Decoupling Double-Loop Control System with ADRC

An active disturbance rejection controller (ADRC) is proposed for decoupling double-loop control system. The ADRC consists of the tracking differentiator, the extended state observer and the nonlinear state error feedback. With this approach, the double-loop system with time delay is treated as two correlated control loops according to the best variable pairs selection, the interactions of two control loops can be estimated by the extended state observers, and the nonlinear state error feedback compensates the interactions. Finally, an experiment is designed to show the effectiveness of the proposed scheme.