摘要变速风力发电机的运行需要合理的控制策略，从而更大限度地捕获风能。其中，风力机的最大功率点跟踪（Maximum power point tracking, MPPT）控制旨在控制风轮转速跟踪由实时风速所决定的最佳转速，进而捕获更多风能。风力机MPPT控制具有多种实现方法，其中包括在工程实际中被广泛应用的间接转速控制以及在理论研究中较为常见的直接转速控制。82939

间接转速控制原理简单且无需测量实时风速信息，而直接转速控制为了提高风能捕获效率，需要获取实时风速信息且原理比较复杂。本文首先详细阐述了三种间接转速控制方法和三种直接转速控制方法的原理，并在MATLAB/Simulink环境下分别进行仿真实现和简单的分析。最后，使用风力机专业仿真软件FAST，对这两类方法在转速跟踪效果、发电效率和结构载荷三方面进行了详细的对比及分析。发现直接转速控制在转速跟踪和发电效率方面的表现要优于间接转速控制，而间接转速控制则在结构载荷方面的表现要优于直接转速控制。

毕业论文关键词  变速风力发电机；MPPT控制；直接转速控制；间接转速控制；FAST；  MATLAB/Simulink

毕业设计说明书外文摘要

Title    Implementation and conparison of indirect speed control        and direct speed control of wind turbine                                                 

Abstract Variable speed wind turbine operation requires reasonable control strategy to get maximum wind power extraction。The maximum power point tracking control of the wind turbine is to control the speed of wind turbine to track the best speed determined by the real-time wind speed,and then to capture more wind energy。The MPPT control of the wind turbine has a variety of ways to achieve,including indirect speed control which is widely used in the engineering practice and direct speed control which is common in the theoretical research。

The principle of ISC is simple and does not require measuring the real-time wind speed。DSC need to obtain real-time wind speed and its principle is more complex in order to maximize the energy extracted from the wind。This paper describes three kinds of ISC methods and three kinds of DSC methods，and makes corresponding simulations and analyses respectively in the MATLAB/Simulink environment。Finally，this paper makes detailed comparisons and analyses between ISC and DSC in three aspects which is effection of speed tracking,power generation efficiency and structural loads by using the FAST,a professional simulation software for wind turbine。Theoretical analyses and simulation results shows that,the performance of DSC in the speed tracking and power generation efficiency is better than the ISC,but ISC is superior to DSC in the performance of the structural load。

Keywords  Variable speed wind turbine；MPPT control；Direct speed control；

          Indirect speed control；FAST；MATLAB/Simulink

目   次

1 引言 1

1。1 课题研究的背景及意义 1

1。2 课题研究现状 1

1。3 本文具体研究内容及章节安排 3

2 风力发电机的数学模型 4

2。1 风力机的气动模型