一类网络化串级控制系统的分析与建模

Analysis and Modeling of a Class of Networked Cascade Control System

串级控制系统中,控制回路是通过实时网络闭合的,称为网络化串级控制系统。针对基于现场总线的一类网络化串级控制系统,主控制器和副控制器都采用了动态输出反馈,在网络诱导时延小于一个采样周期的情况下,利用增广状态向量法,将系统建模为有限维离散时间线性系统。最后,讨论了网络化串级控制系统中需要进一步研究的若干问题。

Cascade control systems wherein the control loops are closed through a real-time network are called networked cascade control systems. Using the method of the augmented state vector, a class of networked cascade control system based on fieldbus, in which the dynamic output feedback, is adopted by the controllers, is analyzed and modeled, taking into account the network-induced delay which is less than a sampling period. It＇s shown by the result that the whole system is modeled as a finite-dimensional discrete-time linear system. Finally, some issues on networked cascade control system need to be further researched in future are discussed.