A 2MW Battery Power System (BPS) was installed and tested in a traction power substation on the Orange Line of the Washington Metropolitan Area Transit Authority (WMATA), as a demonstration project. Measurement data were obtained under normal revenue service conditions. In addition, the same installation was tested as an emergency power source to move trains to desired destinations when the traction power system was under a simulated blackout situation. The results were analyzed to assess the ability of the BPS installation to achieve energy saving, peak power reduction, train voltage support and emergency power provision. This paper describes the findings from this demonstration project and the follow-on efforts in WMATA.

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