Fuel cell power generation system and method for operating the same

A method for operating a fuel cell power generation system,

• the fuel cell power generation system including:
• a fuel cell configured to generate electric power using a fuel gas supplied to an anode thereof and an oxidizing gas supplied to a cathode thereof;
• a fuel gas supply mechanism configured to supply the fuel gas to the anode;
• an oxidizing gas supply mechanism configured to supply the oxidizing gas to the cathode;
• an electric power output unit configured to supply the electric power generated by the fuel cell to an internal load and external load of the fuel cell system;
• and
• a cooling mechanism configured to cool the fuel cell,
• the method comprising:
• a first step of controlling the electric power supplied from the electric power output unit to at least one of the internal load and the external load such that a voltage of the fuel cell temporarily becomes equal to or higher than a first voltage by which a sulfur compound adhered to the cathode oxidizes;
• and
• a second step of causing the cooling mechanism to cool the fuel cell to condense steam in the fuel cell and stopping supplying the oxidizing gas from the oxidizing gas supply mechanism, the second step being carried out after the first step.