Fuel cell system and method of controlling same

A method of controlling a fuel cell system, the method comprising:

• deriving, by a controller of a fuel cell system, an error value based on a difference between a condensate water production amount and a condensate water discharge amount of an anode of a fuel cell stack when a discharge valve is in an open state,
• wherein the fuel cell system comprises:
• the discharge valve configured to adjust a flow rate between an inlet and an outlet,
• wherein the discharge valve is connected:
• at the inlet to a water trap connected to the anode of the fuel cell stack, and
• at the outlet to an external exhaust line;
• and
• the controller configured to:
• derive the error value on based on the difference between the condensate water production amount and the condensate water discharge amount of the anode of the fuel cell stack when the discharge valve is in the open state;
• correct the condensate water production amount of the anode based on an error value when the discharge valve is in a closed state, generating a corrected condensate water production amount;
• and
• open the discharge valve when the corrected condensate water production amount exceeds a predetermined first reference value;
• correcting, by the controller, the condensate water production amount of the anode based on the error value when the discharge valve is in the closed state;
• and
• opening, by the controller, the discharge valve when the corrected condensate water production amount exceeds the predetermined first reference value.