Research On Dynamic Performance And Active Control Strategy Of High-Speed Pantograph-Catenary System

ABSTRACT:With the development of high-speed railway in China, The current collection system should provide an uninterrupted current flow from the catenary system to the train set. Because the electrical power supply of railway, the interaction of the overhead wire with the collectors and the pantograph determines the reliability and quality of the energy supply. When train speeds are to be increased high-speed, the energy transmission is one factor that limits the maximum speeds achieved. The pantograph-catenary system is supposed to supply energy to the train set via continuous electrical and mechanical contact, i.e. without interruptions, while simultaneously keeping the wear on the contact wire and the collector strips as low as possible. The variation of catenary-pantograph system, especially at high speed, undesirable dynamic behavior of both the wire and the pantograph is produced. All these requirements are to some extent conflicting:the limitation of wire uplift and mechanical wear (i.e. wear due to friction) requires a low value of contact force, while avoiding contact losses, minimization of electromagnetic disturbances related to sparking and wear due to arcing require an increase of average contact force. The effective method to solve the problem is to improve the dynamic performances of the pantograph-catenary system. Therefore, the purpose of this dissertation is to provide model and method to analyse the current collection performance of high-speed railway and to provide design reference to reduce losses of large dynamic vibration for catenary-pantograph system. The active high-speed pantograph is proposed to improve the performance of current collection system based on the constructed catenary. The variation of contact force will be properly small and reduce the wear of contact line and carbon.The project is supported by China Railway Ministry. The project is key components of high train set and high power AC drive locomotive's innovation, introduction, domestic absorption-the design introduction and test standards of train set and high power AC drive locomotive pantograph (2006J023-D).An integrative model of catenary-pantograph system including linear and nonlinear pantograph, linear and nonlinear pneumatic cylinder, infinite string and lumped mass catenary-pantograph model, nonlinear FEM catenary-pantograph model and aerodynamic of high-speed pantograph and wing is established according to the construction of current collection system. The applied area and solved problems are discussed. It is proposed high-speed pantograph-catenary system parameter calculation, double pantograph current collection calculation method considering the catenary propagation, high speed pantograph-catenary dynamic interaction simulation method considering nonlinear friction and contact, and aerodynamic of high-speed pantograph computation and simulation. The high-speed pantograph-catenary system computation and simulation platform is trying to establish. The main work of this dissertation is summarized as follows:(1) The natural frequency of catenary and pantograph is obtained and analysed the influence parameter according to vibration modes by using modal analysis and geometric relationship. The calculation results are used to provide reference for experimental test.(2) The contact line propagation is considered in infinite string and lumped mass catenary-pantograph model. Harmonic analysis method is used to solve the model which takes the catenary sag, stiffness, propagation and the carbody vibration into account and considers its' influence on the vertical displacement variation of contact point. The distance of two pantographs when running with two pantographs in the train set is investigated here. And the importance of the pantograph apparent mass is also discussed.(3) The comparison analysis of simple suspension and stitched suspension is done by using FEM simulation model. The contact line tension force, messenger tension force, stiffness of pantograph head and frame are considered in coupled FEM model. Optimizing the parameter of the pantograph-catenary system based on the simulation results is investigated. The Marc simulation results compared with Jing-Jin experiment data and Siemens simulation data verify the FEM model.(4) Based on the pantograph model with air wing, the force applied on the pantograph is adjusted by correcting the uplift force. The aerodynamic dynamic performance of high-speed pantograph is analysed. The uplift force applied on the pantograph head due to the wing angle variation is calculated based on plate aerodynamic method.(5) The dual-loop active control applied on high-speed pantograph is proposed based on pneumatic cylinder and wing calculation results. The fuzzy Bang-Bang control scheme is applied on the pantograph wing and the Bang-Bang control is applied on the pneumatic cylinder and verified the control effect according to the FEM simulation method. The results and conclusion obtained in this dissertation can provide the design references for high-speed catenary-pantograph system. According to the models and calculating method presented in this dissertation, the performance of catenary-pantograph system is analysed and active control measures is adopted to improve the interaction between the catenary and pantograph.