Second-order-odd-repetitive-controller-based odd harmonic current suppression method of magnetic levitation rotor

Abstract

The invention discloses a second-order-odd-repetitive-controller-based odd harmonic current suppression method of a magnetic levitation rotor. A magnetic levitation rotor kinetic model including rotor mass unbalance and sensor harmonic is established; and a second-order-odd-repetitive-controller(SOORC)-based odd harmonic current suppression method of a magnetic levitation rotor is employed. The SOORC has a second-order inner membrane structure for odd harmonic frequency suppression, so that the harmonic suppression capability on a harmonic frequency changing or uncertain condition can be improved and thus the control robustness of the system for the harmonic frequency changing or uncertain condition can be improved. With phase hysteresis-lead compensation, the steady performance and dynamic performance of the system are improved, so that odd harmonic current components generated by a magnetic bearing coil in a magnetic levitation rotor can be suppressed. The method is suitable for suppression of odd harmonic current components of the magnetic levitation rotor system with rotor mass unbalance and sensor harmonic.

Description

technical field [0001] The invention relates to the technical field of magnetic suspension rotor harmonic current suppression, in particular to a magnetic suspension rotor odd harmonic current suppression method based on a second-order odd repetition controller, which is applied to the harmonic current suppression in the magnetic suspension control torque gyro rotor system , to provide technical support for the application of maglev control moment gyro on the "ultra-quiet" satellite platform. Background technique [0002] The stable suspension of the rotor in the Control Moment Gyroscope (CMG) is realized by using the electromagnetic force of the magnetic bearing, and there is no contact friction between the rotor and the stator of the magnetic bearing. Therefore, compared with traditional mechanical bearings, magnetic bearings have many advantages: first, because there is no contact friction between the rotor and stator of magnetic bearings, the rotor speed of CMG flywheel ...

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Problems solved by technology

However, the parallel multi-notch filter algorithm cannot achieve simultaneous suppression of all vibrations and has a large amount of calculation. At the same time, the convergence speed between different filters needs to be considered, and the design is relatively complicated; the repeated control RC algorithm can be realized without multiple filters in parallel. Simultaneous suppression of vibrations of different frequency components

The repetitive control RC algorithm is a method to achieve zero static error of the system based on the internal model principle, while the existing repetitive control algorithms applied to the magnetic levitation rotor system are all based on the internal membrane structure design under the condition that the harmonic current frequency is accurately determined. It does not consider the attenuation of the harmonic current suppression effect when the harmonic current frequency changes or is uncertain

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