Anti-disturbance tolerant control for attitude control systems under complete loss of wheel effectiveness

This paper concerns the complete loss of reaction wheel effectiveness problem for the attitude control system of microsatellites. An anti-disturbance tolerant control method with disturbance rejection and compensation is presented. Due to the complete loss of reaction wheel effectiveness, four reaction wheels are applied for attitude control, which not only considering the external environment disturbance torque for satellite orbiting, but aslo considering the lower attitude control accuracy resulted by flexible component vibration. An anti-disturbance tolerant controller with disturbance attenuation and rejection is designed based on a disturbance observer. The controller can be easily solved via convex optimization based on linear matrix inequality. The simulation results demonstrate that the fault can be tolerant controlled and the disturbances can be rejected and attenuated simultaneously.