Rotor Unbalance Vibration Suppression for MSCMG Using Composite Anti-disturbance Control Method

For the uncertainty of the current stiffness and the unbalanced vibration during the stable operation of the magnetic suspended control moment gyro(MSCMG), the method of composite hierarchical anti-disturbance control(CHADC) is implemented to realize the stability control of the magnetic bearing system. The parameter uncertainty and unmodeled dynamics are attenuated by robust H _∞ controller, when the harmonic disturbances are observed and compensated by disturbance observers. Based on this control framework, this paper proposes a phase compensation method based on tracking differentiator to reduce the influence of switching power amplifier on the design of control system. The observer parameter matrix is adjusted in real time by the speed measurement to achieve unbalanced vibration suppression in the large speed range.