实用自抗扰控制在大时滞厚度自动监控系统中的应用

Practical active disturbance rejection solution for monitoring automatic gauge control system with large time-delay

中文关键词  监控AGC  时滞  自抗扰控制  扩张状态观测器

英文关键词  monitoring automatic gauge control  time-delay  active disturbance rejection control  extended state observer

中文摘要

      针对热连轧监控AGC(自动厚度控制)大时滞系统具有不确定和干扰因素多等特点, 采用线性降阶模型及参数优化设计, 提出一种实用自抗扰控制(ADRC)控制方案, 以满足简单、实用、好调、节能等工业界的要求. 通过对被控对象和状态观测器的降阶, 使得系统总扰动(内部不确定性、外部扰动) 的实时估计由一个仅为一阶的扩张状态观测器就可实现. 为了把所设计的实用ADRC与常规ADRC、常规Smith预估器和PID控制器进行公平比较, 各控制器的最佳参数均采用变尺度混沌优化方法得到. 仿真结果表明, 两种ADRC的抗扰性和鲁棒性优于常规的Smith预估器和PID控制器. 与常规ADRC相比, 实用ADRC的可调参数大大减少, 能耗指标也明显降低, 为下一步的工程实现提供了途径.

英文摘要

      A practical active disturbance rejection control (ADRC) solution is proposed for the monitoring automatic gauge control (AGC) system with large time-delay in the hot strip mill. Employing a linear reduced-order model with optimized parameters, the practical ADRC is simple to use, easy to tune and energy-efficient in dealing with the uncertainties and disturbances in plant dynamics. Through the order reduction in both the plant model and the state observer, we develop a first order extended state observer for estimating in real-time the total value of the external and internal disturbances. Simulation results show that the proposed practical ADRC solution compares favorably to the existing solutions, including the standard ADRC, the Smith Predictor and the PID controller, which are all optimized using the mutative scale chaos optimization method to make the comparisons fair. Both the practical and standard ADRCs outperform the Smith Predictor and the PID controller in disturbance-rejection and robustness; however, the practical ADRC has fewer adjustable parameters and significantly smaller energy consumption than the standard ADRC, making it a viable candidate for industrial applications.