热连轧AGC系统的串级预测控制

Cascade predictive control for AGC in hot strip rolling

在监控自动厚度控制(AGC)系统基础上,增加一个压力AGC副回路控制.基于Smith预估模型,采用串级控制方式以综合使用监控AGC与压力AGC.副回路采用PID调节方式,主回路基于广义预测控制(GPC)算法求解控制器.由于增加了副回路控制,对进入副回路的干扰有超前抑制作用,因而减少干扰对主变量的影响,提高了抗干扰能力,从而改善了过程的动态特性.仿真结果表明该方法是可行性的,具有较好的控制性能.

An automatic gauge control（AGC） secondary loop control system was added to a monitor AGC system.A cascade control scheme was proposed for the AGC system based on the Smith prediction control model.Generalized predictive control（GPC） was used in the monitor AGC main control loop and a PID control strategy was applied to the secondary loop.Due to the secondary loop control system,disturbances added in the secondary loop are rejected,thus the influence of disturbances on the main control loop is weakened,the ability of rejecting disturbances is increased,and the control precision is improved.Simulation results show that the control strategy is effective and has a better control performance.