Abstract
The present work evaluates the application of regenerative braking for energy recovery in diesel-electric freight trains to increase efficiency and to improve decarbonization. The energy from regenerative braking has to be stored onboard when the track is not electrified. Different technologies of energy recovery are presented and discussed. The energy balance of an existing route is presented and simulated for different battery sizes. The analysis is illustrated with experimental data from an important Brazilian railway. Results show that the energy recovery from regenerative brake is a feasible investment and may be recommended to increase the efficiency in transportation and also to improve the low carbon mobility in railway systems.
Highlights
The use of railway systems in the transport sector presents advantages relative to other systems regarding energy efficiency, environmental impact, reliability, security and economic feasibility [1,2].Railways present some common characteristics
The Lithium Titanium Oxide (LTO) batteries selected as the technology to this present application have been used in distribution and transmission power systems, or grid-scale and railway transportation system applications
This paper presented a preliminary analysis of a storage system to recover energy from regenerative braking considering diesel-electric freight trains in non-electrified railways
Summary
The use of railway systems in the transport sector presents advantages relative to other systems regarding energy efficiency, environmental impact, reliability, security and economic feasibility [1,2].Railways present some common characteristics. The friction coefficient is very low resulting in low friction. The track gradient has to be very gentile due to the low friction coefficient. New infrastructure comprising electrification, improved operation through the optimization of timetables for maximizing the use of the regenerated energy [4], as well as storage devices [5] are ways of increasing the transport efficiency of a railway system. Regenerative braking is an interesting technology to increase efficiency [6,7], consisting of inverting the propulsion machine functioning mode from motor to generator. It is feasible for locomotives with electric traction motors, both electric and diesel-electric
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