SLIDING MODE CONTROL BASED ON DISTURBANCE OBSERVER AND QUASI-SLIDING MODE FOR TWO_TANK INTERACTING SYSTEM

Abstract

This article presents a method to design a sliding mode control based on disturbance observer and Quasi-sliding mode (SMC_DO_Q) for two_tank interacting system. In process industries like petroleum refineries, chemical, paper industries, water treatment industries the control of liquid level in a tank system is a major concern. The sliding mode control guarantees the actual liquid level follows the desired level in a finite time. The disturbance observer will estimate the disturbance and uncertainty, and the compensation will be realized in the feedback control. The Quasi-sliding mode is used to overcome the chattering phenomena in the sliding mode control. Simulation results in MATLAB/Simulink show the performance of the proposed controller and are compared with Fuzzy Logic Controller, Fuzzy-PID Controller, Fuzzy-Optimized model reference adaptive control based on the Lyapunov rules and Sliding Mode Control using Conditional Integrators without the overshoot, the rising time achieves 0.3183(s), the settling time is 0.5102(s) and the steady-state error is eliminated.