摘 要现如今，风力发电的发展趋势是设计和制造大型风力发电机组、优化风力发电机组的载荷和提高风能捕获效率等等。研究风力发电的转矩控制技术不但能够使风力机从自然界捕获更多的风能，而且可以使输出功率维持在额定功率。本论文采用了双馈式风力发电机来分析如何捕获最大风能,变速恒频的风力发电机组的一个重要特性就是随着风速的不断变化发电机转子的转速也会改变，所以为了捕获更多的风能，提高风力发电的输出功率，必须根据电机本身的特点来制定相应的控制方案，使风轮按照最佳叶尖速比运行，得到更高的转换效率，因此研究转矩控制系统很有意义。86477

本文基于PLC对转矩进行控制，将传感器测量到的数据送入PLC，经过数据转换后，由PID模块进行计算，最后输出变桨信号。不断循环这一流程来完成对风机转矩的控制。并且利用PLC仿真软件进行仿真，验证了该控制方案能够严格控制转矩，使风机正常运行，还提高了风机的发电效率和使用寿命。

毕业论文关键词：最大风能捕获控制；转矩控制；PLC仿真

ABSTRACT Today, the trend of wind power is the design and manufacture of large wind turbines, optimizing the load of wind turbine and the increase of wind energy capture efficiency。Discussing torque control technology of wind power generation not only enables the wind turbine to capture more wind energy from nature, but also maintains the output power at rated power。 In this paper, a dual-fed wind generator is used to analyze how to capture the wind energy to the greatest extent。An important characteristic of VSCF wind turbine is constantly changing speed of the generator rotor according to the wind speed, so in order to capture more wind energy and increase the output power of wind turbines, we must design appropriate control scheme based on the characteristics of the motor itself,making the motor working on optimal tip speed ratio to obtain the highest conversion efficiency。In a word,discussing torque control system is of great significance。 

Torque control is based on PLC。Firstly,the data of sensors are sent to PLC。After the conversion ,these data will be calculated by the PID module。Finally,the system outputs the pitch signal。This process is cycled to complete the control of torque。Using software to simulate the control system shows that the control scheme can not only strictly controls the torque, making sure the correct operation of the fan, but also improves the power generation efficiency and service life of the fan。

Key word:Capture the wind energy to the greatest extent；Torque control；PLC simulation

目录

第一章 绪论 1

1。1风力发电的目的及意义 1

1。2国外发展状况 2

1。3国内发展状况 2

1。4风力发电的趋势 3

1。5双馈式风力发电系统 4

   1。5。1双馈电机 4

   1。5。2变速恒频原理 5

   1。5。3双馈式风力发电系统 6

1。6本文研究的内容及结构安排 7

第二章 最大风能捕获技术 8

2。1风力机空气动力学 8

2。2 风能利用系数 9

2。3变桨距调节原理 11

2。4最大风能捕获技术