摘要当今世界，电能已经成为人类社会不可替代的重要能源。传统的火力发电污染大，消耗大，而风力发电作为可再生能源发电，具备环保可再生、技术成熟等优势，受到了世界各国的高度重视。在众多种类发电机中，直驱风电系统具有低维护成本、低噪声、全速调节等优点。

双PWM变流器含有整流、卸荷和逆变三个部分。工作时先将三相电进行整流处理得到所需要的直流电，接着再进行逆变，把直流电逆变成和电网一样的交流电输入电网。卸荷单元的作用是避免发电机出现的电压泵升现象，提高系统稳定性。70401

本设计首先进行系统结构图的设计，然后围绕结构图进行硬件部分的设备选型与电路设计。硬件部分的设计首先注重了各元件可承受的最高耐压值以确保系统运行的稳定性，并采用PIC18F4331单片机作控制电路。其次是对其他部分的设计如驱动电路，检测电路等进行设计。最后进行了软件部分的设计。

本论文共有图23幅，表2个，参考文献41篇。

毕业论文关键词：风力发电  整流  逆变  卸荷  

Research on Double PWM Converter for Wind Power Generation

Abstract In today's world, electric energy has become an irreplaceable important energy in the human society. Traditional thermal power has large pollution and consumption, wind power as a renewable energy, is environmental and renewable, with technology maturity and other advantages, has been highly valued by countries around the world. In many types of generators, direct drive wind power system has the advantages of low maintenance cost, low noise, all speed regulation.

Dual PWM converter contains three parts, rectifier, unloading and inverter. When the work is carried out, the three-phase electric rectifier is used to obtain the required direct current, and then the inverter is carried out. The role of the unloading unit is to avoid the phenomenon of voltage rise in the generator and improve the stability of the system.

Firstly, the design of the system structure diagram is carried out, and then the equipment selection and circuit design of the hardware part of the structure is carried out. The hardware part of the design of the first focus on the various components can withstand the maximum pressure to ensure the stability of the system operation, and the use of PIC18F4331 SCM control circuit. Followed by other parts of the design, such as the drive circuit, detection circuit design. At last, the design of the software is carried out.

Key Words:wind power generation  rectifier  inverter  unloading

目  录

摘要 Ⅰ

Abstract Ⅱ

目录 Ⅲ

图清单 Ⅳ

表清单 Ⅴ

变量注释表 Ⅵ

1 绪论 1

1.1  课题选择的背景和意义 1

1.2  风力发电的现状和前景 1

1.3  直驱风电系统变流技术 3

1.4  课题研究的主要内容