基于α阶逆解耦的多变量内模控制系统研究

Research on multivariable internal model control system based on αth-order inverse decoupling

由于工业过程控制中存在大时滞现象,使得单变量内模控制难以获得有效的控制,而多变量内模控制成为一种较好的控制策略。文中简单介绍了多变量内模控制的原理,分别基于主回路为控制对象、V规范解耦的原则和α阶逆解耦进行内模控制器的设计,阐述了各个控制器的主要思想及其设计的具体方法。通过仿真比较模型匹配与模型失配下的内模控制输出仿真图。由仿真结果可以得出,基于V规范解耦的内模控制器具有较好的控制效果,但是解耦效果存在缺陷,针对非线性系统提出的基于α阶逆解耦的内模控制系统具有较好的解耦和控制效果。

Since the single-variable internal model control is difficult to obtain the effective control due to the large time delay in the industrial process control,the multivariable internal model control can better solve the problem. The principle of multivariable internal model control is introduced briefly,and the internal model controllers are designed on the basis of the main loop taken as the control object,principle of V specification decoupling and αth-order inverse decoupling respectively. The main ideas of each controller and its design method are described. The output simulation charts of internal model control at model matching and model mismatching are compared with simulation. The simulation results show that the internal model controller based on V specification decoupling has better control effect,but there are some defects in decoupling effect. The internal model control based on α th-order inverse decoupling is proposed for nonlinear systems,and the system has perfect decoupling and control effect.