FUEL CELL SYSTEM AND METHOD OF CONTROLLING FUEL CELL

The present invention relates to a fuel cell system and a method for controlling a fuel cell which ensure accurate feedback control of the opening degree of a pressure regulating valve and the opening degree of a bypass valve. A fuel cell system (1) is provided with an air inflow passage (21), a fuel cell (10) provided with an air passage (10a), an air outflow passage (23), a compressor (22), a pressure regulating valve (24), a bypass passage (27), and a bypass valve (28). A first threshold value is calculated on the basis of the FC inlet pressure lower limit value, and when it is determined that the FC inlet pressure command value is lower than the first threshold value and the FC pressure loss lower limit value is greater than the bypass pressure loss lower limit value, feedback control of the opening degree of the pressure regulating valve is stopped without stopping feedback control of the opening degree of the bypass valve, and feedback control of the opening degree of the pressure regulating valve is st