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Electric railway vehicles have come to use regenerative brake for normal operation from the top speed to almost zero speed. In the regenerative brake, the terminal voltage of traction motor cannot be increased due to the limited catenary voltage and blocking voltage of semiconductor devices. Therefore, the electrical brake force in the high-speed is smaller than that for middle or low speed. The total brake force for high-speed range mainly depends on the mechanical brake.By inserting resisters between the inverter and traction motor, the regenerative brake force can be increased in the high-speed range without increase of the rated power or current of inverter.In light-density line sections, regenerative brake force is frequently inactivated under light-load condition. In this condition, rheostats consume part of regenerative power generated by traction motors when the electric vehicle is braking. Then, the peak regenerative power for the feeder line will be decreased and electrical brake is easily activated, which is another merit.We studied the possibility to increase the regenerative brake force in the high-speed range by considering characteristic curves, RMS current, and regeneration rates.

Electric Brake Force Increase of Regenerative Brake in the High-Speed Range by Inserted Rheostats