Fuel cell system and operating method of fuel cell system

Abstract

The present invention provides a system for a fuel cell vehicle, capable of preventing an unnecessary error in calculating high potential avoidance power to calculate power for high potential avoidance with high accuracy. A fuel cell systemincludes: a fuel cellthat receives the supply of reactant gas to generate power; a secondary batteryfor storing part of the power generated by the fuel cell; calculation meanswhich, when surplus power for high potential avoidance is added to the output voltage of the fuel cellto avoid a high potential, calculates high potential avoidance voltage to avoid the high potential by feedback control based on a deviation between power generation voltage of the fuel celland high potential avoidance target voltage; determination meansfor determining whether the operating state of the fuel cellcorresponds to a prohibition condition A to prohibit updating of an integral term of the feedback control or a permission condition; and feedback control condition deciding meansfor stopping the updating of the integral term when the operating state corresponds to the prohibition condition A or updating the integral term when the operating state corresponds to the permission condition.