Active Disturbance Rejection Control on a bubbling fluidized bed

Bubbling fluidized bed is a system characterized by multivariable coupled, long time delay and big inertia. Based on the analysis of the dynamic performance of this kind of systems, a thoroughly-decentralized Active Disturbance Rejection Control (ADRC) system is designed, where the cross-couplings between control loops are treated as “disturbance”, estimated in real time and rejected; A parallel proportion of error is added to the loop with time delay, improving the control effect. Based on the practical requirements, a simulation of load set point tracking and fuel feed disturbance rejection is carried out, and the result is compared with a PI control system with static decoupling. The simulation result shows that the designed ADRC system has a simple structure and it is easy to tune the controller. Moreover, the designed control system has good performance and strong robustness.