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Sizing and Energy Management of a Hybrid Locomotive Based on Flywheel and Accumulators

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5 Author(s)
Jaafar, A. ; Inst. Nat. Polytech. de Toulouse, Univ. de Toulouse, Toulouse, France ; Akli, C.R. ; Sareni, B. ; Roboam, X.
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The French National Railways Company (SNCF) is interested in the design of a hybrid locomotive based on various storage devices (accumulator, flywheel, and ultracapacitor) and fed by a diesel generator. This paper particularly deals with the integration of a flywheel device as a storage element with a reduced-power diesel generator and accumulators on the hybrid locomotive. First, a power flow model of energy-storage elements (flywheel and accumulator) is developed to achieve the design of the whole traction system. Then, two energy-management strategies based on a frequency approach are proposed. The first strategy led us to a bad exploitation of the flywheel, whereas the second strategy provides an optimal sizing of the storage device. Finally, a comparative study of the proposed structure with a flywheel and the existing structure of the locomotive (diesel generator, accumulators, and ultracapacitors) is presented.

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Vehicular Technology, IEEE Transactions on  (Volume:58 ,  Issue: 8 )