Energy Storage Devices in Hybrid Railway Vehicles: A Kinematic Analysis

This paper analyzes the potential benefits of hybridization for rail vehicles, allowing the railway industry to offer modal competitive, cost-effective and energy efficient traction solutions. Hybridization is seen as potentially capable of providing an extra step in energy efficiency that goes beyond the usual alternative -- providing traction via diesel fuel combustion -- used on non-electrified routes where electrification is considered to be economically infeasible. The research uses a rail vehicle simulator, which has been developed to compute the drive train duty cycle typically seen in high-speed and commuter passenger services. Simulator output is placed into a series hybrid model that is optimized to preserve the charge state of the energy storage device, as used in a typical rail journey. Results show an energy savings of up to 28 % for high-speed intercity vehicles. Energy savings of 35 % for commuter vehicles are achievable using practical system components. The research also includes sensitivity analysis that examines the effect of the inherent efficiency of the regenerative braking capability and the energy storage device. Results here show that primary energy savings are realized only when in/out storage efficiencies are greater than 40 %.


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  • Accession Number: 01051747
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 3 2007 8:07PM