大型风电机组自抗扰转速控制

大型风电机组通常具有较大的转动惯量,因此在风速变化时机组转速不能快速地跟踪最大功率点。为了提高风电机组在低风速下对风能的利用率,提出自抗扰转速控制策略。利用基于转速反馈的扩张状态观测器对系统的内外扰动进行观测,并采用扰动补偿的方法,将风电机组等效为一阶线性系统。基于自抗扰控制原理设计了系统的转速控制器。实时估计出机组捕获的机械功率并计算出转速给定值,采用转速控制器直接对转速进行控制。仿真结果表明,与采用传统的功率控制策略的机组相比,自抗扰转速控制策略在风速变化时对最大功率点的跟踪速度要快,机组对风能的捕获效率得到了提高,同时对风力机的参数依赖性小。

Speed control of large scale wind turbines based on active disturbance rejection control

A large-scale wind turbine typically has a greater moment of inertia which prevents the machine from changing speed fast enough to follow the maximum power point when wind speed changes.In order to improve the wind energy utilization of wind turbines in low winds,the speed control strategy based on active disturbance rejection control(ADRC) was proposed.Internal and external disturbance of the system was observed by the extended state observer(ESO) based on the feedback of rotor speed.The wind turbine was equivalent to a first-order linear system by compensating the disturbance.The speed controller of the system was designed based on the active disturbance rejection control theory.The speed setpoint was calculated on the basis of the mechanic power captured by the wind turbine which was estimated real-timely and the rotor speed was controlled directly by the speed controller.Simulation results show that compared to traditional power control strategy,the speed control strategy based on ADRC has distinct advantages of tacking the maximum power point more quickly and improving the wind energy utilization of wind turbines,when wind speed changes,and has less dependence on the parameters of wind turbine.