Output-feedback Control For A Class Of Interconnected Nonlinear Time-delay Systems

In recent years,the research on interconnected nonlinear system has been paid more and more attention in the field of nonlinear control.Interconnected nonlinear systems are widely found in engineering practice,such as power systems,complex power grid control systems,electromechanical systems,etc.The actual interconnected nonlinear system under the impact of the complex structure,the huge number of complex factors such that the required control methods and strategies are also complex and strong robustness,and the proposed decentralized control strategy can make the controller design problem of interconnected nonlinear systems be solved.The time-delay function,unknown interconnected function,and unknown states variables also seriously affect the stability of the system,and bring new challenges in the controller design process.Based on the Backstepping controller design method,a decentralized control strategy is proposed in our paper to ensure the transient performance and steady state performance of the nonlinear system.Firstly,we introduce the research background and the basic theory of system stability analysis for the interconnected nonlinear time-delay system.The Backstepping design procedure,decentralized-filters,RBF neural network,prescribed performance control and other control strategies in nonlinear control were briefly introduced and analyzed.Secondly,for a class of multi-input interconnected nonlinear time-delay control system,considering the symmetric prescribed performance function,and design the time-delay independence decentralized filter and adaptive neural network output feedback controller.It is guaranteed that all signals of the closed-loop system are semi-globally uniformly bounded,and the output of the system can track the given signal very quickly and the tracking error are within the bounds.Optimize the performance of the system,with theoretical methods and simulation experiments to prove the effectiveness of the design of the controller.Finally,for a class of multi-input stochastic interconnected nonlinear time-delay control systems,considering the existence of unmodeled dynamics and the dynamic interaction terms on the output with the existence of time-delay,using Backstepping control algorithm,by RBF neural network approximates the unknown nonlinear function,design of time-independence decentralized filter and adaptive neural network output feedback controller.It is ensured that all the signals in the system are bounded in probability.And the validity of the designed controller is verified by the simulation examples.