摘 要随着近年来能源危机不断加重，节能减排的政策落实以及新能源的不断发展，使得风力发电等新能源发电技术不断成熟。随着世界各国的风电容量不断发展与扩大，风电场对电力系统的稳定性也日趋严峻。因为电力系统发生故障时，继电保护动作需要一定的响应时间，所以风电机组在这短时间要进行穿越保持不脱网运行对电力系统的稳定就显的十分重要。本论文以直驱型风力发电系统作为研究对象，基于 MATLAB 仿真软件进行仿真研究。首先本文介绍了风力发电近几年来国内外的发展现状和发展趋势。建立了直驱型风力发电系统的数学模型，并分析了包括风力机、永磁同步发电机的一些基本概念及数学模型，为接下来的仿真研究打下了基础。接着本文围绕着卸荷电路阐述了有关电网电压跌落的相关知识，并建立了卸荷电路的基本数学模型，随后确定了用卸荷电阻通过 BUCK 电路和直流侧并联的拓扑结构来实现直驱型风电系统的低电压穿越。最后在 MATLAB 仿真软件上进行仿真研究，得出结论，实现了直驱型风力发电系统的低电压穿越。关键词:直驱型风力发电系统；低电压穿越；卸荷电路；BUCK 电路。 Abstract With the increase in recent years the energy crisis, energy conservation and emissions reduction policy implementation and development of new energy, make wind power and other new energy power generation technology matures. As the capacity of wind power in the world continues to grow and expand, the stability of the electric power system is becoming more and more serious. Because the power system failure occurs, relay protection movement needs certain response time, so the wind turbines in the short time to be through to keep net running off is very important for the stability of power system is the significant. The paper is based on the simulation software of MATLAB simulation software. Firstly, this paper introduces the development status and development trend of wind power in recent years. A direct-drive wind power system is established, the mathematical model and analyzed including wind turbines, some basic concep...
