High frequency disturbance torque control strategy for SGCMG gimbal servo system

Deficient capability of high frequency disturbance torque attenuation restricts further improvements on the speed control performance of single gimbal control moment gyro (SGCMG) gimbal servo system. In this paper, a variable structure controller (VSC) combined with repetitive controller (RC) is proposed. Utilizing the characteristics of invariance and fast response of VSC and the characteristics of infinite gain at designated frequency of RC, high precision control was realized under the condition of high frequency disturbance torque fluctuations. Simulation results show that the proposed method is feasible and efficient. Comparing to proportional integral derivative (PID) controller, the speed fluctuating quantity decreases from 10% to 2%.