Patent ID: 7952224

Claim:
A power supply system capable of supplying and receiving electric power to and from a load device, comprising: a plurality of chargeable power storage devices; an electric power line for supplying and receiving electric power between the power supply system and said load device; a plurality of converters provided in association with said plurality of power storage devices and each performing voltage conversion between an associated power storage device and said electric power line; and a control device controlling said plurality of converters, said control device including: a share ratio calculation unit performing at least one of a first calculation to determine a discharge power share ratio between respective electric powers to be discharged from said plurality of power storage devices, and a second calculation to determine a charge power share ratio between respective electric powers to be used for charging said plurality of power storage devices; and a converter control unit performing at least one of a first control to control said plurality of converters according to said discharge power share ratio when electric power is supplied from the power supply system to said load device, and a second control to control said plurality of converters according to said charge power share ratio when electric power is supplied from said load device to the power supply system, wherein said first calculation is performed to determine, for each of said plurality of power storage devices, a remaining electric power quantity before a state of charge is reached with respect to which an allowable discharge electric power representing a maximum value of electric power that can be instantaneously output is restricted, and determine said discharge power share ratio according to a ratio of said remaining electric power quantity between said plurality of power storage devices, and said second calculation is performed to determine, for each of said plurality of power storage devices, a chargeable quantity before a state of charge is reached with respect to which an allowable charge electric power representing a maximum value of electric power that can be instantaneously input is restricted, and determine said charge power share ratio according to a ratio of said chargeable quantity between said plurality of power storage devices.