RESEARCH PAPERS: Transportation Papers

Optimal Control of On-Board and Station Flywheel Storage for Rail Transit Systems

[+] Author and Article Information
L. M. Sweet

Transportation Program, Mechanical and Aerospace Engineering, Princeton University, Princeton, N.J. 08540

M. J. Keane

Mechanical and Aerospace Engineering, Princeton University, Princeton, N.J. 08540

J. Dyn. Sys., Meas., Control 100(4), 284-290 (Dec 01, 1978) (7 pages) doi:10.1115/1.3426379 History: Received October 18, 1978; Online July 13, 2010


The energy efficiency of rail transit systems using regenerative braking is enhanced by flywheel storage elements used to store energy not accepted by the wayside power rail. In this paper three storage system control concepts are examined: armature and field control of on-board flywheels, and field control of a station-based storage device. The energy recovery efficiency and performance characteristics of each system are determined subject to optimal control laws derived to minimize energy loss. The resulting control systems are bilinear, due to the use of separately excited DC traction and flywheel motors as continuously variable transmissions. The three systems yield similar energy recovery efficiencies for deceleration, with the advantages of each for practical applications discussed.

Copyright © 1978 by ASME
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