Sliding mode predictive fault-tolerant control method for actuator faults in variable time-delay control systems

Abstract

The invention discloses a sliding mode prediction fault-tolerant control method for variable time delay control system executor faults. A system sliding mode prediction model with time varying features is designed by using a pole assignment method according to system output errors, and the model can dynamically change the moving quality of the system while guaranteeing the asymptotic stability of a sliding mode. A novel discrete sliding mode prediction reference trajectory is provided by considering the simultaneous influence of a time delay system by internal parameter fluctuation and external disturbance, and the reference trajectory can not only ensure good robustness and fast convergence of the state of the system in a process of approaching to a sliding mode plane, but also obviously inhibit the sliding mode buffeting phenomenon. A rolling optimization process is improved by using multi-agent particle swarm optimization, a control rule can be solved quickly and accurately, and the premature problem of the traditional particle swarm optimization can also be effectively avoided. The sliding mode prediction fault-tolerant control method disclosed by the invention is applied to the robust fault-tolerant control of an uncertain discrete system with time varying and time delay.

Description

technical field [0001] The invention relates to a sliding mode predictive fault-tolerant control method for actuator faults in variable time-delay control systems, and belongs to the technical field of robust fault-tolerant control of uncertain discrete control systems. Background technique [0002] With the rapid development of computer technology and the actual needs of industrial automation and other fields, the analysis and design of discrete control systems have become an important part of control theory. In engineering practice, there are often certain errors in the modeling process of discrete systems, the physical structure of the system will inevitably be affected by working conditions, and there are inevitable external disturbances. All these uncertain factors will affect the discrete control system. The final control effect of the system has a profound impact. In addition, with the increasingly complex structure of the actual discrete control system, a large time...

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Problems solved by technology

[0004] At present, although the sliding mode predictive control method has become a feasible method to solve the robust control problem of uncertain discrete systems, there is still a lack of in-depth research and application for systems with time delay problems.

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