Gas turbine plant

A gas turbine plant comprising:

• a compressor including a compressor low-pressure stage for compressing air, and a compressor high-pressure stage for further compressing the air compressed at the compressor low-pressure stage;
• a combustor configured to mix and combust the air compressed by the compressor and fuel;
• a turbine configured to be driven by combustion gas generated in the combustor;
• a connection line configured to connect an outlet of the compressor high-pressure stage and an inlet of the turbine via the combustor;
• a bypass line configured to cause some or all of the air compressed at the compressor low-pressure stage to bypass the compressor high-pressure stage and to be supplied to the connection line;
• and
• an adjustment device configured to adjust a flow rate of the air flowing through the bypass line, wherein
• a plurality of types of fluid are supplied to the connection line in addition to the air compressed by the compressor, and
• during operation of the gas turbine plant, supply of at least one type of fluid of the plurality of types of fluid to the connection line is stopped according to an operating state of the gas turbine plant.