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Fault-tolerant control method for discrete integral sliding mode of satellite control system

A technology of satellite control system and integral sliding mode, which is applied in attitude control and other directions, can solve problems such as multiple faults and inaccuracy, and achieve the effect of increasing calculation speed

Active Publication Date: 2014-04-02
BEIJING INST OF CONTROL ENG
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to design a satellite fault-tolerant control method based on discrete integral sliding mode fault-tolerant control, online identification of health factors and control distribution. Satellite Attitude Control Problem with Two Uncertainties Existing Simultaneously

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  • Fault-tolerant control method for discrete integral sliding mode of satellite control system
  • Fault-tolerant control method for discrete integral sliding mode of satellite control system
  • Fault-tolerant control method for discrete integral sliding mode of satellite control system

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Embodiment Construction

[0022] like figure 1 As shown, for satellites in orbit, the fault-tolerant control method mainly consists of three parts, namely, the control algorithm of the controller, the control allocation algorithm and the fault diagnosis parameter identification algorithm. The control algorithm of the controller can use the virtual control law to generate the control signal v according to the measured output z. The control distribution algorithm realizes the distribution of the virtual control law designed by the controller to the actuators, and the sum of the effects provided by each actuator can obtain the control effect required by the satellite control. The control distribution algorithm can obtain the output signal u of each actuator according to the control signal v and the health factor W obtained by identification of fault diagnosis parameters. The fault diagnosis parameter identification algorithm is an important part of the active fault tolerance algorithm. The fault diagnosi...

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Abstract

The invention discloses a fault-tolerant control method for a discrete integral sliding mode of a satellite control system. A discrete integral sliding mode controller is designed based on the discrete linear system mode of a satellite, the virtual control law of the controller obtains a health factor W of an actuator through fault diagnosis and parameter identification; adopting a direct distribution method based on the reachable set of a moment to obtain the control moment uk of each actuator according to the controlling quantity vk and the health factor W of the actuator; and arranging the surfaces of reachable sets according to the sequence of angles between a surface normal vector and a target vector from small to large through the direct distribution method based on the reachable set of the moment. According to the method, the satellite attitude control problems of coexisting inaccurate health factors, multiple faults and multiple uncertainties can be effectively processed on line.

Description

technical field [0001] The invention relates to a discrete integral sliding mode fault-tolerant control method for a satellite control system with matching and non-matching uncertainties. Background technique [0002] In order to ensure the high reliability of the satellite control system in the process of operation, it is generally necessary to design sufficient redundancy for key components, so that after the system fails, after diagnosis, isolation and reconstruction, healthy actuators and corresponding control algorithms can be used to control the satellite control system. gesture control. When some actuators do not fail completely, the faults only affect the output efficiency, and when there are no other resources available, the appropriate control algorithm can use these faulty actuators to realize the attitude control of the satellite. In addition, due to the influence of many unknown factors such as interference and modeling uncertainty, the spacecraft control algor...

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Application Information

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IPC IPC(8): G05D1/08
Inventor 王大轶段文杰刘成瑞何英姿
Owner BEIJING INST OF CONTROL ENG
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