交直流互联电网故障对交流保护的影响

论文总字数：21976字

摘 要

随着西电东输和全国联网的全面实施，交直流互联输电已成为我国电网广泛采用的一种输电技术。交直流互联系统的出现，对电力系统故障暂态过程和继电保护带来了新的问题。交直流相互作用下，原有的交流系统继电保护在直流系统故障以及交直流互相作用下的动作特性将有所改变，交直流互相作用的暂态过程也更为复杂。本课题在研究传统电网继电保护研究基础上，从相互作用途径，交直流互联受端电网故障特征变异，分析研究交流继电保护中的零序、负序分量元件、突变量方向保护等的影响；提出方案，保证交直流混联电网的安全稳定运行。

关键词：交直流互联电网；配电网；零序、负序分量元件；动作特性。

Design of Relay Protection and Regional Protection for 10kV Distribution System

Abstract

With the implementation of the west-east power transmission and the nationwide network, AC/DC interconnection transmission has become a widely used transmission technology in China's power grid. The emergence of AC/DC interconnection system brings new problems to the fault transient process and relay protection of power system. Under AC-DC interaction, the action characteristics of the relay protection of the original AC system will be changed under the fault of the DC system and AC-DC interaction, and the transient process of AC-DC interaction will be more complex. Based on the study of traditional power grid relay protection, this paper analyzes the influence of zero sequence, negative sequence component and mutation direction protection in AC relay protection from the interaction way and the variation of terminal power grid fault characteristics of AC and DC interconnection. The scheme is put forward to ensure the safe and stable operation of AC-DC hybrid power network.

Keywords：AC/DC interconnected power grid; Distribution network; Zero-sequence and negative-sequence components; Action features

目 录

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

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

第一章 绪论..........................................................................................................................................................4

1.1课题背景..................................................................................................................................................4

1.2 课题研究意义.........................................................................................................................................4

1.3 国内外研究综述.....................................................................................................................................4

1.4 本文做的研究重点.................................................................................................................................5

第二章 交直流互联电网故障特征变异机理......................................................................................................6

2.1 概念.........................................................................................................................................................6

2.2 基于竞争的故障特征变异机理分析.....................................................................................................7

2.3 扰动下的直流系统动态分析.................................................................................................................8

第三章 交直流互联电网相互影响途径..............................................................................................................9

3.1 交直流互联电网相互影响的途径.........................................................................................................9

3.2 交直流互联电网遇到的问题...............................................................................................................10

第四章 交直流互联电网对交流继电保护的影响............................................................................................12

4.1 加入直流系统后对原系统工作点变化的影响.....................................................................................12

4.2 故障后电量特性的变异给交流继电保护带来挑战.............................................................................13

4.3 对变化量方向性元件、零序和负序元件的影响..................................................................................15

4.3.1 对变化量方向性元件的影响........................................................................................................16

4.3.2 对零序元件的影响........................................................................................................................17

4.3.3 对负序元件的影响........................................................................................................................18

第五章 结论........................................................................................................................................................19

谢辞.....................................................................................................................................................................20

参考文献..............................................................................................................................................................21

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