Research On Hybrid Excitation Maglev System Control

Today’s urbanization is changing with each passing day,and the carrying capacity of land and transportation in large cities is overwhelmed.Maglev trains have received increasing attention due to their low noise,zero emissions and low construction costs.However,during long-term operation,the train is susceptible to system parameter changes and external disturbances,and the result will result in a significant drop in control performance.Therefore,the magnetic levitation control technology is related to the safety of trains and passengers,and is the top priority in the research field of maglev trains.Based on the above factors,this paper takes the hybrid excitation mechanism of medium and low speed maglev train as the research object,and studies the hybrid excitation suspension control system.The work of the thesis focuses on hybrid excitation suspension control,which involves system modeling,control algorithm research,and preliminary design of hardware platform.Firstly,the hybrid excitation single magnet single iron is analyzed in detail,and the noulinear mathematical model of the suspension system is established.Then the feedback linearization theory is discussed and the classical feedback linearization control system of hybrid excitation suspension is established.In this paper,the tangential processing of the feedback linearization method is used to derive the robust feedback linearized magnetic levitation system containing the intermal information of the original system.Then,based on the variation law of the air gap inductance in the suspension motion,the improved system inductance value is proposed.Decoupling feedback linearization method;then,for the influence of linear motor normal force interference,nonlinear disturbance observer is introduced,combined with robust feedback linearization method to improve control performance,enhance system immunity and robustness.Sexual purpose.In order to verify the effectiveness of the proposed algorithm,the parameters that are greatly affected by temperature are the armature winding resistance R,the permanent magnet patch coercive force Hc and the suspended total mass M in the hybrid excitation structure,which are arranged in various combinations.The differences between the various possibilities for the dynamic response of the magnetic levitation control system verify that the proposed algorithm can effectively resist various kinds of matching and mismatching uncertainties inside and outside the system.