Study on Smith Predictive Linear Active Disturbance Rejection Control of the Electromagnetic Levitation System with Time Delays
Time delays(TDs)in the active electromagnetic levitation system significantly affect the run-ning stability and ride comfort of Maglev trains,so it is a critical issue for the technical reform of the speed-up electromagnetically suspended Maglev trains.In this paper,a Smith predictor is employed to compensate for the TD in the electromagnetic levitation system.Simultaneously,a linear active disturb-ance rejection controller(LADRC)is introduced to estimate and compensate for the errors between the predicted TD and actual TDs as internal disturbances.In this way,we developed a Smith-LADRC levita-tion controller with the time-delay compensation and active disturbance rejection capabilities.Subse-quently,vertical dynamic response of maglev vehicles adopting respectively PID,LADRC,Smith-PID,and Smith-LADRC control algorithm are simulated,and the TD thresholds for stable levitation are com-pared.The results confirm that the Smith-LADRC levitation controller exhibits the stronger time-delay compensation and anti-disturbance capabilities.Finally,the influence of Smith-LADRC controller pa-rameters on dynamic performances of maglev vehicle is investigated.By balancing the TD stability mar-gin and the fluctuation amplitude of levitation gap,optimal ranges for the controller bandwidth,the ob-server bandwidth and the controller gain of LADRC are presented.
Maglev trainelectromagnetic suspensiontime delay systemSmith predictorac-tive disturbance rejection control
万方数据
维普
