温度大时滞串级-Smith预估控制系统建模与仿真

Modeling and Simulation of Temperature Large Time Delay Cascade-Smith Predictive Control System

本文针对大时滞系统在控制过程中存在的容量滞后较大、调节作用不及时、干扰比较频繁和动态偏差量大等常见问题,建立了温度大时滞串级-Smith预估控制系统的数学模型,该模型有效地改善了系统性能,解决了温度控制品质难以提高的问题。以典型温度大时滞控制系统——聚合釜温度控制系统为例,通过引入串级-Smith预估控制以改善系统性能,提高温度控制品质。根据聚合釜温度控制系统的一般特性,进行了聚合釜温度控制系统的系统模型建立和控制器参数整定,并通过MATLAB/Simiulink进行了仿真分析。实验结果表明,相对于单回路PID控制和串级PID控制系统,采用串级-Smith预估控制系统可以明显改善聚合釜温度控制系统的品质,大幅度降低了大时滞系统中由于容量滞后对系统动态性能的影响,使系统具有更优的动态特性和鲁棒性。

Aiming at common problems of Large time-delay system in control process, such as large capacity lag regulation is not timely,frequent interference and large amount of dynamic deviation, this paper establishes the temperature delay cascade-Smith predictive control system mathematical model. The model can effectively improves the system performance, and solves the problem of difficult to improve the temperature control quality. In this paper, the typical temperature control system with delay-polymerization kettle temperature control system as an example. By introducing the cascade-Smith control to improve system performance and improve the quality of temperature control. According to the general characteristics of polymerization kettle temperature control system, the system model of the temperature control system of polymerization reactor is established and the tuning of the controller, and simulation analysis by MATLAB/Simiulink. Experimental results show that compared with single loop PID control and cascade PID control system, using cascade Smith predictive control system can significantly improve the polymerization kettle temperature control system of quality, greatly reduces the large time delay system due to the capacity of lag effects on the dynamic performance of the system, the system has better dynamic performance and robustness.