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Estimating the Ratio of Kinetic Energy Turned into Regenerated Electric Active Energy through Regenerative Braking by an Electric Locomotive

This paper presents a practical method which can be used to estimate the ratio of kinetic energy turned into regenerated electric active energy through regenerative braking by electric locomotives used to tract freight trains. An algorithm implemented in Matlab was conceived and used to process 2 types of data: static (tracted mass) and dynamic (altitudes, speeds and regenerated electric active energies). The dynamic input data were recorded by an onboard equipment every 5 minutes across the same route in a round trip, in order to diminish as much as possible, the influence of the route geographical characteristics. Because the train mass varied with the sense of travel, calculations were made separately for each sense, considering only motion points and 2 different thresholds for the altitude difference between adjacent points. Criteria used to filter the input data and respectively to reject deviant values were conceived and results are discussed.