高速铁路牵引网建模与仿真
发布时间：2018-09-18 20:23
【摘要】：为满足我国社会经济的不断发展需求,结合我国是内陆大国、人口众多、对交通运输需求极大的基本国情,并且随着国家对铁路建设力度的不断加大,近年来高速铁路得到迅速的发展。从牵引供电系统来看,牵引变压器、牵引网、动车组和综合接地系统等设备构成了一个完整封闭的能量流动系统,牵引网作为该能量流动系统的重要组成部分,对高速铁路的安全稳定运行起到举足轻重的作用。因而,提取精准的牵引网电气参数并且建立精确的牵引网模型意义重大。 文中针对高速铁路普遍采用的全并联AT供电方式,结合牵引网的多导体传输线特性和分布参数特性建立链式网络模型。求解每隔1km切割后的串联子网的阻抗矩阵和导纳矩阵。为解决传输线数目多且复杂的问题,将牵引网的多条传输线等效为]0根导线,推导了多导线的等值简化方法。 在利用Carson公式对牵引网电气参数进行计算的基础上,分别采用不同的方法提取特殊导线电气参数。针对钢轨和接触线截面形状的不规则性和磁化特性的复杂性,利用电磁场有限元方法对其进行分析,较为精确地求解了它们的内阻抗、对地电容,从而可以精确的计算导线的内阻抗、互阻抗等；讨论了贯通地线阻抗的求解方法。采用了四周无限隧道模型对隧道中导线参数进行求解,计算隧道中导线的自阻抗、互阻抗和分布电容。此外,还通过研究高架桥的电气参数,求得了供电回路和桥墩之间的耦合系数。 在Simulink仿真平台里搭建了牵引网仿真模型,通过分析牵引网短路阻抗特性并且实现牵引网短路阻抗仿真,验证了所建立的牵引网数学模型的正确性。搭建CRH3型动车组模型,动车组模型的整流器和逆变器分别采用瞬态直接电流控制和间接转矩控制的控制策略,通过对车载牵引变压器、脉冲整流器、中间直流回路、PWM逆变器和异步牵引电机的输出电气量的分析,可以看出该电路模型能够较好的表征CRH3型动车组的非线性特征。 实现了高速铁路牵引网与CRH3型动车组的联动仿真,同一供电臂下动车组不同位置时牵引网电压和钢轨电位分布的仿真,动车组位置固定且处于不同路段时牵引网钢轨电位分布的仿真,从而研究了在加入非线性负荷后牵引网的电气特性。
[Abstract]:In order to meet the social and economic development needs of our country, China is a large inland country with a large population and a great demand for transportation, and with the increasing intensity of railway construction in our country, In recent years, high-speed railway has been developed rapidly. From the point of view of traction power supply system, traction transformer, traction network, EMU and integrated grounding system constitute a complete closed energy flow system, traction network as an important part of the energy flow system, It plays an important role in the safe and stable operation of high speed railway. Therefore, it is of great significance to extract accurate electrical parameters of traction network and establish accurate traction network model. Aiming at the all-parallel AT power supply mode widely used in high-speed railway, a chain network model is established combining the characteristics of multi-conductor transmission lines and distributed parameters of traction network. The impedance matrix and admittance matrix of the series subnet after each 1km cut are solved. In order to solve the problem that the number of transmission lines is large and complex, the multiple transmission lines of traction network are equivalent to] 0 conductors, and the equivalent simplification method of multiple conductors is deduced. Based on the calculation of the electrical parameters of traction network by Carson formula, different methods are used to extract the electrical parameters of special conductors. In view of the irregularity of rail and contact line section shape and the complexity of magnetization characteristics, the finite element method of electromagnetic field is used to analyze them, and their internal impedance and earth capacitance are solved accurately. Therefore, the internal impedance and mutual impedance of the conductor can be accurately calculated, and the solution method of the penetrating earth wire impedance is discussed. The parameters of the traverse in the tunnel are solved by the infinite tunnel model, and the self-impedance, mutual impedance and distributed capacitance of the conductors in the tunnel are calculated. In addition, the coupling coefficient between the power supply circuit and the pier is obtained by studying the electrical parameters of the viaduct. The simulation model of traction network is built on the Simulink platform. By analyzing the characteristics of short circuit impedance of traction network and realizing the simulation of short circuit impedance of traction network, the correctness of the established mathematical model of traction network is verified. The rectifier and inverter of CRH3 type EMU model adopt the control strategy of transient direct current control and indirect torque control, respectively, through the vehicle traction transformer, pulse rectifier, By analyzing the output electrical parameters of the intermediate DC loop PWM inverter and asynchronous traction motor, it can be seen that the circuit model can well characterize the nonlinear characteristics of the CRH3 EMU. The simulation of high-speed railway traction network and CRH3 EMU is realized, and the simulation of traction network voltage and rail potential distribution in different positions under the same power supply arm is realized. The simulation of rail potential distribution of traction network with fixed position of EMU and different sections of road is carried out to study the electrical characteristics of traction network after adding nonlinear load.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U224
本文编号：2249013
[Abstract]:In order to meet the social and economic development needs of our country, China is a large inland country with a large population and a great demand for transportation, and with the increasing intensity of railway construction in our country, In recent years, high-speed railway has been developed rapidly. From the point of view of traction power supply system, traction transformer, traction network, EMU and integrated grounding system constitute a complete closed energy flow system, traction network as an important part of the energy flow system, It plays an important role in the safe and stable operation of high speed railway. Therefore, it is of great significance to extract accurate electrical parameters of traction network and establish accurate traction network model. Aiming at the all-parallel AT power supply mode widely used in high-speed railway, a chain network model is established combining the characteristics of multi-conductor transmission lines and distributed parameters of traction network. The impedance matrix and admittance matrix of the series subnet after each 1km cut are solved. In order to solve the problem that the number of transmission lines is large and complex, the multiple transmission lines of traction network are equivalent to] 0 conductors, and the equivalent simplification method of multiple conductors is deduced. Based on the calculation of the electrical parameters of traction network by Carson formula, different methods are used to extract the electrical parameters of special conductors. In view of the irregularity of rail and contact line section shape and the complexity of magnetization characteristics, the finite element method of electromagnetic field is used to analyze them, and their internal impedance and earth capacitance are solved accurately. Therefore, the internal impedance and mutual impedance of the conductor can be accurately calculated, and the solution method of the penetrating earth wire impedance is discussed. The parameters of the traverse in the tunnel are solved by the infinite tunnel model, and the self-impedance, mutual impedance and distributed capacitance of the conductors in the tunnel are calculated. In addition, the coupling coefficient between the power supply circuit and the pier is obtained by studying the electrical parameters of the viaduct. The simulation model of traction network is built on the Simulink platform. By analyzing the characteristics of short circuit impedance of traction network and realizing the simulation of short circuit impedance of traction network, the correctness of the established mathematical model of traction network is verified. The rectifier and inverter of CRH3 type EMU model adopt the control strategy of transient direct current control and indirect torque control, respectively, through the vehicle traction transformer, pulse rectifier, By analyzing the output electrical parameters of the intermediate DC loop PWM inverter and asynchronous traction motor, it can be seen that the circuit model can well characterize the nonlinear characteristics of the CRH3 EMU. The simulation of high-speed railway traction network and CRH3 EMU is realized, and the simulation of traction network voltage and rail potential distribution in different positions under the same power supply arm is realized. The simulation of rail potential distribution of traction network with fixed position of EMU and different sections of road is carried out to study the electrical characteristics of traction network after adding nonlinear load.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U224
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