Harmonic current suppression method based on virtual sampling second-order repetitive control

Abstract

The invention discloses a harmonic current suppression method based on virtual sampling second-order repetitive control. The method comprises the following steps: firstly, establishing a magnetic suspension rotor kinetic model containing mass imbalance and sensor harmonic waves; secondly, using virtual sampling to ensure that the ratio of a disturbance basic period to a sampling period is an integer under the condition that the physical sampling frequency is not changed, enhancing the robustness of the system through second-order repetitive control, and keeping a good suppression effect when the frequency fluctuates to a certain extent; and a novel stability analysis method is provided for solving the problem that the high-order repetitive control stability is difficult to prove. Accordingto the virtual sampling second-order repetitive controller, the robustness of the system is improved by changing the implementation mode of unit delay, the virtual sampling second-order repetitive controller is suitable for harmonic current suppression of the magnetic suspension rotor with mass imbalance and sensor harmonic waves, a novel stability analysis method is provided, and the calculatedamount is reduced to a great extent.

Description

technical field [0001] The invention relates to the technical field of harmonic current suppression of magnetic suspension rotors, in particular to a harmonic current suppression method based on virtual sampling second-order repetitive control, which is used for suppressing harmonic currents in a magnetic suspension control torque gyro rotor system. The application of control moment gyroscope on agile maneuvering satellites and large space stations provides corresponding technical support. Background technique [0002] The rotor system of the magnetic levitation control torque gyro has many advantages such as zero friction, no lubrication, high speed and long-term service, and has an active magnetic bearing, so the damping and stiffness can be adjusted. And the magnetic bearing control loop can realize the active suppression of harmonic vibration by inserting the vibration control algorithm, avoiding the problem that the vibration isolation device occupies extra space and in...

AI Technical Summary

Problems solved by technology

However, traditional repetitive controllers are prone to performance degradation when the ratio of the disturbance signal period to the sampling period is not an integer, and when the signal frequency deviates due to rotational speed measurement errors or processor clock error drift, it is easy to weaken the suppression of traditional repetitive controllers. Effect

In addition, the stability proof for high-order repetitive control will be very complicated if the minimum gain theory is continued

If the above problems are not solved, then the magnetic levitation control moment gyro will easily affect the normal and stable operation of the ultra-quiet satellite platform due to the lack of better suppression of vibration.

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