To deal with the complex features of bed temperature control of circulating fluidized bed boilers

such as large inertia

time-varying and multiple interference factors

a new GPC-PID algorithm combing generalized predictive control(GPC)with PID control was proposed.By applying the PID's structure and through rolling optimization within a limited time domain

the GPC algorithm online regulates the proportion coefficient

integration coefficient and differential coefficient to achieve the optimization of the performance indicators.Moreover

the new GPC-PID algorithm is with a small amount of calculation and superior to the GPC algorithm.The new algorithm was applied to bed temperature control of a circulating fluidized bed boiler.The simulation results show this GPC-PID algorithm has excellent setpoint tracking capacity

robustness and adaptability

which has great control quality.