Electromechanical Coupled Vibration And The Suppression Strategy In Traction Drive System Of High-Speed Train

In high-speed train,traction drive system is a typical electromechanical coupling system,torsional vibration can be easily happened due to the fluctuation of speed and torque,which affect the operation quality of train.The paper pays attention to the electromechanical coupling vibration phenomenon,and analyzes the vibration mechanism and the parameter influence degree,then propose an effective suppression strategy.Firstly,based on the characteristic of traction drive system,this paper establishes a two-mass model,a bending-torsion coupled vibration model considers elastic suspension of gearbox,and an electromechanical coupling model combines motor vector control,deeply analyzes vibration performance of driving device,then analyze the vibration mechanism by deducing the system transfer function and zero-pole map.Secondly,the electromechanical coupling vibration simulation model is established on the basis of actual parameter of high-speed train,the result shows that the system will vibrate in natural vibration frequency of driving device when there exists disturbance(such as step),mainly for device vibration,fluctuation of speed and electrical oscillation.Then the author explores parameters influence degree includes inertia,speed controller and current PI parameters according to the pole-zero map.Thirdly,the paper adopts resonant controller to suppress the electromechanical coupling vibration,meanwhile design a frequency extraction algorithm in consideration of uncertainty and randomness of parameters to automatically set the resonant frequency of controller.Moreover,author adopts an effective suppression strategy of parallel resonant controllers although there have multiple resonance frequency in traction drive system.Finally,the author analyzes the natural vibration frequency of driving device in high-speed train,and the test result coincides with theoretical calculations.A 1.1kW experimental platform is established to represent the shaft torsional vibration,which proves the parameter influence and achieves the effect of suppression strategy.