Active Regenerative Braking: Braking of Induction Machine Traction Drive with Maximum Torque in High Speeds

This paper deals with the problem of the transmission of the energy to the dc trolley wire during the regenerative braking of the tram drive in case of the braking with increased dc-link voltage. The contribution presents new strategy called "active regenerative braking" (ARB). When the dc trolley wire is able to receive at least minimum energy, ARB allows the transmission of the vehicle kinetic energy to the trolley wire, even if the dc-link voltage is higher than admissible upper trolley wire voltage. The proposed strategy is verified by simulations and experimental data from the recent tram ¿koda 14T, where this system is first time used.