Fault-tolerant control method for networked system with partial decoupling disturbance

Abstract

The invention discloses a fault-tolerant control method for a networked system with partial decoupling disturbance, and belongs to the field of networked systems. The method comprises the following steps of: firstly, converting an original system into a state augmentation system equivalent to the original system through model conversion; and then under the condition of considering random loss of measurement data, constructing an unknown input observer to realize joint estimation of a system state and a fault, and designing a fault-tolerant control law based on signal compensation to realize active fault-tolerant control of an original system based on online estimation values of the state and the fault, in the fault-tolerant control algorithm, existence conditions of gains of the observer and the controller can be obtained by performing stochastic analysis on an error system by using a Lyapunov stability theory, and corresponding parameters of the estimator and the controller can be obtained by solving a matrix inequality with convex constraints on line; and finally, verifying the effectiveness of the fault-tolerant control method through a simulation example of a jet engine model.

Description

technical field [0001] The invention belongs to the field of networked systems, and relates to a fault-tolerant control method for a networked system with partial decoupling disturbances. Background technique [0002] With the improvement of industrial automation and the development of technology in the field of intelligent manufacturing, the trend of high integration of control systems and communication networks is becoming more and more obvious. The closed-loop feedback control system formed by interaction, because of its low cost, simple installation, and convenient maintenance, has received continuous attention from scholars at home and abroad in recent years, and has been widely used in many practical engineering fields. [0003] However, in practical applications, the introduction of communication networks not only increases the flexibility and convenience of expansion of the system, but also brings new challenges to the analysis and design of the system, such as packe...

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Problems solved by technology

[0003] However, in practical applications, the introduction of communication networks not only increases the flexibility and convenience of expansion of the system, but also brings new challenges to the analysis and design of the system, such as packet loss, transmission delay, quantization error and network Attacks, etc. On the other hand, due to the gradual increase in the scale and complexity of modern industrial systems, the probability of system failures is also increasing. If any small or potential failures occur in such complex large systems, if they cannot be diagnosed and Effective treatment may trigger a chain reaction until the system crashes, and even lead to catastrophic consequences. At this time, a common method to solve this series of problems is to construct a suitable fault-tolerant control law to ensure that the system can still operate stably under fault conditions .

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