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Decentralized Adaptive Controller Design For Unmatched Interconnected Time-delay Large Systems

Posted on:2022-10-11Degree:MasterType:Thesis
Country:ChinaCandidate:C YangFull Text:PDF
GTID:2518306323986449Subject:Control theory and control engineering
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In recent years,large-scale systems have been widely used.By constructing novel LyapunovKrassovskii function,this thesis studies the design of decentralized adaptive controllers for nonlinear interconnected time-delay large-scale systems with uncertain mismatching terms.Without using the linear matrix inequality,an explicit controller gain function is proposed,and an adaptive method is used to estimate and compensate the unknown and uncertain terms in the system.The main research contents of this thesis are as follows:In the second chapter,a decentralized adaptive control algorithm of precise controller gain is proposed for a class of uncertain interconnected time-delay large-scale systems with mismatched items.The system is decomposed into cascaded systems,and uncertainties are estimated and compensated with the help of adaptive control methods,which simplifies the analysis steps of controller design,reduces the complexity of controller input signals,and makes the system state of the controlled system asymptotically converges to zero,and its feasibility is verified by numerical simulation.In the third chapter,the decentralized adaptive controller algorithm proposed in the second chapter is introduced into the tracking control.The adaptive control problem of a class of uncertain and mismatched interconnected large-scale time-delay systems with dead-zone inputs is studied.By decomposing the system into cascaded systems and using the adaptive control method to compensate the uncertainties and dead-zone input of the system in the case of bounded disturbance,the error of the closed-loop system converges exponentially to an adjustable region and can resist bounded delay,disturbance and general dead-zone signals.Finally,two examples are given to verify the effectiveness.In the fourth chapter,the decentralized adaptive robust controller algorithm proposed in the third chapter is extended to the model reference control of the unknown controlled system.The adaptive control problem of a class of uncertain and mismatched interconnected large-scale systems with unknown time-delay and dead-zone input is studied.Using reasonable matching conditions,the adaptive rate is used to control the system.In the case of bounded disturbance and time delay,it is concluded that the closed-loop system error still converges exponentially to a adjustable region.Two examples are given to verify the results.
Keywords/Search Tags:Asymptotic stability, Exponential convergence, Interconnected large-scale systems, Time-delay systems, Decentralized adaptive control, Nonlinear systems, Unknown systems, Model reference tracking
PDF Full Text Request
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