摘要现如今随着世界人口的增多，人类对资源的消耗也变得越来越大，人们逐渐感受到资源枯竭所带来的压力。发展可再生能源已经刻不容缓，风力发电现在已经逐渐成为世界各国研究的热点。随着大力推广风力发电，风力发电技术得到迅速的发展，风力发电机的装机容量与日俱增，风力发电在整个电力系统所占的比重也越来越大。越来越多的风电机组并入电网，电网与风电机组互相之间的影响也越来越明显，电网运行规则也随之提高，新的电网运行规则就要求在电网故障发生的时候，风力发电机能够不间断运行。86056

本文对电网故障和风力机组故障诊断方法进行了描述。通过利用Crowbar保护控制，可以使风力发电机在电网故障下依然能够不间断运行。本文仿真研究了在电网故障下带有Crowbar保护控制的交流励磁风力发电机的运行行为，分析了不同旁路电阻阻值对保护效果产生的影响。仿真结果验证了当电网故障发生时，Crowbar保护电路可以很好的对发电机起到保护作用。

毕业论文关键词：风力发电；电网故障；电网电压跌落；Crowbar电路

ABSTRACT Nowadays, with the increase of the world population, the consumption of human resources has become more and more big, people gradually feel the pressure of resource depletion。It is urgent to develop renewable energy, wind power has now become a hot research topic in the world。With the vigorous promotion of wind power generation, wind power technology has been rapidly developed, the installed capacity of wind turbines is increasing, the proportion of wind power generation in the entire power system is also growing。More and more wind turbines incorporated into the power grid, power grid with wind power generators are mutual influence is becoming more and more obvious, rules on operation of power grids are also increased, new rules of power grid operation requires when the power failure occurred, the wind generator to uninterrupted operation。

In this paper, the fault diagnosis method of power network fault and wind turbine generator is described。Through the use of Crowbar protection control, can make the wind turbine in the  still run under the fault of the power grid。In this paper, the simulation study under grid fault with crowbar protection and control of AC excited wind generator operation, analyzed the effects of different bypass resistance on protective effect。The simulation results show that the Crowbar protection circuit can protect the generator to protect the generator when the power grid fault occurs。

Key word: Wind power generation；Wind power failure；Power grid voltage sag；Crowbar circuit

目录

第一章 绪论 1

1。1 选题目的和意义 1

1。2 国内外发展现状 1

1。2。1 世界风电发展现状 1

1。2。2 国内风电发展现状 2

1。3研究设想及方法 3

第二章 海上风电故障 4

2。1电网故障类型 4

2。2电网故障诊断方法 4

2。2。1 专家系统 4

2。2。2人工神经网络 5

2。2。3 优化技术 5

2。2。4 模糊集理论 5

2。2。5多代理系统 6

2。2。6 贝叶斯网络 6