Guiding the Selection and Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities (2010) / Chapter Skim
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From page 12... ...
Guiding the Selection & Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities Transit Cooperative Research Program Transportation Research Board Page 10 of 61 Discussions in following sections analyze these problem areas in addition to the use of energy storage devices to replace conventional electrical power substations and reduce peak power demand. 4 Transit Agency Needs Assessment To focus the investigation on the potential benefits of storage and select appropriate transit system designs for computer simulation, the study team interviewed various U.S.
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From page 13... ...
Guiding the Selection & Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities Transit Cooperative Research Program Transportation Research Board Page 11 of 61 Power and energy can be viewed as characteristics that depict the rate of energy delivery and the amount of energy stored, respectively. Some devices store large amounts of energy efficiently but may be unable to charge or discharge this energy over a short time span.
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Guiding the Selection & Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities Transit Cooperative Research Program Transportation Research Board Page 12 of 61 Table 4-1 Energy storage application by mode and transit property Energy Storage Application Agency Rail Mode Location B ra ki ng En er gy R ec ap tu re Po w er Q ua lit y – V ol ta ge S ag Pe ak P ow er R ed uc tio n En er gy St or ag e Su bs ta tio n Comments Los Angeles County Metropolitan Transportation Authority Light Rail Los Angeles, California Yes Yes Yes Yes LACMTA expansion is considering utilizing energy storage to reduce number of power substations. LACMTA also won a large TIGGER grant to evaluate energy saving technologies including energy storage.
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Guiding the Selection & Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities Transit Cooperative Research Program Transportation Research Board Page 13 of 61 Figure 4-1: Ragone Chart for energy storage device Figure 4-2: Sustainable discharge rate for energy capacity 4.1 Vendor data summary Detailed information on specific energy storage device operational data for use in subsequent computer modeling was obtained from energy storage vendors participating in the APTA/EPRI Energy Storage Research Consortium. Figures 4–3 through 4–5 summarize the variation in performance measures as a function of energy and power availability, discharge and charge times, and number of charging cycles capable over the life of the device.
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From page 16... ...
Guiding the Selection & Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities Transit Cooperative Research Program Transportation Research Board Page 14 of 61 Energy/Power Chart Based on Vendor Data 1 10 100 1,000 10,000 100 1,000 10,000 Power (kW)
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