Research on Stability Analysis and Guaranteed Performance Control of Networked Control System in Nuclear Power Plants

Abstract

Steam generator is one of the important equipment of nuclear power unit, it is a highly complex system, the difficulty of its water level control is the phenomenon of false water level and wide range of parameter changes, which brings many difficulties to the design of its control system, steam generator has obvious non-linearity, roughly after strong interference, small stability margin and other characteristics, while its system load changes in a wide range.Network control system is the future development trend, network control system will be scattered in different locations of sensor controllers and actuators, through the network connected to form a closed-loop distributed control system network control system, because the introduction of the network and has the advantages of application installation and maintenance to reduce their own weight, reduce operating costs, so that the application of network control system becomes more extensive and convenient, but at the same time, the Network in the delay, packet loss, variable sampling and other issues, will have an impact on the performance of the network control system.In this paper, we study the network control system with time-varying sampling period, and carry out stability analysis and performance-preserving control based on modeling, etc. For a class of network control system with external perturbation of network time delay and variable sampling period, we establish a discrete mathematical model of the network control system by transforming the randomly varying sampling period into uncertain parameters in the system and discretizing the linear continuous controlled object under study. The optimal performance-preserving state feedback controller is studied and designed, and the controller parameters are given based on feasible solutions of linear matrix inequalities, and simulations prove the effectiveness of the method.