Patent ID: 8739551

Claim:
A method for operating a gas turbine having a compressor and combustion chamber, comprising: controlling the gas turbine using a compressor discharge pressure as a control variable; specifying a maximum rate of a change of a compressor discharge pressure; measuring the compressor discharge pressure using a pressure sensor disposed at an exit of the compressor; and limiting a rate of change of the compressor discharge pressure to the maximum rate of change, wherein the compressor comprises a plurality of variable inlet guide vanes and the compressor discharge pressure is controlled by changing positions of the inlet guide vanes when the rate of change of the compressor discharge pressure reaches the maximum rate of change, wherein air is extracted at an exit of the compressor, wherein the extracted air is fed to an air-separation plant, and wherein by controlling the compressor discharge pressure at the exit of the compressor, instabilities in the gas turbine due to severe pressure fluctuations from an interaction between the air coming from inside the gas turbine and that of a volume of the air extracted inside a tube leading to the air-separation plant are avoided, and the air-separation plant extracts a required mass flow.