Cascade predictive control for AGC in hot strip rolling
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摘要: 在監控自動厚度控制(AGC)系統基礎上,增加一個壓力AGC副回路控制.基于Smith預估模型,采用串級控制方式以綜合使用監控AGC與壓力AGC.副回路采用PID調節方式,主回路基于廣義預測控制(GPC)算法求解控制器.由于增加了副回路控制,對進入副回路的干擾有超前抑制作用,因而減少干擾對主變量的影響,提高了抗干擾能力,從而改善了過程的動態特性.仿真結果表明該方法是可行性的,具有較好的控制性能.Abstract: 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.
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