Fault Diagnosis And Fault-tolerantcontrol Of Hybrid System And Its Application In Satellite

Hybrid system was used in practical engineering widely, but at present most of hybrid estimation algorithms exist drawbacks, and little research has been done about fault diagnosis and fault-tolerant control of hybrid system. To solve above problems, hybrid estimation algorithms, fault diagnosis and fault-tolerant control about hybrid system has been researched deeply in this paper, then was applied in satellite attitude control system. The main research content in this paper consists of the components in the following:Establish hybrid system model and research hybrid estimation algorithm. The paper established a stochastic hybrid system model by analyzing and researching methods of modeling and state estimation algorithms for hybrid system, and given a hybrid estimation algorithm based on IMM. The discrete state transition guards depend on continuous state and random parameter.The design of the satellite attitude combined control system of. Based on the study of thrusters and flywheels attitude control system, the thesis proposed the combined control strategy, which is based on stochastic linear hybrid system model and apply thruster-flywheel combined actuator.Fault diagnosis and fault-tolerant control of hybrid system. This paper proposed the method of diagnosing continuous fault using continuous state residuals, and diagnosing discrete fault using the estimated value of continuous state and the probability of discrete state. For continuous fault, the paper designed a reconfigurable controller based on eigenstructure assignment (EA) method. For discrete fault, this paper proposed the method of adaptive adjustment discrete state transformation rules.The design of fault diagnosis and fault-tolerant control of satellite attitude combined control system. Based on presented fault diagnosis and fault-tolerant control method of hybrid system, this paper proposed the fault diagnosis approach and the fault-tolerant control strategy for satellite attitude combined control system.