Power supply system

A power supply system comprising:

• a converter unit including a plurality of converters connected in parallel and a current controller configured to balance output currents of the plurality of converters and to transform an input voltage and output the transformed voltage to a load;
• a power storage device connected in parallel to the converter unit relative to the load and configured to supply power to the load;
• a driving stop controller configured to deactivate one or more of the plurality of converters based on a load current and current output capabilities of the plurality of converters;
• and
• a driving start controller configured to start driving each deactivated converter,
• wherein the power storage device includes an output current value detector configured to obtain an output current value of the converter unit,
• wherein, when an output voltage of the power storage device becomes higher than an output voltage of the converter unit when the one or more of the plurality of converters are deactivated by the driving stop controller, the output voltage of the power storage device is supplied to the load, and
• wherein the driving start controller is configured to start driving one or more of each deactivated converter when the output current value obtained by the output current value detector is at or above a load factor of 50% with respect to a rated load of the converter unit.