The single-point electromagnetic levitation system is the primary control unit of the electromag-netic suspension maglev trains.Aiming at the problem of system control performance degradation due to the influence of strong disturbances in single-point electromagnetic suspension systems,an improved line-ar active disturbance rejection control(LADRC)method was proposed.Firstly,based on the structure and principle of electromagnetic levitation,the linear model of the single-point levitation system was es-tablished and the stability of the system was analyzed.Secondly,the position outer loop controller based on active disturbance rejection control method and the current inner loop controller based on PI regulator were designed.After that,the linear extended state observer was improved,and a two-stage cascaded linear extended state observer was designed to improve the accuracy and speed of disturbance estimation,so as to improve the disturbance estimation ability of the extended state observer in the system.The ad-vantages of the improved LADRC in disturbance estimation performance and inhibition ability were ana-lyzed in the frequency domain.Finally,an experimental environment was constructed to test effectiveness of the improved linear active disturbance rejection control method.The experimental results indicate that the proposed improved LADRC not only has good position tracking performance,but also has stronger an-ti-interference capability compared with the conventional LADRC.
关键词
单点电磁悬浮系统/线性自抗扰控制/级联扩张状态观测器/观测精确度/频域分析/抗扰性能
Key words
single-point electromagnetic levitation system/linear active disturbance rejection control/cascaded extended state observer/observation precision/frequency domain analysis/disturbance rejec-tion performance
维普
万方数据