摘要近年来，随着环境污染、能源危机的问题在全球范围内愈演愈烈，各国都在努力开发利用新能源，借此来调整能源结构，达到可持续发展的目的。风电作为绿色能源，以其资源丰富，价格便宜，干净无污染的优点，在我国的新能源发电领域发展快速。随着风力发电在我国的大力推广，风电并网后对风电场送出线路继电保护的影响不可忽视。本文进行了双馈风电机组建模和仿真，并根据双馈风电机组的MATLAB仿真模型，深入探究了并网风电场的时域仿真模型及其送出线路的故障电压、电流的特点。然后，本文分析了不同原理的距离保护实现方式，结合并网线路的故障特征，研究了大容量风电场并网的距离保护的适应性问题，并做了仿真验证。最后，针对大容量风电场并网对并网线路的距离保护的影响，给出了相应的改进方法。83129

毕业论文关键词  双馈异步风电机组  故障短路电流  距离保护  适应性

毕业设计说明书（论文）外文摘要

Title  Adaptability  Research  of  Distance  Protection  on Transmission  Line  Merged into  The  Power  Gird  of                Large-scale Wind Farm   Abstract In recent years, the problem of environmental pollution, energy crisis intensified across the globe, every country is trying to harness new energy sources, thereby to optimize the energy structure, to achieve the goal of sustainable development。 As a renewable energy, wind power has merit of abundant resources, cheap, clean and pollution-free。 Thanks to its merit, wind power develops rapidly in the field of new energy power generation in our country。 With the vigorous promotion of wind power, wind power integration has great influence on transmission line relay protection。 In this paper, modeling and simulation of doubly-fed wind turbine were studied, and based on the MATLAB simulation model of wind turbine, grid connected wind farm in the time domain simulation model and the fault characteristics of voltage and current of the transmission line were studied。 Then, the implementation of different distance protection was analyzed。 Next, combining with the fault characteristics of connect-in transmission line, the adaptability problem of distance protection in large-scale wind farm which connects to grid was studied and simulation verification was done。 In the end, in order to eliminate the impact of large-scale wind farm on the distance protection of connect-in transmission line, the corresponding improvement means were put forward。

Keywords  doubly-fed induction wind turbines  faulty short-circuit    current  distance protection  adaptability

目  次

1 绪论 1

1。1 选题的背景与意义 1

1。2 大容量风电并网对距离保护的影响研究现状 1

1。3 本文的主要工作 2

2 双馈风力发电机组的建模与仿真 4

2。1 双馈风力发电机组的基本原理 4

2。2 双馈风力发电机的功率关系 5

2。3 双馈风力发电机组的数学模型 6

2。4 双馈风力发电系统的仿真实现 9

2。5 本章小结 13

3 双馈风电场的故障特征分析 15

3。1 双馈风电场的结构及仿真模型 15