独立变桨控制对大功率风力发电机振动影响

摘要

With the increasing power of wind turbine, the structure is growing larger and larger, vibration problems have gradually emerged in domestic wind turbine. In view of this, based on the traditional method of pitch control, an individual pitch control strategy is proposed by combining the Linear Quadratic Regulator (LQR) with the Disturbance Accommodating Control (DAC). Then this control strategy is simulated under the environment of FAST and Matlab/Simulink software. The theory research and engineering application of a 5 MW wind turbines show the superiority of individual pitch control in vibration control of large scale wind turbine, which can effectively reduce the vibration of wind turbines, and then improve the equipment reliability, extend equipment′s service life, and reduce maintenance costs.%　　随着风力机功率的越来越大，结构越来越大，国产化风力发电机振动问题逐渐显现出来。以国产兆瓦级风力发电机组为依托，研究大型风力发电机组独立变桨距控制技术，并以此为基础研究独立变桨控制对大功率风力发电机振动影响。在研究了传统变桨距控制策略的基础上，提出基于线性二次型调节(LQR)和干扰自适应控制(DAC)技术的独立变桨控制策略。基于FAST和Matlab/Simulink软件平台对提出的控制策略与传统的变桨控制策略进行仿真比较。对一台5 MW 机组的仿真研究结果表明，分析结果与统一变桨比较，通过独立变桨，风力机结构的各项振动加速度幅值均有较大程度下降，能够有效降低风力发电机振动，进而可以提高设备可靠性和延长设备使用寿命，降低维护成本。