Abstract: The Control Moment Gyroscope (CMG) frame servo system is often affected by multi source disturbance such as external disturbance and internal parameter perturbation, which leads to the reduction of its control performance. This paper focuses on the influence of parameter perturbation on the frame servo system, and puts forward a perturbation suppression method for CMG frame servo system based on H2/H∞ composite control. Firstly, the motor parameter perturbation is introduced into the conventional H∞ robust control method, which improves the suppression ability of the internal parameter perturbation on the basis of the robustness of external torque perturbation. Secondly, combined with the H2 control strategy, the state feedback based H2/H∞ composite control method is proposed, which ensures the steady state performance and further improves the dynamic response speed of the system. Simulation results show that the proposed H2/H∞ composite control method can effectively reduce the speed fluctuation caused by multisource disturbances and improve the dynamic response speed of the system.

Key words: CMG frame servo system, H2/H∞ hybrid robust controller, parameter perturbation, multi source disturbance suppression