【作者】 李良威；

【导师】 李群湛；

【作者基本信息】 西南交通大学 ， 电力系统及其自动化， 2007， 硕士

【摘要】 近年来国内城市轨道交通得到了蓬勃的发展,直流牵引供电系统的安全可靠运行是整个城市轨道交通安全畅通运行的基础。对于直流牵引供电系统的故障分析及其相关问题的研究具有十分重要的意义本文对我国城市轨道交通大多采用的轴向双分裂式三绕组变压器进行了分析,建立了24脉波整流机组的电路仿真模型,分析其在正常工作和非正常工作状态下的输出外特性,并建立了5～6段折线的整流机组外特性曲线模型,能更真实的逼近整流机组的运行状况。在此基础上提出了综合考虑杂散电流收集网在内的多导线直流牵引供电系统仿真模型,采用集中参数模拟分布式电路,借用有限元模型的分析方法,建立了电力网路的导纳矩阵,将全线牵引网考虑成—完整的动态变化系统,短路电流由牵引网连成一体的所有牵引变电所之间分配,采用稀疏技术的高斯消去法,在采用VC++.Net开发的直流牵引供电仿真系统SimSystem中实现了直流牵引供电系统稳态短路计算。通过上海轨道交通3号线、广州地铁2号线的工程实例分析,验证了本文采用的考虑杂散电流收集网在内的多导线供电系统模型以及整流机组多折线外特性模型的准确性。同时本文通过数值分析和有限元分析方法(Femlab)对牵引网轨道电气参数的集肤效应进行了研究,使用Matlab/Simulink建立暂态短路的电路仿真模型,对整流器出口近端短路故障和远端短路故障进行了仿真研究。更多还原

【Abstract】 In recent years, the domestic Urban railway obtained fast development. Safe and reliable operation of DC traction power supply system are the basis of whole urban railway transit system, it is very important to take research on DC traction power supply system fault analysis and relative problems.This article has analysed the axial double fission type three winding transformers which mostly used to our country Urban railway, established 24 pulse wave rectifier unit’s electric circuit simulation model, and analyzed it’s output external characteristic in the normal work and under the unusual active status, and established 5～6 section of broken line rectifier unit external characteristics models, which is more approach to the rectifier unit the movement condition. Proposed in the inferior foundation the overall evaluation stray currents collection network multi-wire DC power supply system simulation model, uses the lumped parameter to simulate the distributional electric circuit, borrows the finite element model the analysis method, has established the power network admittance matrix, considered the entire line hauling network in an integrity dynamic system, the short-circuit current by tows between all transformer substation which the net is united as one body to assign, used sparse technical with the Gaussian elimination, with VC++.Net, developed Steady-state short-circuit calculation of DC traction supply system in SimSystem. Through the Shanghai Urban railway 3 lines, the Guangzhou subway 2 line project example analyses, confirmed this article that takes into account the stray currents collection network in the multi-wire power supply system model as well as the rectifier unit multi-broken line external characteristic model is accuracy.Simultaneously this article has researched the Skin-effect of the net track electricity parameter through the numerical analysis and finite element analysis method (Femlab),with the Matlab/Simulink established electric circuit simulation model of transition condition short-circuited, and conducted the simulation research to the rectifier exportation remote and far-end short circuit breakdown.更多还原