Power supply system

A power supply system comprises a battery which can be charged/discharged, a charging/discharging apparatus which charges/discharges the battery, and a charging/discharging power limit controller which outputs a charging/discharging power limit control signal obtained by amplifying a deviation between an output voltage command signal of the battery and a detected output voltage signal obtained by detecting an output voltage of the battery, wherein and the charging/discharging apparatus includes a charging/discharging controller which controls of charging/discharging power of the battery based on the charging/discharging power limit control signal.