摘要
随着城市的发展,以及城市人口的不断增长,城市轨道交通是缓解城市交通问题的最佳选择。城市轨道交通直流牵引供电系统作为城市轨道交通系统的重要组成部分,其安全可靠运行是整个城市轨道交通系统安全畅通运行的基础。直流牵引保护系统是保证直流牵引供电系统安全稳定运行的关键,研究适合于直流牵引供电系统的保护具有十分重要的意义。
对直流牵引供电系统进行建模分析是研究系统运行与故障机理的基础。本文从城市轨道交通直流牵引供电系统的结构出发,对直流牵引供电系统进行了建模,包括牵引变电站、第三轨及走行轨、地铁机车传动系统模型,并对直流牵引供电系统进行了仿真分析。
通过分析系统不同的运行状态下直流母线的电流分布情况,本文提出了适用于地铁直流母线的保护算法,针对CT断线这一情况提出了适合于地铁直流牵引系统的CT断线闭锁判据。对地铁直流大电流的测量装置进行了误差分析,研究了直流牵引供电系统谐波对地铁直流保护的影响,并设计了相应的模拟低通滤波器和数字滤波器。
基于Matlab/Simulink对本文设计的母线差动保护算法以及CT断线闭锁判据进行编程开发,利用仿真模型及现场录波数据对直流牵引供电系统不同运行状态下进行验证,证明了算法的有效性。
针对直流牵引供电系统的电流测量装置以及直流保护系统应满足的要求,本文对牵引供电系统微机保护装置的基本结构进行了设计,并对直流侧保护装置进行了配置,最后对该保护系统的数据通信方式进行了探索。
本文根据北京轨道交通系统的实际情况,对城市轨道交通直流牵引供电系统以及地铁车辆进行建模仿真,提出了牵引供电系统直流母线的保护算法,并对直流牵引保护系统的结构以及直流侧的保护配置进行了研究与设计,对保护系统的数据通信方式进行了探索,为直流母线差动保护的实现提供了理论依据和实验基础。
As an important part of urban railway system, security and reliability of the DC railway power supply system is the basis for the entire urban railway system. DC railway protection system is the key for the DC railway power supply system's security and reliability. Therefore, it is important to research and develop the DC railway protection system.
The DC railway power supply system is one of the most important parts of urban railway system, and it is the basis for analysing system operation and fault scenario to model the DC railway power supply system. By studying the characteristics and configuration of DC railway power supply system, this paper presents a model of the whole DC railway power supply system based on Matlab/Simulink, including traction substation rectifier system, rail system and locomotive electrical driving system. With the previous model, this paper analyses the operation condition of DC railway power supply system and the locomotive.
By analysing current distribution of the bus bar of different feeding arrangement, this paper proposed a new approach with the purpose of protecting the bus bar, then studied some interference factors such as measuring methods of the DC current, CT cable fault and harmonics of the system, and found the ways to reduce or eliminate these interference factors. At last, the bus bar protection algorithm was programmed based on Matlab/Simulink, and proved with simulation models and recording data of Beijing DC railway system.
Based on the development trend of the DC traction power system, this paper designed the basic structure of the microcomputer protection system, and then deployed the protection system configuration. This paper also researched the communication system of protection device.
The simulation models in this paper were modeled to coincide with the actual situation. the simulation results of different scenarios proved the effectiveness of the bus bar protection algorithm designed in this paper. This paper also researched the protection system configuration and the data communication mode. All of above provides theoretical and experimental basis for the practical applications of DC bus bar protection device.
引文
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