特征结构下多变量预测控制系统的闭环反馈结构及其应用

The Closed-feedback Configuration of Multivariable Predictive Control System Under Characteristic Frame and Its Application

文献[1]把多变量频域设计方法和单变量预测控制结合起来,提出了在特征结构下的多变量预测控制算法。本文在此基础上提出了特征结构下多变量预测控制系统的闭环反馈结构。利用此反馈结构不仅可有效地减少多变量预测控制算法的计算量及所需的存贮空间,而且还可以方便地判别此类预测控制系统的闭环稳定性。文中以火力发电厂中带汽-汽换热器的20万千瓦火电机组汽温系统为例进行了预测控制的仿真,仿真结果表明,用本文所提出方法设计的多变量预测控制系统,具有良好的控制效果。

To combine multivariable frequency domain design techniques with SISO predictive control,reference [1] presented the multivariable predictive control algorithm under characteristic frame.On the basis of it,a closed-feedback structure of multivariable predictive control system projected onto characteristic frame is presented in this paper.By using this structure,not only can effectively reduce computational load and memory storage for implementation.but also can easily test the closed-loop stability of muluvariable predictive control system.In order to verify the validity of algorithm,a simulation experiment of predictive control system for steam temperature control of a 200MW thermal power unit made by our country is illustrated.The simulation results show that the multivariable predictive control system designed by the method presented in this paper has good control performance.