Model Predictive Control Of Uncertain Network Control Systems With Time-delay And Data Packet Loss

Transmission delay and data packet loss in the network control system areinevitable, and they will often lead to instability of the system. By modelpredictive control method and the design of network model predictive control tocompensate the network time delay and data packet loss, we can improve thestability of the system. In addition, in the practical system modeling, because ofthe influence of the internal mechanism and the external environment, the modelcan’t accurately describe the practical problem, so there are uncertainties in thepractical system model. Uncertainties are the main reason of instability.Therefore, the study of the problems of uncertain control system under thenetwork environment will have important theoretical and practical value. In thisthesis, the model predictive control method is invest igated in the network contro lsystem with time delay and data packet loss and the main contents are organizedas follows:1. The model predictive control strategy of the uncertain network controlsystem with time delay is studied. Assume that sensor and controller, as well ascontroller and actuators, are connected with network and that there istransmission delay in the network. A state observer is designed under the systemstates unobservable. Min-max robust model predictive control method is used todesign a predictive controller. The control redundancies of robust modelpredictive control are used to design the network time delay compensator, inorder to solve the influence of time delay on the stability in the network system.A model predictive control algorithm of the stability control o f the system isachieved.2. The model predictive control method of uncertain network control system with data packet loss is studied. Assume that there is random data packets loss inthe channels between sensor and controller, and between controller and actuators.By using data which is not lost to estimate online the lost data, and selectingappropriate prediction horizon and optimizing boundaries, based on min-maxrobust model predictive control method a robust model predictive controller isdesigned, and the corresponding model predictive control algorithm of networkcontrol system is designed.