Fuel supply system, gas turbine, electricity generation plant, control method, and program

A control method for a fuel supply system including a fuel supply flow passage that includes a fuel gas heater which heats fuel of a gas turbine and supplies the fuel heated by the fuel gas heater to a first nozzle of a pilot system which supplies flames serving as pilot flames and a second nozzle of another fuel system, a bypass flow passage that connects to the pilot system and supplies the fuel to the first nozzle without passing through the fuel supply flow passage, and a bypass fuel flow rate adjusting valve that adjusts a flow rate of the fuel flowing in the bypass flow passage,

• wherein the bypass fuel flow rate adjusting valve is controlled from a closed state to an open state at the time of a decrease in load of the gas turbine.

(canceled)