大型双馈异步风力发电机组变桨控制算法研究

变桨控制系统[1]是变速恒频风力发电机组的重要组成本分,它不仅关系到大型MW级风机的安全运行,而且对风能的吸收具有较好的控制作用。其中变桨控制算法是其控制系统的核心部分,为减小整机机械载荷、风机功率的稳定输出做出重要贡献。基于2.0 MW双馈风力发电系统的基础上,提出了具有转速二阶陷波滤波器的增益调度-双PI(notch filter gain-schedule double PI)控制算法,对风机运行于额定风速以上的变桨控制策略[2],使风机能够以最佳的速率变桨到最佳桨距角位置,从而输出稳定的功率,减小整机的振动,减小风机在3P、6P处产生过大的振动。最后对2.0 MW双馈异步风机变桨控制进行仿真和实际监控图分析,结果表明,其控制算法具有良好控制效果。

Research on Pitch Control Algorithm of Large Double-fed Induction Wind Turbine Generators

Pitch control system is an important part of the variable speed constant frequency （VSCF） wind power generators. It is not only related to the safe operation of large MW grade wind generators, and also to the better control effect on the absorption of wind power. The pitch control algorithm is the core part of the control system, which makes an important contribution to the reduction of the mechanical load and the stability of the power output. Based on 2.0 MW double - fed wind power systems, gain scheduling - double PI （ notch filter gain - schedule double PI） control algorithm with second - order notch filter is proposed, which makes wind generators in the best rate to reach the best position for the pitch control strategy in which the wind generator is operating above the rated wind velocity. This algorithm is able to output the stable power and reduce the vibration of the whole machine. Finally, the simulation and practical monitoring diagram analyses for the pitch control of 2.0 MW double -fed induction generators are carried out. The results show that the proposed control algorithm has good control effect.