基于改进最小方差法的风电机组变桨距控制

针对额定风速以上风电机组变桨距控制问题，提出了一种基于改进最小方差法的风电机组变桨距控制策略。该方法将延长预测步长思想，时变砺设计和柔化控制作用相结合，能够在突变过程初期，限制控制幅度，在控制后期能够加快收敛速度。同时与递推最小二乘辨识方法结合，用于额定风速以上风电机组变桨距控制系统。通过算例仿真表明，与传统的最小方差控制和PI控制方法相比，该方法能够使得系统响应迅速，在额定风速以上快速改变桨距角，保证了风电机组恒功率输出运行。

Modified Minimum Variance Method for Variable Pitch Control of Wind Power Generation

In view of the pitch control of wind power units above the rated wind speed, this paper introduces an improved minimum variance pitch control method. This method combines concept of prolonging predictive step length and time varying design with softening control function so that the control amplitude can be limited in the preliminary stage of mutation process and convergence can be sped up in the later stage. In addition, the recursive least squares identification is incorporated in the design of the pitch control pitch control system for wind power units above the rated wind speed. The simulation results show that compared with the traditional minimum variance control and PI control, this method leads to a fast system response, fast changing pitch angle and constant power output.