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The Sliding Mode Control of the Drum Water Level Based on Extended State Observer

The characteristics of the drum water level system are strong disturbance, nonlinear, strong coupling and multivariable. The sliding mode control (SMC) technique has the advantages of quick response and strong robustness. The linear extended state observer (LESO) takes the total disturbance of the system as the extended state of the system for modeling and reconstruction, so that the state observer has the ability to estimate the equivalent disturbance of the system. Combined with the advantages of two methods, the sliding mode control based on the extended observer (SMC-LESO) is applied to the control of drum water level. In the case of external disturbance and model parameter mismatch, the dynamic performance of the system is compared with that of the linear active disturbance rejection control (LADRC) system. Simulation results show that the SMC-LESO has the advantages of small overshoot, short settling time, strong anti-interference ability and good robustness. It has good engineering application value and the prospect.