“…Therefore, scholars around the world put forward many controllers to replace PI controllers, such as fuzzy control [6,7,8,9,10], active disturbance rejection control [11,12,13,14,15,16], model predictive control [17,18,19,20,21], adaptive control [22], etc. Sliding mode variable structure control has attracted more and more attention due to its low requirements on model accuracy and strong robustness to parameter perturbation and external disturbance [23].…”