自适应预测控制在三容水箱液位系统中的应用

Application of Three-Tank Water Level System with Adaptive Predictive Control

三容水箱液位系统具有典型的非线性、大滞后特点,能够很好地模拟复杂的工业液位控制对象,而经典控制理论和现代控制理论在三容水箱液位系统中很难取得好的控制效果。通过分析三容水箱物料平衡关系,构建液位控制系统模型,并进行离散化处理,结合自适应预测控制方法对三容水箱液位系统控制进行研究,并完成系统控制器的设计。仿真结果表明,自适应预测控制方法综合了自适应控制方法和预测控制方法,不仅维持了自适应控制方法本身的特性,还具备预测控制方法的控制效果好、鲁棒性强等优点。因此,与传统PID控制方法和自适应控制方法相比,自适应预测控制方法能够获得更好的控制跟踪性能,其控制精度更高,响应速度更快速。

Three-tank water level system is typical with the features of nonlinearity, time-delayed, which makes it capable for simulating complex level control object in industries. However, classical and modern control approaches find themselves diffwult to meet practical necessities in industrial application. This paper adopted an advanced control method based on adaptive predictive control applied to the three-tank water level system. The level system was first modeled through analyzing the population balance of three tanks, and the model was discretized. In the way, the adaptive predictive control method was utilized to design a controller for the systems. The simulation result demonstrated that, the adaptive predictive control method is integrated with adaptive control method and predictive control method, which not only maintains the characteristics of adaptive control method, but also has the advantages of good control effect and strong robustness. Therefore, when compared with traditional PID control method and adaptive control method, the adaptive predictive control method had a better controlling performance with more precise tracking process and faster response speed.