Abstract
This paper deals with the energy recovery resulting from the braking transient of trains arriving in a railway station, to feed a railway micro-grid that would be purposely connected to the railway traction circuit to feed the electrical infrastructure required for charging a fleet of electrical vehicles that are parked nearby the station and offered for providing train plus electric vehicle integrated mobility. Based on results of an experimental campaign intended to recording the mechanical quantities related to the braking transient of regional trains arriving in a medium-size station of the Italian railways network, this paper describes a suitable quasi-stationary model that allows the evaluation of the amount of energy that is recoverable over each single day of operation, as well as the micro-grid dynamic electric behaviour due to the sudden energy recovery transient in the railway catenary. The proposed railway micro-grid is discussed, particularly concerning the configuration of the dual-active-bridge converter for regulating the power flow from the railway catenary to the micro-grid during an energy recovery transient, as well as by considering the DC-DC converter that is used in the micro-grid, together with battery storage to provide voltage stability according to the micro-grid operating condition.
Highlights
Received: 24 December 2021Nowadays, climate change is one of the most current and growing interest issues, and it is widely recognised that the transport sector significantly contributes to environmental pollution and the greenhouse gases production [1]
The study considers the experimental traces achieved achieved from either braking or accelerating transients of trainsets either arriving or defrom either braking or accelerating transients of trainsets either arriving or departing parting daily at the Imola train station to evaluate the overall amount of energy that is daily at the Imola train station to evaluate the overall amount of energy that is available to be recovered along a single day of traffic operation
Starting from the experimental data that became available as the follow up of an extensive recording campaign that the railway operator carried out on board regional service trains being operate with E.464 locomotives, the study has considered the experimental traces achieved from either braking or accelerating transients of trainsets either arriving or departing daily at a reference railway station, in order to evaluate the overall amount of energy that is available to be recovered along a single day of traffic operation
Summary
Climate change is one of the most current and growing interest issues, and it is widely recognised that the transport sector significantly contributes to environmental pollution and the greenhouse gases production [1]. This paper deals with the railway micro-grid briefly depicted above to the goal of discussing the dynamic behaviour resulting from recovering the braking energy related to the train traffic in the railways station, as well as for providing an insight into the various power electronics apparatus that are required to arrange the micro-grid’s overall configuration. Conclusions are developed to summarise results and to indicate issues for further investigation concerning power flows in the proposed railway micro-grid, including the possibility that such a micro-grid is used to provide voltage and/or frequency regulation services to the DSO. Section this paper in order to discuss all the available solutions for recovering energy ergy in 2a of micro-grid that is purposely connected to the railway traction circuit.
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