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摘要近几年，由于风力发电技术的快速发展以及我国对风电等新能源的政策的支持，中国的风电企业获得了很大的发展。然而，因为我国的风能资源的分布的特点以及配电网的发展现状，中国的风力发电发展呈现出大规模集中的开发的特点，并且大型风电场很多部分是在边远地方且远离负荷，所以发电要通过较长线路和超高压来输送给负荷所在地方。由于风力发电本身的波动性以及不确定性，超高压送电具有很大的充电功率，这样会让大规模风电集中接入地区电网电压风电出力变化加大，更严重时会影响了电网电压运行质量以及稳定性。所以对于大规模风电并网集中的无功电压特性的探寻对我国风电技术的发展具有及其深刻现实意义。39709
- 上一篇：单片机三相异步电动机的保护与控制+硬件图
- 下一篇：同步发电机励磁控制系统设计+MATLAB仿真
本文先总结了风电在国内以及国外的研究现状，接着介绍了风电的主要工作方式。通过对风电机组不同的类型的研究，介绍了当前目前运用最多，优势最为突出的双馈式感应风力机组。然后我们又根据其原理建立了双馈式感应风力发电机组所对应的数学模型。通过建立风力机组的模型，在MATLAB中仿真软件的帮助下实现了多台风力发电机组接入电力系统的不同情况的模拟，分析了风电场在接入电网运行时风电场和电网之间有什么相互的影响，主要研究无功功率的波动，电压波动的特点，输出功率和电压质量的变化状况。
毕业论文关键词： 大规模 双馈异步风力发电机 MATLAB 无功特性
Abstract
In recent years, due to the rapid development of wind power technology and our country’s policy support for new energy resources such as wind power, China's wind power enterprises have rapidly developed.However, because of the distribution characteristics of China's wind energy resource and current situation of the development of power distribution network, China's wind power development shows the characteristics of large-scale centralized development . Meanwhile, many parts of large-scale wind power plants are located in remote areas, being far away from the load.Therefore, in order to generate electricity, the power needs to be transmitted through a long line and ultrahigh pressure (UHP) to the place where the load is.Due to the volatility and uncertainty of wind power itself, ultra-high voltage power transmission has very large charging power, which will make the voltage of the regions having access to the large-scale wind power tend to increase.Worse still, it can affect the operation quality and stability of voltage.As a result, the exploration of reactive power and voltage characteristics of large-scale wind power concentrated grid has a profound influence on the development of wind power technology in China.
This paper first summarizes the current research situation of wind power in the domestic and foreign countries.Then，it introduces the main working mode of wind power.Through the research of the types of wind turbine,this paper mainly introduces doubly fed induction wind generator that is not only the most widely-used but also of the biggest advantage. We then establish the model of doubly fed induction generator wind turbine. After the establishment of the wind turbine model, we have realized simulations in different situations when a plurality of wind power generation are connected to power system at the same time with the help of MATLAB simulation software.This paper also analyzes how wind power plant and power grid will influence each other when wind power plant is connected to the operation system of power grid. Reactive power compensation device will be added at the net and the exit in order to study the fluctuations in the power, characteristics of voltage fluctuation, and the changes of output power and voltage quality.
Key word：Large-scale, MATLAB, double-fed induction wind turbine, reactive power
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