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大型变桨距风电机组在额定风速以上通常采用PID控制器调节机组桨距角,以达到功率恒定的目的。但由于风轮气动特性的非线性,单一PID控制器往往难以达到满意的控制结果。在深入分析风轮气动特性的基础上,采用数值计算和多项式曲线拟合的方法建立额定风速以上桨距角和风速的非线性模型。并根据风速采用优选法对该模型进行了分段线性化。针对每一线性化后的风速分区设计各自合适PID控制器。在风速变化时,根据调度策略对多个PID控制器进行切换。多PID切换的变桨距控制方法充分考虑了风机的动态特性,算法简单,便于实现。对300kW风电机组的仿真表明,新方法具有较好的控制效果。
Large pitch wind turbines above the rated wind speed is usually used PID controller to adjust the unit pitch angle, in order to achieve the purpose of constant power. However, due to the non-linear aerodynamic characteristics of the wind turbine, a single PID controller is often difficult to achieve satisfactory control results. Based on the in-depth analysis of the aerodynamic characteristics of the wind turbine, a nonlinear model of the pitch angle and the wind speed above the rated wind speed is established by means of numerical calculation and polynomial curve fitting. According to the wind speed, the model is segmented and linearized. Design each suitable PID controller for each linearized wind speed partition. When the wind speed changes, multiple PID controllers are switched according to the scheduling strategy. Pitch control method of multi-PID switch fully takes into account the dynamic characteristics of the fan, the algorithm is simple and easy to implement. The simulation of 300kW wind turbine shows that the new method has good control effect.