电力系统中性点接地方式的研究

论文总字数：21142字

摘 要

电力系统的发展与人类社会和经济社会的发展有着不可分割的密切关系，电能的质量以及电力系统的供电可靠性成为了人类生产生活能否能够正常进行、经济社会能否稳定向前发展的重要影响因素之一，而合理的选择中性点接地方式则是电力系统能够稳定安全持续运行的基础。

本文主要针对电力系统中性点的接地方式进行深入研究，在全面剖析了电力系统发展至今被广泛采用的中性点不接地方式、中性点经消弧线圈接地方式、中性点经电阻接地方式以及中性点直接接地方式这四种接地方式的优缺点及运行特性的基础上，运用MATLAB的Simulink Library Browser中的SimPowerSystems工具箱建立不同接地系统下发生单相接地故障的仿真模型，进行单相接地故障仿真分析。本文还大概介绍了中性点经自动跟踪补偿消弧线圈接地、经新型小电阻接地以及经消弧线圈并电阻接地等新型接地方式。

关键词：中性点 ；接地方式；MATLAB；仿真

Abstract

The development of power system has an inseparable relationship with the development of human society and economic society. The quality of electrical energy and the power supply reliability of the power system have become one of the most important factors of whether human life can be carried out normally and the economic society can develop steadily. A reasonable choice of neutral grounding mode is the basis for stable, safe and continuous operation of the power system.

This paper mainly studies the grounding mode of the neutral point of the power system, and analyzes the advantages and disadvantages of the four kinds of grounding methods, namely, neutral point ungrounded mode, neutral point through arc suppression coil grounding mode, neutral point through resistance grounding mode and neutral point directly connected to local type of power system. On the basis of the operation characteristics, the simulation model of single phase grounding fault of different grounding systems is established by using the SimPowerSystems toolbox of Simulink Library Browser of MATLAB, and the simulation and analysis of single-phase grounding fault are carried out. This paper also introduces some new grounding methods, such as the automatic tracking and compensating the grounding of the arc suppression coil, the new small resistance grounding, the arc suppression coil and the resistance grounding.

Key words: neutral point; grounding mode; MATLAB; simulation

目录

摘 要................................................................................Ⅰ

Abstract................................................................................Ⅱ

第一章 绪论.............................................................................1

1.1 引言............................................................................1

1.2 我国中性点接地的发展及现状......................................................1

1.3 课题的意义及前景................................................................2

1.4 论文的主要工作..................................................................2

第二章 不同中性点接地系统的基本运行特性及应用...........................................3

2.1 中性点接地方式的分类............................................................3

2.2 各种接地方式的优缺点及应用......................................................3

2.2.1 中性点不接地方式...........................................................3

2.2.2 中性点经消弧线圈接地方式...................................................4

2.2.3 中性点经电阻接地方式.......................................................5

2.2.4 中性点直接接地方式.........................................................6

2.3 不同中性点接地方式的比较........................................................7

2.4 中性点接地方式在各个领域的应用..................................................8

2.4.1 海工及船舶中压电力系统中性点接地方式.......................................8

2.4.2 铁路电力系统中性点接地方式.................................................9

2.5 新型中性点接地方式..............................................................9

2.5.1 中性点经自动跟踪补偿消弧线圈接地...........................................9

2.5.2 中性点经新型小电阻接地....................................................10

2.5.3 中性点经消弧线圈并电阻接地................................................11

1. MATLAB仿真模型的建立及分析.....................................................12

3.1 MATLAB及Simulink简介 .........................................................12

3.2 MATLAB仿真模型的建立...........................................................12

3.2.1 输电线路仿真模型的构建....................................................12

3.2.2 接地故障模型的建立........................................................13

3.2.3 测量模块..................................................................13

3.2.4 单相接地故障仿真模型......................................................13

3.3 单相接地故障仿真分析...........................................................14

3.3.1 中性点不接地系统单相接地故障仿真分析......................................14

3.3.2 中性点经消弧线圈接地系统单相接地故障仿真分析..............................16

3.3.3 中性点经电阻接地系统单相接地故障仿真分析..................................18

1. 总结与展望......................................................................20

4.1 总结...........................................................................20

4.2 展望...........................................................................20

致 谢...............................................................................21

参考文献...............................................................................22

第一章 绪 论

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