In order to use unutilized regenerative power effectively, we installed an energy storage system in Yasu sectioning post in March, 2018. We analyzed the data about the ESS performance from March to August 2018, and it was found that the regulative charging energy was influenced by the season, while the total charge and discharge energy was not strongly. In this study, we report the data about the ESS performance and the issue on operating the ESS effectively.
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