Patent ID: 7047747

Claim:
A gas turbine fuel control method of controlling a lift amount of a pressure control valve provided at a piping in which fuel for a gas turbine flows, by feeding back an actually obtained differential pressure across a flow rate control valve also provided at the piping to the pressure control valve and making the differential pressure follow a desired target value of the differential pressure, the gas turbine fuel control method comprising: expressing a conductance of the pressure control valve using a pressure used to supply fuel gas that is detected upstream of the pressure control valve at the piping, a pressure in a combustor casing of the gas turbine, an output of a generator connected to the gas turbine, and a controlled output for the flow rate control valve that is calculated based on a difference between an output target value of the generator and an actual output of the generator; obtaining an additional lift amount of the pressure control valve from a relationship between the conductance of the pressure control valve and lift; and adding the additional lift amount to the lift amount.