基于两级Smith预估补偿的加热炉温度串级控制

Temperature Cascade Control of Reheating Furnace Based on Two-stage Smith Predictor Compensation

对于具有纯滞后的温度串级控制系统,提出了主副回路基于两级Smith预估补偿的串级控制结构;通过内模-PID整定方法设计了两级Smith预估装置进行补偿控制,仿真证明了方法的有效性。仿真结果表明,该方法能够有效消除纯滞后环节的影响,得到良好的系统鲁棒性和动态控制性能,解决了汽油加氢反应进料加热炉温度串级控制系统中加热炉出口温度的时变性及滞后性等控制难点。

For the temperature cascade control system with pure delay,a cascade control structure based on two-stage Smith predictor compensation for the major and minor loops is proposed. The two-stage Smith prediction device is designed by inter nal model PID setting method for compensation control,and the effectiveness of the method is proved by simulation. The simulation results show that the method can effectively eliminate the influence of the pure lag link,also has better system robustness and dynamic control performance,and solve the control difficulties such as the time-varying and lag of the furnace outlet temperature in the temperature control system of the gasoline hydrogenation reaction feed furnace.