资源约束网络控制系统的非均匀采样控制

Non-uniformly Sampling Control of Networked Control Systems with Communication Constraints

针对一类存在通信约束的多输入多输出(MIMO)网络控制系统(NCS),根据通信序列的概念和提升技术,将其建模成一类集控制和调度为一体的非均匀采样的增广状态空间模型,并基于线性矩阵不等式(LMI)设计输出反馈控制律.该模型具有线性时不变离散时间系统的形式,为资源约束网络控制系统的分析与综合提供了一种新方法.所提出的单一结构控制器不仅可以有效克服离散周期性时变系统的控制器受原有通信序列周期约束,避免多个控制器周期性切换.同时,由于信号量可以根据其特征进行采样频率调度,从而能有效降低网络负荷,提高系统性能.

By employing the notion of communication sequence and lifting techniques, a class of multiple-input-multiple- output （MIMO） networked control systems （NCSs） with communication constraints is modeled into an extended state-space model with non-uniformly sampling in which control and scheduling are integrated. Based on linear matrix inequalities （LMIs）, the output feedback control law is designed. The new model has the pattern of time-invariant discrete-time system, and it affords a new way for the analysis and research of NCS with communication constraints. The proposed controller with a single structure can not only overcome restricted from the cycle of original communication sequences and avoid multiple controllers periodically switching, but also reduce the network load and improve the performance of the system effectively by scheduling the sampling frequency based on the characteristics of the signal.