Research On Satellite Attitude Control With Solar Array Based On Variable Parameter Model

With space missions make varied, not only the satellite payloads need more and more energy, but also the demand for the attitude maneuver accuracy, stability, and maneuvering time of the satellite are higher and higher. For that reason, how to improve the energy conversion efficiency of the solar panel and how to deal with the coupling between the attitude control of the satellite and the flexible structure is crucial. Under this background, this paper studies the control problem of the attitude stability of the satellite with the solar panel and the solar array drive assembly driving smoothly in the process of sun-tracking carefully in multiple perspectives.Firstly, this paper studying the dynamic model of flexible satellites and the solar panel driving mechanism model, and considering the interference caused by the solar array drive assembly and system uncertainty, establishes a variable parameter model of the satellite with flexible solar panel. For the control problem of the attitude stability of the satellite with the solar panel and the solar array drive assembly driving smoothly in the process of sun-tracking, proposes a PD control method based on output feedback, and it is pro ved that the control law is stable in the Lyapunov sense. According to the dynamics parameters of the meteorological satellite announced by GOES-8, the simulation results show that under PD control, the rotation velocity of the solar panel has obvious oscillation. It do not meet the requirements of the solar array drive assembly driving smoothly. So, to solve this problem, a new method of compound control is proposed in this paper. The control of satellite attitude stability is used by the sliding mode variable structure control in order to solve the interference caused by the solar array drive assembly and system uncertainty. Because the sliding mode variable structure control have a complete robustness for external disturbance and satisfy the parameter unc ertainty on the matching condition. And on this basis, designing the adaptive compensation of motor current drive of the step to overcome the effect on friction torque and harmonic torque of the solar array drive assembly Similarly, taking GOES-8 as the object of simulation, this paper compares with three groups of simulation, namely the attitude sliding mode variable structure control + the solar array drive assembly adaptive control, the attitude PD control + the solar array drive assembly adaptive control and the attitude sliding mode variable structure control + the solar array drive assembly PD control, to verify the validity of the sliding mode variable structure + the solar array drive assembly adaptive control system, greatly improve the accuracy of satellite attitude control and stability and improve the array of directional accuracy.