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   Inverter unit for DC substations  evaluated  
By installing thyristor inverters in substations of DC systems, a feeding back of recovered braking energy into the public mains becomes a possibility. This can considerably increase recuperation rates in suburban or regional DC systems.
Technology field: Regenerative braking and energy management
close main section General information
  open sub-section Description
close main section General criteria
  open sub-section Status of development: in use
  Time horizon for broad application: 5 - 10 years
  Expected technological development: (no data)
  Benefits (other than environmental): none
  Barriers: high
  Applicability for railway segments: low
    Type of traction:  electric - DC
    Type of transportation:  passenger - regional lines, passenger - suburban lines
    Grade of diffusion into railway markets:
  Diffusion into relevant segment of fleet: < 5%
  Share of newly purchased stock: not applicable
  Market potential (railways): low
close main section Environmental criteria
  open sub-section Impacts on energy efficiency:
  Energy efficiency potential for single vehicle: 2 - 5%
  Energy efficiency potential throughout fleet: < 1%
  Other environmental impacts: neutral
close main section Economic criteria
  open sub-section Vehicle - fix costs: none
  Vehicle - running costs: significant reduction
  Infrastructure - fix costs: high
  Infrastructure - running costs: increased
  Scale effects: medium
  Amortisation: > 5 years
no data available Application outside railway sector (this technology is railway specific)
close main section Overall rating
  open sub-section Overall potential: promising
  Time horizon: mid-term
References / Links:  Moninger, Gunselmann 1998;  Piro (no year);  Moninger (no year)
Related projects:
Contact persons:
 date created: 2002-10-09
© UIC - International Union of Railways 2003
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