FUEL CELL SYSTEM AND METHOD FOR CONTROLLING FUEL CELL SYSTEM

A fuel cell system 100 includes a fuel cell 10 and a controller 20 that controls a voltage of the fuel cell 10. The controller 20 sets a target increase amount ”V, based on a target voltage which is a target value of voltage relative to a predetermined electric current of the fuel cell 10. The controller 20 sets a processing condition of a temporary voltage drop process, based on the target increase amount ”V. The controller 20 performs a temporary voltage drop process under the set processing condition. The temporary voltage drop process temporarily drops the voltage of the fuel cell 10 based on a power generation characteristic of the fuel cell 10, so as to cause a temporary increase in electric current of the fuel cell 10 and change the power generation characteristic of the fuel cell 10.