Robust fault-tolerant attitude control for satellite with multiple uncertainties and actuator faults

• 作者: Liming FAN Hai HUANG Kaixing ZHOU
• 来源期刊: 中国航空学报（英文版）
• 年，卷（期）: 2020,（12）
• 所属期刊栏目: Electronics and Electrical Engineering and Control
• 页码范围: 3380-3394
• 页数: 15页
• 语种: 英文

摘要

In this paper, the satellite attitude control system subject to parametric perturbations, external disturbances, time-varying input delays, actuator faults and saturation is studied. In order to make the controller architecture simple and practical, the closed-loop system is transformed into a disturbance-free nominal system and an equivalent disturbance firstly. The equivalent disturbance represents all above uncertainties and actuator failures of the original system. Then a robust con-troller is proposed in a simple composition consisting of a nominal controller and a robust compen-sator. The nominal controller is designed for the transformed nominal system. The robust compensator is developed from a second-order filter to restrict the influence of the equivalent dis-turbance. Stability analysis indicates that both attitude tracking errors and compensator states can converge into the given neighborhood of the origin in finite time. To verify the effectiveness of the proposed control law, numerical simulations are carried out in different cases. Presented results demonstrate that the high-precision attitude tracking control can be achieved by the proposed fault-tolerant control law. Furthermore, multiple system performances including the control accu-racy and energy consumption index are fully discussed under a series of compensator parameters.