Power generation system and method of stopping power generation system

A power generation system comprising:

• a gas turbine including a compressor and a combustor;
• a fuel cell including an cathode and a anode;
• a first compressed oxidant supply line adapted to supply a compressed oxidant compressed by the compressor to the combustor;
• a second compressed oxidant supply line adapted to supply a part of the compressed oxidant compressed by the compressor to the cathode;
• a first fuel gas supply line adapted to supply a fuel gas to the combustor;
• a second fuel gas supply line adapted to supply a fuel gas to the anode;
• a fuel gas recirculation line adapted to return an exhausted fuel gas discharged from the anode to the anode;
• a cooler provided in the fuel gas recirculation line;
• and
• a control unit adapted to operate the cooler when the control unit has stopped the fuel cell and has cut the compressor and the second compressed oxidant supply line.