Design of Energy Storage Systems by Optimization Applied to Hybrid Electric Locomotive

Due to its railroad activities, the SNCF (French National Railway Company) tries to anticipate oil rarefaction and to improve its commitment in environment protection. Thus, one of its research programs in energetic deals with the hybridization of the diesel-electric railway traction. The identified problematic corresponds to the design of a multi-source and multi-storage system. To solve this problematic, a design tool by optimization of the hybrid system is presented. The models of each energetic elements and the energy management strategy based on filter method are implemented in CADES environment. The optimal formulation to design the hybrid electric locomotive is presented. A discussion on the importance of selecting the variables to be contained in the optimization, at the modeling lever rather than the optimization is presented. Finally, results for a shunting railway application are proposed and discussed.