from trains that was previously wasted in rheostats. This paper presents the results of a collaboration between research teams from University of Rome Sapienza and Comillas Pontifical University. In this work, two real European cases are studied: an Italian metro line and a Spanish metro line. The energy performance of these metro lines and their capacity to charge electric vehicles have been studied by means of detailed simulation tools. Their results have shown that the use of regenerated energy is 98% for short interval of trains in both cases. However, the use of regenerated energy decreases as the train intervals grow. In a daily operation, an important amount of regenerated energy is wasted in the Italian and Spanish case. Using this energy, a significant number of electric vehicles could be charged every day.
Highlights
Air pollution is one of the main problems in urban areas because of its impact on public health and the environment [1]
This concern for air quality has raised the interest on urban railways, to improve the public transport service, and for electric vehicles (EVs), to reduce the impact of road traffic
The results show that a relevant number of EVs can be recharged from braking energy, in a busy metro line such as the Italian one, and in a line with less train frequency such as the Spanish one
Summary
Air pollution is one of the main problems in urban areas because of its impact on public health and the environment [1]. Medium to long term actions deal with the problem of reducing the average air pollution and include measures such as public traffic promotion and new transport technologies support [5] This concern for air quality has raised the interest on urban railways, to improve the public transport service, and for electric vehicles (EVs), to reduce the impact of road traffic. Rome Sapienza have been performing collaborative research on the use of regenerative energy from urban railways Both groups have made proposals to connect EVs and urban trains. As a result of this collaboration, a simulation study was developed to analyse and compare the potential braking energy that can be used to charge EVs batteries in different urban railway lines.
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