Voltage fluctuations caused by output fluctuations of renewable energies are becoming an issue where a large amount of renewable energies interconnect to a localized area. We have developed a reactive power control system which calculates reactive power command in order to suppress voltage fluctuations in a localized area utilizing a reactive power output function of a large-capacity battery system installed in Minami-Soma substation. The system has started operation in February 2016. Verification results of the system which have been reported in workshops are summarized.
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