Disturbance rejection in hydraulic automation position control system for rolling mills

The hydraulic automation position control (HAPC) system for rolling mills is always difficult to design with high accuracy due to the uncertainties and other external disturbances. Employing a linear, low-order and optimization parameters, the high-order uncertain dynamics and unknown disturbances in plant dynamics is estimated by extended state observer (ESO). The resulting active disturbance rejection control (ADRC) is simple to use, easy to tune. Simulation results show that the proposed ADRC has better robustness and adaptability than PID.