| With the development of information technology,industrial production has higher and higher requirements for control system,resulting in numerous research results of networked cascade control system.Singular networked cascade control system means that the controlled object is a singular system model.Once it is proposed,it has attracted the attention of many scholars.The research results are not only in the theoretical research part,but also applied to the actual industrial production.The introduction of singular system into networked cascade control system makes the system more complex.Many problems need to be considered at the same time,such as impulse,regularity,network induced delay and state delay,which may reduce the system performance and even affect the stability.Therefore,the analysis of singular networked cascade control system has extremely important research value.In this thesis,the singular system is selected as the controlled object,and the singular system is applied to NCCSs to form SNCCSs.According to different generalized controlled objects,SNCCSs can be divided into linear continuous SNCCSs and linear discrete SNCCSs.Among them,linear continuous SNCCSs can be divided into interference and non-interference.The mathematical models of SNCCSs are established respectively.Based on these models,the sufficient conditions for the stability of the system are given,and the main and sub controllers of the system are further designed together.This has laid a good foundation for better application to practical industrial production.The specific research process is as follows:Firstly,the event triggered controller is introduced into SNCCSs.For the controlled objects in three different situations: non-interference linear continuous SNCCSs,interference linear continuous SNCCSs and linear discrete SNCCSs,the mathematical models are established respectively.The established mathematical models consider the effects of network induced delay,cascade control and event triggered control.Further,based on the model,the sufficient conditions for the stability of the system are obtained by using Lyapunov function and linear matrix inequality.Then the main and auxiliary controllers are designed together under the stability of the system.Finally,the feasibility and practicability of the system are illustrated by the simulation example of steam temperature control system in thermal power plant. |
