板宽板厚多变量系统的自抗扰解耦控制

针对精轧的板宽板厚多变量系统具有强耦合、大时滞、不确定性、干扰因素多、非线性等特点,应用自抗扰控制(ADRC)静态解耦和扩张状态观测器(ESO)动态解耦技术,给出一种多变量系统的ADRC解耦设计方案. 为提高时滞对象的快速性,设计了一种去掉跟踪微分器(TD),由ESO和非线性状态误差反馈控制律(NLSEF)两部分组成的ADRC,其中NLSEF改用非线性函数实现,ADRC阶次比常规方法低一阶. 仿真结果表明,该控制方案不仅解耦效果好,而且对模型的不确定性和外部扰动具有较好的鲁棒性和适应能力.

Active disturbance rejection decoupling control for strip width and gauge multi-systems

A new control solution to finishing automatic width control (FAWC) and automatic gauge control (AGC) is proposed based on active disturbance rejection controller (ADRC) because the plant is of serious decoupling, large time-delay, uncertainty, many disturbances and nonlinear etc. A new kind of static and dynamic decoupling way based on extended state observer (ESO) is presented to eliminate the coupling between FAWC and AGC. In order to produce the fast transient response of the time-delay system, the proposed ADRC consists of the ESO and nonlinear state error feedback (NLSEF) without tracking differentiator (TD). The performance of NLSEF is improved by using a nonlinear function and the order of ADRC is lower than the routine ADRC. Simulation results show that the designed controller not only has good decoupling performance, but also ensures good robustness and adaptability under modeling uncertainty and external disturbance.