非线性系统的多内模控制

Multiple internal model control design for nonlinear system

任何一个实际系统均具有一定程度的非线性,由于非线性对象的复杂性,目前还没有统一的控制器设计方法,用传统的线性系统理论来设计,当工作点大范围变化时,很难保证其性能及稳定性.本文提出了基于多模型的内模控制方法,它对非线性过程的控制具有良好的性能.在该方法中,非线性对象的内模是通过在不同工况辨识得到多模型.仿真结果表明,该控制策略比常规的单内模控制在大范围具有更好的控制品质.

Any actual system has nonlinear characteristics. There is no unified controller design method at present. The control of nonlinear processes to ensure good performance and stability over a wide range of operating conditions is difficult. Multiple internal model control (MIMC) design strategy was developed for a class of nonlinear systems. The process internal model is represented by the weightedsum of the linear model by using model validity function. Simulation result of CSTR showed that the proposed MIMC design method is superior to its conventional counterpart in performance.