Nowadays, in several European Railway networks, the old DC supply systems are severely limited by line-voltage drops. In some sectors, it is not possible to increase traffic or to operate locomotives at their nominal ratings. To increase the capacity of a DC supply system, without additional substations, the authors propose a new three-wire supply system which restores the overhead line voltage with multilevel DC choppers operating as voltage boosters. Circuits using a third wire with a negative or a positive polarity are considered and compared. Case studies are presented for the French and Italian rail networks. Finally, experimental results performed on a test platform of the French railways, are presented in the case of a double 1.5 kV supply system.
New three-wire supply systems for DC electric railways
IET Electrical Systems in Transportation ; 5 , 3 ; 112-119
2015-09-01
8 pages
Article (Journal)
Electronic Resource
English
multilevel DC choppers , double supply system , overhead line voltage restoration , DC supply systems , DC electric railways , line-voltage drops , French railway test platform , railway electrification , choppers (circuits) , substations , positive polarity , Italian rail networks , voltage boosters , negative polarity , power 1.5 kW , European railway networks , power overhead lines , three-wire supply systems , rail traffic
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