内模网络控制系统稳定性

在网络控制系统中随机延时的存在使系统的性能变差甚至不稳定.本文重点分析内模网络控制系统中存在的延时对系统性能的影响;从连续系统、状态空间的角度出发利用劳斯稳定性判据、李亚普诺夫方法判断系统的稳定性,给出了保持系统稳定的最大允许延时阈值.为了使内模网络控制系统获得良好的性能,在内模网络控制系统中加入延时预测环节,并分析了延时预测对系统稳定性的影响.仿真表明本文提出方法的有效性.

Stability Analysis of Internal Model Networked Control Systems

Due to the stochastic delay in the networked control systems,the system performance goes to bad and unstable.The emphasis of this paper is the effect of delay on internal model networked control systems(IMNCS) performance.The continuous system stability is discussed by using Routh criterion and state space Lyapunov stability theory respectively,thus the maximum allowed time-delay that keep system stability is also analyzed.In order to make better performance of IMNCS,the delay prediction loop is added and the system stability influenced by prediction is pointed.Simulation results are illustrated that the proposed scheme is very effective.