Magnetic suspension flywheel buffeting weakening method based on sliding mode variable structure control

Abstract

The invention discloses a magnetic suspension flywheel buffeting weakening method based on sliding mode variable structure control; the method uses a generalized description function method of a sliding mode variable structure control system and an adaptive unscented Kalman filtering algorithm to weaken signal buffeting, takes buffeting imported by the variable structure control and the system stability design as research objects, starts from variable structure control buffeting inhibition and present conditions and existing problems of a DF method applied in a non-linear system, emphasizes onstability analysis of a frequency correlation description function N (A, [omega]) and a variable structure switching gain adaptive adjusting method, proposes the adaptive unscented Kalman filtering (AUKF) algorithm, and designs a H[delta] sliding mode controller based on gain scheduling, thus verifying the validity of the proposed buffeting adjusting and inhibition method. The method ensures thesliding mode variable structure control method not to be sensitive to extraneous disturbances, can ensure an excellent robustness, and can effectively weaken system buffeting caused by continuously switching of the flywheel structure.

Description

technical field [0001] The invention belongs to the technical field of flywheel control, and in particular relates to a method for weakening chattering of a magnetic levitation flywheel based on sliding mode variable structure control. Background technique [0002] As the complexity of the control object increases, the range of system parameters becomes larger, the number of interference sources increases, and the environment is complex, it is very difficult to accurately describe the system model. Taking the magnetic levitation flywheel battery for vehicles as an example, the basic vibration of the rotor system can be effectively suppressed by using the sliding mode variable structure. In recent years, the robust control theory of uncertain systems has achieved good results, but the robust stability limits the bandwidth of the closed-loop system and reduces its interference. In order to enhance the control of robust uncertain factors, the nonlinear feedback control of slid...

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Problems solved by technology

Although these two methods can effectively weaken the chattering caused by the high-frequency switching of the control law, they have a large amount of calculation and are difficult to apply in the real-time control system.

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