Fuel cell system and control method for fuel cell system

A fuel cell system for generating power by supplying anode gas and cathode gas to a fuel cell, comprising:

• a compressor for supplying the cathode gas to the fuel cell;
• an anode gas discharge system for discharging anode off-gas discharged from the fuel cell into a cathode gas flow passage;
• a programmable pulsating operation control unit programmed to cause a pressure of the anode gas to pulsate based on an operating state of the fuel cell;
• a programmable purge control unit programmed to purge the anode off-gas into the cathode gas flow passage based on an impurity concentration of an anode of the fuel cell and calculating a purge flow rate based on the impurity concentration of the anode of the fuel cell and a pressure of the anode;
• and
• a programmable compressor control unit programmed to control the compressor based on the purge flow rate calculated by the programmable purge control unit,
• wherein the programmable purge control unit is further programmed to set the pressure of the anode to a predetermined value determined according to a pulsating state of the anode gas to suppress beat noise of the compressor due to the pulsation of the anode gas.