Position Precision Control of Magnetic Levitation Systems Based on Generalized Multiple Disturbances Estimation and Compensation

This paper presents a generalized multiple disturbances estimation and compensation based position precision control of maglev systems, especially for the estimation and compensation of the unknown periodic disturbance. In order to accurately track the periodic reference and estimate the periodic disturbance, the internal model of periodic signals is embedded into the design of the generalized disturbance estimator (GDE) and the outer-loop controller, respectively. Meanwhile, the adaptive period estimator (APE) is designed to ensure the good estimation accuracy of the periodic disturbance when the period of the disturbance varies in a small range. Then, the disturbance estimate and its derivatives are introduced into the control law, and the disturbance compensation gain are designed to eliminate the influence of mismatched disturbances on the output. Finally, the stability and anti-disturbance performance of the proposed method are analyzed, and the effectiveness of the proposed method is verified by simulation and experiment.

Automated summary

This paper presents a generalized multiple disturbances estimation and compensation based position precision control of maglev systems, especially for the estimation and compensation of the unknown periodic disturbance. The internal model of periodic signals is embedded into the design of the generalized disturbance estimator (GDE) and the outer-loop controller, respectively, in order to accurately track the periodic reference and estimate the periodic disturbance. The proposed method ensures good estimation accuracy of the periodic disturbance and eliminates the influence of mismatched disturbances on the output through the introduction of disturbance estimate and its derivatives into the control law and the design of disturbance compensation gain.