Patent ID: 8826671

Claim:
A control system for a gas turbine power plant, the gas turbine power plant including: a compressor ( 1 ) that compresses combustion air; a water atomization cooling apparatus ( 3 ) that sprays water drops of atomized water supplied via a water atomization flow rate regulating valve ( 13 ) over a flow of air drawn in the compressor ( 1 ); a combustor ( 2 ) that includes a plurality of burners and fuel supply systems that supply fuel to each of the corresponding burners; mixes the compressed combustion air with fuel to thereby burn a fuel-air mixture and generate combustion gas at high temperature; and performs combustion switching which add the fuel supply systems to be used for distributing the fuel flow rate as the total fuel flow rate increases; a turbine ( 4 ) that uses the combustion gas to drive the compressor ( 1 ) and a generator; the water atomization flow rate regulating valve ( 13 ) that controls a flow rate of the atomized water; and a compressor inlet inner blade ( 11 ) that controls a flow rate of air drawn in the compressor ( 1 ), the control system comprising: a fuel flow rate control circuit ( 22 ) that calculates a fuel flow rate command value ( 32 ) to be applied to the combustor ( 2 ); and a controller ( 24 ) that calculates a fuel-air ratio correction command signal to compensate in advance for reduction in a fuel-air ratio occurring at the combustor ( 2 ) during the combustion switching and, based on the fuel-air ratio correction command signal, controls at least one of an opening amount of the compressor inlet inner blade ( 11 ) and an opening amount of the water atomization flow rate regulating valve ( 13 ) based on the fuel-air ratio correction command signal.