A power system for a railway vehicle has one or more on-board generator units (GUs) 1 which generate electrical power from fuel combustion or oxidation; one or more on-board energy storage systems (OBESSs) 2; one or more first traction motors 4A that drive the vehicle using electrical power generated by the GUs; and one or more second traction motors 4B that drive the vehicle using power from the OBESSs. A control sub-system 11 selectively controls the amount of electrical power generated by the GUs and outputted by the OBESSs. The control sub-system also provides an extended operational mode which increases the respective states of charge of the OBESSs by operating the second traction motor(s) as generators to perform regenerative braking while simultaneously operating the GUs to generate electrical power in excess of that needed to drive the vehicle using the first traction motors. The excess electrical power is converted into kinetic energy of the vehicle and then reconverted, by regenerative braking, into regenerated electrical power which is stored by the OBESSs. In a separate embodiment, the control sub-system controls performance of: regenerative braking, where power generated by a first portion of the traction motors is stored by the OBESSs; rheostatic braking, in which kinetic energy of the vehicle is converted into dissipated heat in brake grid resistors by generator operation of a second portion of the traction motors; and friction braking. On braking the vehicle, the control sub-system prioritises regenerative braking, followed by rheostatic braking, then friction braking.
Power system for a railway vehicle
2021-11-17
Patent
Elektronische Ressource
Englisch
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