Power supply system of an electrically powered vehicle

A hybrid vehicle (1000) can (MG2) driving, using the output of an engine (115) and a second motor generator. A first motor generator (MG1), using the output of the motor (115) during the vehicle motion or while the vehicle stops, electric power for charging a plurality of DC power sources (10a, 10b) produce. A power supply system (5) includes a power converter of the DC power source via the (10a, 10b) and an electric power line common to the first and second motor generators (MG1, MG2), respectively. A controller 40 generates operation commands for the first and second motor generators (MG1, MG2) and the motor (115) to provide a travel request power based on the vehicle running condition and the charging / Entladeanforderungsleistung for the DC power sources (10a, 10b) as a whole sure. The setting of the charge / Entladeanforderungsleistung is switched according to a mode of operation of the power converter.