双馈式变速变桨风力发电机组的转矩控制

Torque Control of Doubly-fed Variable Speed Variable Pitch Wind Turbine

对于现代大型变速变桨(variable speed variable pitch,VSVP)风力发电机组,人们越来越多地关注于如何提高机组的发电量,降低机组关键部位的载荷。提出在低风速时采用传统PID的独特解耦控制改变发电机转矩,实现风电机组变速运行,最大程度地实现最佳风能利用系数曲线的追踪控制;在高风速时采用"转矩纹波"技术加大传动链阻尼,避免传动链的振动。通过Bladed软件对2种转矩控制方式进行仿真分析,结果表明:相对传统的转矩控制方式,提出的转矩控制方式能在一定程度上提高风电机组的发电量,并能有效地降低机组关键部位的疲劳载荷。

For modern VSVP （variable speed variable pitch,VSVP） wind turbine, more and more attention is focused on how to improve energy capture and reduce extreme or cyclic loads on crucial parts of the turbine. A special decoupling control scheme was proposed to modify the generator torque to achieve the variable speed control, so that the turbine can track the optimal power coefficient （Cp） curve furthest. The ＂ripple torque＂ technique was adopted to increase the drive train damper to avoid gearbox vibration. From the Bladed simulation results on the two torque control schemes, the way of torque control presented here in doubly-fed VSVP wind turbine can improve the energy capture, increase yield energy, and can also reduce the loads of some crucial parts of the turbine.