This study examines the technical and economic aspects of a regenerative braking/flywheel energy storage subway system. In order to define the analytical models accurately, it was necessary to gather data on the trains, rail network, schedules, and ancillary equipment. Data on projected costs of flywheels, motors, rails, and other equipment were also gathered for use in the economic analysis. During this data gathering phase, it was decided that the Massachusetts Bay Transportation Authority (MBTA) Red Line would be the source of the most representative and complete data. The problem was to determine what, if any, combination of energy storage devices and high conductivity rails would yield a subway system with a lower life cycle cost. The primary goal of the study was to compare the system costs of wayside storage with those of on-board storage. Using data provided by MBTA, power levels vs. time and rail losses were calculated and used to determine the sizing and location of energy storage units. From the amounts of energy storage required, the costs of the flywheels and i/o equipment were calculated. Utilizing these modules for load leveling was also considered. However, since the energy storage required for load leveling is much greater than that required for regenerative braking, a separate study is needed to examine this in detail.

  • Corporate Authors:

    Draper (Charles Stark) Laboratory, Incorporated

    555 Technology Square
    Cambridge, MA  United States  02139

    Transportation Systems Center

    55 Broadway, Kendall Square
    Cambridge, MA  United States  02142

    National Science Foundation

    Office of Systems Integration and Analysis
    Washington, DC  United States  20550
  • Authors:
    • Eisenhaure, D
    • O'Dea, S
  • Publication Date: 1978-3

Media Info

  • Pagination: 47 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00181988
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: DOT-TSC-UMTA-77-53 Final Rpt.
  • Files: NTIS, TRIS
  • Created Date: Nov 14 1981 12:00AM