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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
close main section General criteria
  close sub-section Status of development: research & experiments
    (no details available)
  Time horizon for broad application: 5 - 10 years
    (no details available)
  Expected technological development: highly dynamic
    Technological developments will come mainly from storage technologies (cf. fly-wheel, double-layer capacitors, batteries and SMES).
    Motivation:
    Energy savings
  Benefits (other than environmental): medium
   

Peak load levelling

The load peaks of the supply system are equalized and thus reduced, which improves voltage stability.

Energy price

Furthermore reduced peak demands save energy costs since peak load energy is especially expensive.
  Barriers: (no data)
   

Technological

Storage technologies are starting to become a mature technology but lifespan is often still a problem.

Vehicle mass

Storage system increases vehicle mass.

Costs

High investment costs and long payback periods.

Complexity

Operators are reluctant to buy trains with higher complexity, since this could decrease availability and reliability and always requires additional know-how.
    Success factors:
    (no details available)
  Applicability for railway segments: medium
    Type of traction:  electric - DC
    Type of transportation:  passenger - regional lines, passenger - suburban lines
    It is evident, that energy storage shows best benefits and payback for local and regional trains with frequent stops (many storage cycles!). In AC systems on-board energy storage is possible as well but usually not attractive since feedback into supply system is much more effective than in DC systems. An exception could be some regional AC networks with frequent stops but low train density.
    Grade of diffusion into railway markets:
  Diffusion into relevant segment of fleet: 0 %
  Share of newly purchased stock: 0 %
    (no details available)
  Market potential (railways): low
    (no details available)
    Example:
   

 
open main section Environmental criteria
open main section Economic criteria
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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