风力发电机组的自适应转矩控制及载荷优化

Adaptive Torque Control and Load Optimization of Wind Turbines

针对变速变桨风力发电机组(variable speed variablepitch,VSVP)如何在低风速时最大限度捕获风能以及在额定风速以上降低传动链载荷进行研究。低风速时在研究了传统风能追踪控制策略的基础上,文中提出通过改变最优增益系数来追踪最佳风能利用系数的自适应转矩控制策略。同时针对风力发电机组传动链的扭转振动,提出了基于发电机转速反馈滤波的转矩纹波控制方式。以2MW变速变桨风力发电机组为验证对象,基于Blade软件平台对所采用的控制策略进行仿真研究。结果表明:所提出的自适应转矩控制策略能够更好的追踪最大功率点,同时采用转矩纹波能够降低传动链载荷。

This study presents a study on how the VSVP （variable speed variable pitch） wind turbine captures the maximum wind energy at a low wind speed and how it reduces the drivetrain load at the rated wind speed. Based on the study on the conventional energy capture at a low speed, this paper proposes the adaptive torque control strategy by which the optimal power coefficient can be tracked by changing the optimal mode gain. Meanwhile, aiming at reducing the gearbox vibration of the wind turbine ,the paper proposes the torque ripple control based on measuring the generator speed. With a 2 MW variable-speed adjustable-pitch wind turbine as an object for study,the control strategy is simulated with the Bladed software. Simulation results show that the proposed control strategy can better track the maximum power point in low wind speed areas and the proposed ripple torque control decrease the drivetrain load.