Patent ID: 7877979

Claim:
An integrated gasification combined cycle plant comprising: a gasification unit; a combined power generation unit where gas produced by the gasification unit is used as fuel, and a gas turbine and a steam turbine are rotated using the fuel gas produced by the gasification unit to generate power; and a control system that performs a feed-forward control of the gasification unit to produce the fuel gas with a production rate required in the combined power generation unit according to a power load required in the combined power generation unit, wherein the control system includes a dead time compensator that compensates for a lag and a dead time occurring while the fuel gas is fed from the gasification unit to the combined power generation unit in addition to the feed-forward control, and wherein said dead time compensator detects an increase or a reduction in the flow rate of the fuel gas that is produced according to the required power load as an increase or a reduction in pressure, and transmits a pseudo signal to a gas pressure controller so that the manipulation amount is set to be small as if the change in power load is small, even though the change in power load is large.