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   On-board energy storage in DC systems  evaluated  
Modern energy storage devices permit the storage of braking energy on-board for use in subsequent acceleration phases. Especially in DC system, where energy losses in the distribution network are high, this could be an interesting alternative to feeding back energy into the supply system. Furthermore reduced peak load is beneficial for system capacity, voltage stability and energy costs.
Technology field: Regenerative braking and energy management
open main section General information
open main section General criteria
open main section Environmental criteria
close main section Economic criteria
  close sub-section Vehicle - fix costs: high
    Investment costs depend on the storage technology and the system layout chosen but are generally high.
  Vehicle - running costs: significant reduction
    The (relative) savings in energy costs are higher than the (relative) energy savings themselves since the equalizing of the load peaks substantially cuts the energy price (which is determined by peak demands).
  Infrastructure - fix costs: none
    (no details available)
  Infrastructure - running costs: unchanged
    (no details available)
  Scale effects: high
    Scale effects for storage technologies.
  Amortisation: 2 - 5 years
   

Amortisation of energy storage systems is in the range of 10 to 30% of the vehicle lifetime, that is 3 to 10 years, depending on the vehcile and the storage type. It could be appreciably reduced by scale effects.

In many cases, amortisation is more favourable for stationary storage.
no data available Application outside railway sector (this technology is railway specific)
open main section Overall rating
References / Links:  Hentschel et al. 2000
Attachments:
Related projects:  Studies performed on energy storage systems;  THALES: hybrid tram train with on-board ultracapacitors
Contact persons:
 date created: 2002-10-09
 
 
© UIC - International Union of Railways 2003
 
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