Research On The Influence Of Electrical Parameters Of Traction Drive System On Vehicle Dynamics

In recent years,along with the rapid development of train technology in our country,the running speed of trains is getting faster and faster.Compared with the low-speed operation,the dynamic characteristics of the vehicle running at high speed have undergone great changes,Such as the interaction between the wheel and rail vehicle,the impact of the traction motor rotor vibration on the vehicle,traction LC system and the LC resonant branch of the support capacitance capacity of the motor output torque and so on.These impacts will pose a number of challenging issues for the stability of high-speed trains and the effectiveness and safety of traction braking.The research background of this article comes from the project of "National Natural Science Foundation of China," "Nonlinear dynamic characteristics of transmission system on the dynamic performance of high-speed trains and control research." Traction drive train system itself is a complex electromechanical coupling system,in which traction converter is an important part of the transmission system.At high speed,the LC resonant branch of the DC link and the capacity of the supporting capacitor affect the output torque of the traction motor of the transmission system to a certain extent,which in turn has an impact on the dynamic performance of each component of the vehicle.In this paper,the traction converter of a train traction system will be the main research object.The working principle and control strategy of the key components in the traction drive system and the selection of the LC resonant branch and the support capacitor capacity in the intermediate DC link will be used to evaluate the dynamic performance of the vehicle The impact of in-depth research and analysis.First of all,this paper introduces the composition and working principle of the traction drive system in detail,analyzes and calculates the selection range of the inductance parameters on the grid side of the drive converter in this study,and separately supports the capacity of the intermediate support capacitor with or without LC resonant branch Analysis and calculation,to determine the range of capacitance values for the back of the simulation provides a theoretical basis.Secondly,this paper introduces the basic working principle of the grid-side converter and traction inverter in detail,analyzes the control strategy of the converter,and based on the transient direct current control method,Of the DC voltage supply to the traction inverter;According to the coordinate transformation theory and vector control theory set up a traction inverter in detail,analyzes the control strategy of the converter,and based on the transient direct current control method,Of the DC voltage supply to the traction inverter;According to the coordinate transformation theory and vector control theory set up a built-in inverter-induction motor vector control model,completed the network measurement rectifier-DC link-inverter induction motor telex system Simulation studies and analysis of the intermediate circuit LC and support capacitance of the different parameters of the choice of motor output torque.Finally,a single-vehicle dynamics model was built and packaged in Simpack software,and the simulation model was co-simulated with the control model of traction drive system in Matlab / Simulink analysis software to compare the capacitance capacity under resonant branch The choice of dynamic response of the various components of the vehicle.LC resonant branch of the main role is to filter out voltage ripple to make the transmission system more stable,cancel the LC resonant branch,within the feasible range to increase the amount of support capacitance to stabilize the voltage and the motor output torque in this case the vehicle The acceleration vibration frequency peaks of the components are reduced.At the same time,the LC resonance circuit was considered in the simulation study.The influence of different capacitances on the output torque of the transmission system motor was compared and analyzed to further analyze the dynamic response of the vehicle components.