摘要风能作为一种清洁的可再生能源已经得到越来越广泛的应用。风力发电是大规模利用风能的最经济方式，在世界各国得到了广泛重视。但由于风电具有很强的随机性，风力发电的并网会给电力系统带来频率、电压的稳定性带来影响，并可能给电网带来一系列电能质量问题，如电压波动及闪变、谐波污染等。对于未来大规模风电并网的实现，风电并网对电能质量的研究越来越显得迫在眉睫。 本文首先介绍了风力发电系统的数学模型，包括风速模型、风力机模型和异步发电机模型。
其次利用MATLAB中的风力模型，搭建基本风电并网模型，仿真分析了风电场在并网过程中启动、风速扰动、负荷扰动、系统接入点处短路、风电机切机等情况下系统个关键点的电压波动。
最后根据仿真分析得到的结果，分析风力发电并网过程中电压波动存在的问题。9913
关键词 风力发电 双馈感应发电机 电压波动 MATLAB/Simulink 并网
毕业设计说明书（论文）外文摘要
Title The Study of Power Quality in Wind Farm
Abstract
Wind energy as a clean, renewable energy has been more and more widely used. Wind power is the most economical way to the large-scale use of wind energy and has been extensive attention. However, due to it's strong randomness, the integration of wind power will have an impact on the frequency of power system and voltage stability and may bring a series of power quality problems to the grid, such as voltage fluctuations and flicker , harmonic pollution. For the realization of the future integration of large-scale wind power, the study of power quality for the integration of wind power has becoming more urgent.
First，this paper introduces the mathematical model of the wind power generation systems including the wind model, the wind turbine model and the asynchronous generator model.
Next,we build the wind power model using the wind model in MATLAB, and simulate and analyze the voltage fluctuations of the critical points in power system,on the condition of the integration of wind power ,including the start of wind turbine, wind speed disturbance, load disturbance, the short circuit of link point, wind power and the cutting of wind turbine ,
Finally, according to the results obtained by the simulation analysis, we analyze of the problems of voltage fluctuations in the process of wind power integration.
Keywords Wind Power DIFG Voltage fluctuations MATLAB/Simulink Integration
目 次
1 绪论 1
1.1风力发电背景 1
1.2风电场运行对电能质量的影响 2
1.3本文研究背景和意义 3
1.4本论文研究的主要内容 4
2 风力发电系统的数学模型 5
2.1风速模型 5
2.2风力机模型 7
2.3异步发电机模型 11
3 并网仿真模型的建立 14
3.1仿真软件介绍 14
3.2 MATLAB中的风机模块 14
3.3风电场接入系统的方式 15
3.4风电场的电压等级 17
3.5风电场并网运行引起的闪变机理 17
3.6风电场并网仿真模块建立 18 MATLAB风电场的电能质量问题研究:http://www.youerw.com/zidonghua/lunwen_8799.html