Backstepping Sliding Mode Control for the Speed and Tension System of Reversible Cold Strip Rolling Mill Based on Extended State Observers

In order to weaken the influences of system uncertainties on the coordinated tracking control performance of the speed and tension system of the reversible cold strip rolling mill, a backstepping sliding model control strategy is proposed based on the extended state observers (ESOs). First, the ESOs are constructed to dynamically observe the system's unmatched uncertainties, which effectively improve the system's tracking control precision. Next, based on the backstepping control and the tracking differentiators (TDs), the integral sliding mode controllers (ISMCs) for the speed and tension system of the reversible cold strip rolling mill are designed, which solve the "differential explosion" problem of conventional backstepping control, and improve the robust stability of the system, Finally, simulation research is carried out on the speed and tension system of a 1422 mm reversible cold strip rolling mill by using actual data, and the results show the validity of the proposed control strategy.