A power control system includes a battery, a converter which converts a direct-current voltage of the battery to a different level of direct-current voltage by the switching of switching elements, a second inverter, a second MG which is an electric motor, an engine, and an ECU which is a controller. When there is a warm-up request for the battery, the ECU causes a carrier frequency in the switching control of the switching elements to be lower than a carrier frequency in the case where there is no warm-up request for the battery. When there is a warm-up request, the ECU causes the carrier frequency at which the engine is in operation to be lower than the carrier frequency at which the engine is out of operation.