变速风力发电机组的多变量桨距控制策略

摘要

For large doubly-fed VSVP (variable speed variable pitch, VSVP) winl turbine unit, this paper researches on the control strategy about how to maintain the stable output power and reduce rotor speed fluctuation above rated wind speed.Based on the traditional method of pitch control, a multivariable control strategy is proposed by combining a nonlinear torque control strategy with individual pitch control strategy for blade pitch angle.Then this control strategy is simulated on self-developed external controller based on the Bladed software.Simulation results of the proposed control strategy show that compared with the traditional method of pitch control, the proposed strategy of pitch control can maintain a stable power output under rated rotor speed, and reduce the peaking torque of gearbox.%针对大型双馈式变速变桨(variable speed variable pitch,VSVP)风力发电机组在额定风速以上如何保持输出电功率稳定和降低风轮转速波动的控制技术进行研究.在研究了传统变桨距控制策略的基础上,提出非线性转矩控制结合以独立变桨作为主体因素的多变量控制策略,并基于Bladed软件平台开发的外部控制器对该控制策略与传统的变桨控制策略进行仿真比较.结果表明:相对待统的变桨距控制,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,同时也能减小齿轮箱转矩尖峰.