Patent ID: 6907722

Claim:
A gas compressor control device for exercising opening control of a recycle valve interposed in a recycle pipe which returns a fuel gas from an outlet of a gas compressor to an inlet of said gas compressor, and opening control of an inlet guide vane provided in said gas compressor, said gas compressor control device comprising: a computing capability unit for computing a recycle valve normal opening command (r 1 ) and an inlet guide vane normal opening command (i 1 ) based on a deviation between a fuel gas pressure (P 1 ) at said gas compressor outlet and a preset fuel gas supply pressure set value (P 0 ); and a computing capability unit for computing a recycle valve preceding opening command (r 2 ) and an inlet guide vane preceding opening command (i 2 ) based on a deviation between an actual generator output (W 1 ), which is an actual output of a generator rotationally driven by a gas turbine supplied with the fuel gas from said gas compressor, and a first order lag actual generator output (W 1 ′), which has been obtained by first order lag computation of said actual generator output (W 1 ), and said gas compressor control device exercising: during a normal operation, opening control of said recycle valve based on a value of said recycle valve normal opening command (r 1 ), and opening control of said inlet guide vane based on a value of said inlet guide vane normal opening command (i 1 ); and in an event of a sudden load fall, opening control of said recycle valve based on a value obtained by adding said recycle valve preceding opening command (r 2 ) to said recycle valve normal opening command (r 1 ), and opening control of said inlet guide vane based on a value obtained by adding said inlet guide vane preceding opening command (i 2 ) to said inlet guide vane normal opening command (i 1 ).