TY - GEN
T1 - Technology for energy-saving railway operation through power-limiting brakes - A case study at an urban railway
AU - Koseki, Takafumi
AU - Watanabe, Shoichiro
AU - Hamazaki, Yasuhiro
AU - Kondo, Keiichiro
AU - Hasegawa, Tomonori
AU - Mizuma, Takeshi
PY - 2014
Y1 - 2014
N2 - An appropriate driver-assistance in order to use regenerative braking effectively is significant as a feasible method of a smart power management for energy-saving and economical solutions in sustainable electric railway operation. It is substantially significant to suppress braking force in high speed so that the braking force is less than corresponding traction force in the field-weakening speed region so that the whole braking force can be supplied by the regenerative electric brakes without active use of ordinary mechanical brakes. This power limitation in high speed is also beneficial to reduce the probability of regenerative braking cancellation caused by occasional high voltage at pantographs. If one limit the braking force, the total traveling time is increased, but this supplemental running time is relatively small, when the limitation of the deceleration is only applied in high speed and this supplemental time can be absorbed in realistic time margin, which is the difference of the initially scheduled conservative running time and actual one. Authors propose this type of the fully used electric braking pattern as 'constant-power braking'or 'power-limiting braking'and for realistic application to existing rolling stocks, they also propose a minor variation called as discrete approximate constant-power electric braking. The train driver must start braking operation considerably earlier than conventional ordinary train operation, and the braking force must be precisely controlled depending on the actual train speed timely. Since this driving method is, therefore, inherently more complicated than conventional one, a smart onboard driver-assistance or automatic train stopping control is requested for the realization.
AB - An appropriate driver-assistance in order to use regenerative braking effectively is significant as a feasible method of a smart power management for energy-saving and economical solutions in sustainable electric railway operation. It is substantially significant to suppress braking force in high speed so that the braking force is less than corresponding traction force in the field-weakening speed region so that the whole braking force can be supplied by the regenerative electric brakes without active use of ordinary mechanical brakes. This power limitation in high speed is also beneficial to reduce the probability of regenerative braking cancellation caused by occasional high voltage at pantographs. If one limit the braking force, the total traveling time is increased, but this supplemental running time is relatively small, when the limitation of the deceleration is only applied in high speed and this supplemental time can be absorbed in realistic time margin, which is the difference of the initially scheduled conservative running time and actual one. Authors propose this type of the fully used electric braking pattern as 'constant-power braking'or 'power-limiting braking'and for realistic application to existing rolling stocks, they also propose a minor variation called as discrete approximate constant-power electric braking. The train driver must start braking operation considerably earlier than conventional ordinary train operation, and the braking force must be precisely controlled depending on the actual train speed timely. Since this driving method is, therefore, inherently more complicated than conventional one, a smart onboard driver-assistance or automatic train stopping control is requested for the realization.
KW - assistance
KW - electric railway
KW - energy-saving train operation
KW - regenerative brake
UR - http://www.scopus.com/inward/record.url?scp=84906689746&partnerID=8YFLogxK
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U2 - 10.1109/IPEC.2014.6869882
DO - 10.1109/IPEC.2014.6869882
M3 - Conference contribution
AN - SCOPUS:84906689746
SN - 9781479927050
T3 - 2014 International Power Electronics Conference, IPEC-Hiroshima - ECCE Asia 2014
SP - 2126
EP - 2132
BT - 2014 International Power Electronics Conference, IPEC-Hiroshima - ECCE Asia 2014
PB - IEEE Computer Society
T2 - 7th International Power Electronics Conference, IPEC-Hiroshima - ECCE Asia 2014
Y2 - 18 May 2014 through 21 May 2014
ER -