基于前馈的风力发电机组变桨距控制

Variable pitch control of wind turbine based on feed forward

针对变速变桨(Variable Speed Variable Pitch,VSVP)风力发电机组如何抑制反馈信号滞后引起的输出功率波动进行研究。在研究了传统PID反馈控制和基于测量风速前馈控制的基础上,提出了有效风速估计的前馈与传统PID反馈结合的变桨距控制策略,通过卡尔曼滤波与牛顿-拉夫逊算法进行有效风速估计,根据估计的有效风速给出合适的前馈桨距角,实现动态前馈补偿。以2 MW变速变桨风力发电机组为验证对象,基于Bladed软件平台对前馈控制策略与传统的变桨控制策略进行仿真比较。结果表明:相对传统的变桨距控制,提出的变桨距控制使风力发电机组能够在额定转速下保持稳定的电功率输出。

For large VSVP （variable speed variable pitch, VSVP）, this paper studies the control strategy about how to reduce the fluctuation of output power by inhibition of the feedback signal delay. Based on the study of traditional PID feedback control and feed forward control based on the measured wind speed, it proposes a variable pitch control strategy combining feed forward pitch based on estimated wind speed with traditional PID feedback, estimating effective wind speed through the Kalman filter and the Newton-Raphson algorithm, giving appropriate feed forward pitch angles according to the estimated effective wind speed and then achieving the dynamic feed forward compensation. With a research object of 2 MW wind turbine, simulation comparison between the proposed control strategy and the traditional method of pitch control are carried out on the Bladed software. Results show that the proposed strategy of pitch control can maintain a better power regulation.