Aimed at the features of bed temperature of circulating fluidized bed boilers

a fraction-order PID predictive control based on the Laguerre function was proposed in combination with the advantages of fraction-order PID control and predictive control. The algorithm uses Laguerre function model that is insensitive to delay and structural changes as a prediction model

and transforms the receding optimization index into the PID-type structure. It has two adjustable parameters

the integral step number and the differential step number

compared with the integer-order PID

which improves the performance of the control system. The algorithm was applied to bed temperature control for circulating fluidized bed boilers

and the simulation results show that this control system has advantages of no overshoot

short adjustment time and strong adaptability

the control system has good control quality.