风电场集电线继电保护研究
本文讨论了双馈式异步风电机的短路电流特性，改进了风电场整定规则下短路电流周期分量计算方法运算曲线法，进行相间短路电流保护的整定计算。对风电场集电线路所在系统的中性点接地方式进行了分析和比较，选择适合风电场的中性点接线方式完成零序电流保护的整定计算。最后针对实际风电场进行集电线保护的配置与整定计算。
关键词 风电场 集电线路 短路电流 中性点接地 零序电流 继电保护
毕业论文设计说明书外文摘要
Title Study on wind power protective relay on the collector line
Abstract
In recent years, as more and more wind farms interconnected power system, the proportion of wind power in the power system is increasing, once a fault occurs, the grid will cause a greater impact.So running of wind power is becoming the focus of attention.Basic safe operation of the wind farm is setting up featured and Setting precise first run mode and secondary protection for wind farm.
This article discusses short-circuit current characteristics of doubly-fed induction generator,improve operation curve which is based on periodic component of short circuit current calculation method of wind farm tuning rules, finish setting calculation phase short-circuit current protection.Neutral grounding state of the wind farm collector lines was analyzed and compared.And select the appropriate neutral connection manner of wind farms accomplished setting calculation of zero sequence current protection.Finally, collector lines set up to protect and setting calculation for the actual wind farm.
Keywords wind power collector lines circuit current midpoint ground
zero-sequence current relay protection
目 次
1 引言 1
1.1 课题研究背景及意义 1
1.2 风电场集电线路继电保护研究与发展现状 1
1.3 本文主要研究的内容 2
2 短路电流周期分量计算方法 4
2.1 电力系统等效电路 4
2.2 风电机支路短路电流周期分量 4
2.3 系统支路短路电流周期分量 6
2.4 短路点短路电流周期分量的幅值 6
2.5 本章小结 6
3 风电场相间短路电流特性 8
3.1 概述 8
3.2 相间短路电流特性研究 8
3.3 方向元件 9
3.4 相间短路电流保护整定计算 10
3.5 本章小结 12
4 风电场接地方式分析和比较 13
4.1 概述 13
4.2 中性点接地方式分析 13
4.3 零序电流计算 18
4.4 本章小结 19
5 实际风电场的集电线整定计算 20
5.1 风电场系统参数 20
5.2 实际风电场1线继电保护整定 21
5.3 实际风电场4线继电保护整定 24
5.4 本章小结 27
结论 28