A basic simulation of the longitudinal dynamics of parallel hybrid railway vehicles is presented, which is used for an optimization of the operating strategy. An internal combustion engine, the primary power source, is supported by an electrical energy storage system with motor and generator allowing for joint usage of both energy sources. For the main components of the power train, interface variables representing power flow and energy, are defined. A combined quadratic performance index is introduced for a system optimization. Here, an optimization of fuel consumption and emissions is considered for a parallel hybrid structure to minimize the chosen performance index. A mathematical modeling for a basic parallel hybrid structure, with calculation performed in backward direction, has been presented. The simulations were performed for a parallel hybrid structure with a specified duty cycle. By minimization of an appropriate performance index, an optimized operating strategy was found. The simulation and optimization results show a reduction of fuel consumption of about 17% for a fixed duty cycle.
Simulation and optimization of the longitudinal dynamics of parallel hybrid railway vehicles
Simulation und Optimierung der longitudinalen Dynamik von Hybrid-Eisenbahnfahrzeugen
2011
10 Seiten, 5 Bilder, 1 Tabelle, 4 Quellen
Aufsatz (Konferenz)
Englisch
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