Patent ID: 8776528

Claim:
A method for operating a gas turbine plant which is supplied with a fuel gas via a compressor station, wherein the compressor station includes a compressor which compresses the fuel gas which is fed via a gas feed line and delivers it via at least one control valve to a combustion chamber of the gas turbine plant, and a bypass system is arranged in parallel to the compressor via which fuel gas can be directed in a switchable manner past the compressor to the at least one control valve, the method comprising: measuring continuously the fuel gas pressure at an outlet of the at least one control valve; determining for each valve a minimum fuel gas pressure, for operation of the gas turbine, at an inlet of the at least one control valve from the measured fuel gas pressure; switching over the compressor station to a bypass operation if the fuel gas pressure which reaches the inlet of the at least one control valve via the bypass system is greater than or equal to the minimum fuel gas pressure; wherein the minimum fuel gas pressure for operation of the gas turbine is determined in each case by multiplying the fuel gas pressure at the outlet of the at least one control valve by a factor ( 1 1 - α min ) , wherein ∝ min is a number between 0 and 1; and wherein the factor is determined by means of the constant ratio of minimum pressure drop across the control valve to the fuel gas pressure at the inlet of the control valve.