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Robust Fault Tolerant Control Of Networked Control Systems

Posted on:2009-05-04Degree:MasterType:Thesis
Country:ChinaCandidate:W P HouFull Text:PDF
GTID:2208360245479201Subject:Control theory and control engineering
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Networked control system (NCS) is a kind of feedback control systems where the control loops are closed through real-time control network. In engineering practice, this kind of automated control system is more vulnerable to faults. The consequence could be damage to technical parts of the plant, to personnel or the environment. Therefore, the research on fault-tolerant control of networked control system has theoretical and applied significance.Focus on the time delay and the data packet dropout of NCSs, the robust fault-tolerant control of networked control systems (NCSs) is studied in this dissertation.Firstly, based on the Lyapunov stability theory and the technique of Linear Matrix inequalities(LMIs), the robust fault-tolerant control of NCSs with delay shorter than one sample period are studied, and NCSs with and without outside disturbances are considered respectively. Through the introduction of non-memory state feedback control law, the sufficient condition which is subject to the asymptotic stability for the NCS with failures of actors or sensors is derived. The design approach of the controller is given. The results of simulations show the effectiveness of this method.Secondly, based on the H_∞control theory, the robust fault-tolerant control of NCSs with delay which is uncertain are studied, and NCSs with and without outside disturbances are considered respectively. The design approach of the controller is given. By using this approach, the NCSs with failures of actors or sensors are also asymptotic stable. The results of simulations show the effectiveness and feasibility of this method.Finally, the NCSs with network-induced delay and packet dropout are modeled as asynchronous dynamical systems. The integrity design of an NCS is analyzed using hybrid systems technique based on the theory of asynchronous dynamical systems. The design approach of the controller is given. The research shows that this controller makes sure the NCSs with data packet dropout are also asymptotic stable when the NCSs have failures of actors or sensors. The results of simulations show the effectiveness of the proposed method.
Keywords/Search Tags:Networked Control Systems (NCSs), Fault-tolerant Control, Time Delay, Data Packet Dropout, Linear Matrix Inequalities (LMIs)
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