PRESSURIZED FLUIDIZED BED BOILER COMPOSITE GENERATING PLANT, LOAD CONTROL METHOD AND DEVICE THEREOF

PURPOSE:To operate the boiler stably and improve the load control capability for a pressurized fluidized bed boiler composite generating plant. CONSTITUTION:A load setting signal which is set by a unit load setting device 20 passes through a variation rate controller 21 and upper and lower limit limiter 22, and is added with a control operation signal based on the deviation with a total generator output 30 to create a boiler input command. The signal compensates a gas turbine generator output quantity with nonlinear characteristics by a boiler input correcting circuit which is constituted of a gain converter 24, divider 26, monitor relay 27, signal generator 36, signal switching device 37 and analog multiplier 25, and a correcting boiler input command 35 is created. Since the boiler input command is created by eliminating the nonlinear characteristics of the gas turbine generator output to the unit load command, a stable boiler output control can be performed without letting the boiler perform an unnecessary operation (especially, layer height control equipment).