计算机工程 ›› 2012, Vol. 38 ›› Issue (9): 108-110,113.doi: 10.3969/j.issn.1000-3428.2012.09.032

• 网络与通信 • 上一篇    下一篇

基于双观测器的网络控制系统稳定性分析

高会生,李潇睿,王 杉,展敬宇   

  1. (华北电力大学电子与通信工程系,河北 保定 071003)
  • 收稿日期:2011-09-28 出版日期:2012-05-05 发布日期:2012-05-05
  • 作者简介:高会生(1963-),男,教授、博士,主研方向:网络信息系统,信息安全;李潇睿、王 杉、展敬宇,硕士研究生

Stability Analysis of Networked Control System Based on Double Observers

GAO Hui-sheng, LI Xiao-rui, WANG Shan, ZHAN Jing-yu   

  1. (Department of Electronics and Communication Engineering, North China Electric Power University, Baoding 071003, China)
  • Received:2011-09-28 Online:2012-05-05 Published:2012-05-05

摘要: 网络控制系统存在网络诱导时延和数据包丢失等问题,使网络控制系统控制性能下降甚至导致系统不稳定,同时在实际应用中存在双闭环的情况,并且一些系统的状态不可测量。针对上述问题,设计2个状态观测器,利用测量输出进行状态重构,并采用状态观测器对丢包进行补偿,应用指数稳定定理分析整个系统的闭环稳定性,给出状态控制率的求解方法。仿真结果证明,该方法能有效补偿网络控制系统的性能,保证在时延和有数据包丢失情况下的网络控制品质。

关键词: 网络控制系统, 状态观测器, 时延, 丢包, 双闭环控制

Abstract: With the network induced time delay and data packet losses in Networked Control System(NCS), the performance of control systems degrades even destabilizes. In practice the states of some systems are unmeasured. This paper designs two state observers to estimate the states and when data packet losses, the state observers can compensate it. Exponential stability theory is used to analyze the stability of closed loop system and the method calculating the control parameter is given. A motor is used to simulate. Simulation result shows that the validity of the proposed method which guarantees the stability of network control system with network induced time-delay and data packet losses.

Key words: Networked Control System(NCS), state observer, time delay, packet loss, double closed loop control

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