Robust Control Of Nonlinear Networked Control System With Time-delay

In Networked Control Systems(NCS), Network communication is becoming more and more important in control system. Because of the delays and the uncertainty of the delays, package drop and disorder of data, the control systems are no longer invariable or deterministic. The problems mentioned above arise new challenges and opportunities. This article analyzes the characters of NCS systematically and analyzes the impact which the characters and disturbance bring to the control system. Subsequently, the design of H∞Robust controller was given. This method solved the stability problems and Robust problems which induced from Network delays and disturbance.Firstly, we focused on the delays problem of continuous system. This problem can be defined as invariable delays and variable delays. Analysis of system is given under both situations, and also the controller which enable systems asymptotic stable.Secondly, the T_S fuzzy discrete NCS with both short and long delays is studied, respectively. The uncertainty of the delay is converted into the uncertainty of the system matrix. Then the controller is designed base on Linear Matrix inequality (LMI). And the controller could enable the loop system L2 gain smaller thanγrobust stable.In the end, the T_S fuzzy system of inverted pendulum based on Truetime toolbox of Matlab is set. It is proved that the method in the method is valid.