兆瓦级同步风力发电机变桨距控制策略研究

Study on the Pitch Control Strategy of Megawatt Synchronous Generator

变桨距风力发电机已成为风力发电机组的主要研究和发展方向,结合长星集团同步风力发电机组,对变桨距控制技术进行了研究,在额定风速以下时实行变速运行,控制发电机的励磁电流从而控制发电机的转速,使得风力机转速能够跟随风速变化,保持最佳叶尖速比使系统获得最大的风能利用系数;额定风速以上时,采用PID控制算法控制桨距角,使发电机输出功率恒定,并提出了实现方法;通过仿真工具进行计算机仿真,验证了本方法的有效性。

Variable pitch control has become the major research and development about wind turbine. This paper studies on the technology of pitch--control for synchronous generator of Changxing company. The wind turbine takes variable speed stategy under the wind speed rating. To Control the excitation of the generator in order to control the speed of the generator. The speed of wind turbine should go with the change of wind speed. So the optimal tip velocity ratio can be obtained that makes the wind turbine with higher rotor power coefficient. In order to get constant output, PID control algorithm is used to control pitch angle. All those strategies are carried out through simulation, the results show the effectivehess.