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In this paper, concerned with an energy storage system (ESS) with Li-ion battery for DC traction power system, a study about planning of introducing ESS and the performances of two examples in actual operation are described. Through this study, a suitable condition for introducing ESS with respect to headway of trains was obtained and confirmed by analysis measurements. Further, the effects of adjusting threshold voltages of charge and discharge on the practical use of ESS are also described.

In this paper, some application examples of energy saving measures in two representative Japanese railway companies, mainly in d.c. electric traction power supply system, are introduced. The effect of electric energy storage systems installed to substations is mentioned especially. In addition, it is also described about the potential of regenerative braking energy, which will be able to be utilized by installation of energy storage systems or other measures.

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