文档介绍：摘要
随着我国经济的发展,城市轨道交通,尤其是地铁,作为一种交通工具也迅速发展,并被越来越广泛的应用。我国直流牵引供电系统的研制与开发起步较晚,目前还没有厂家进行完善的开发和生产,所以直流牵引供电系统的保护将成为一个研究的热点问题。
本文首先在了解城市轨道交通系统组成和直流牵引供电系统组成的基础上,研究地铁的供电方式、保护原理及实现方式。再通过参数的计算及牵引负荷和牵引网短路电流特性的分析,用MATLABA/SIMULINK中电力系统仿真模块12脉波整流机组和牵引网稳态电流模型,对接触网上不同点的短路电流进行了仿真分析。本文研究了常见的几种馈线保护方法,对这几种保护进行了配置,并研究了故障保护流程。最后,对地铁馈线保护系统系统进行了简单的模块化设计,并简要分析了各模块,使结构更完整。
本文计算了钢轨直流电阻、电感和供电回路外电感等参数,研究了单边供电和双边供电时短路电流的计算。通过对接触网上不同点的短路电流的仿真,更精准的反应了短路后电流暂态过程。
关键词:地铁;直流牵引供电;馈线保护; 整流;短路电流
Abstract
With the development of the national economy, urban rail as a vehicle, especially for subway, had a rapid development, and will be used more and more widely. It is to late to study and develop the protection for DC traction power supply system in China, there is no manufacturer which has the ability to make it. So, the protection for DC traction power supply system will e a popular issue.
Firstly, on the basis of known the constitution of the urban rail and the protection for DC traction power supply system, the dissertation study the subway power supply mode, protected principle and realized form. Then, through the calculation of short-circuit parameter and analyze the characteristic of the short-circuit currents on the work and traction load, the dissertation using power system model in MATLAB/SIMULINK,it not only built the 12-pulse rectifiers and DC traction power supply system, but also simulated and analyzed the short-circuit currents when a contact line short-circuit occurred at different positions. The dissertation study mon protection methods, and design the allocation means for these protection, devise the protection process when the fault happened. Last, the thesis design a simple modularized protection system of feeder line in subway, and simply analyzed each module, made it pletely.
The dissertation calculate some parameter, such as railway DC resistance, inductance and external inductance of supply circuit. It study the calculation method of short-circuit on single side feeding and two