基于储能与桨距角协调控制的风电功率波动平抑方法

Wind power fluctuation suppression based on control coordination between energy storage and pitch angle

在风力发电系统中配置一定容量的储能系统,可以有效平抑风电功率波动。提出一种新的基于混合储能的风电功率平抑控制策略,采用滑动平均值算法获取风电输出期望功率,蓄电池和超级电容构成混合储能补偿系统。采用Mamdani型模糊控制器改变滤波器时间常数,实现可变滤波;考虑到滤波器的延迟效应,利用Takagi-Sugeno型模糊控制器调整蓄电池参考功率值,从而实现混合储能系统内部的协调控制,优化补偿功率分配。同时,提出基于储能系统荷电状态的风储协调控制机制,将风机桨距角的功率调节与储能功率平抑相结合,协同工作实现风电功率的良好平抑。仿真结果表明该协调控制策略具有良好的风电功率平抑效果。

An energy storage system with a certain capacity configured in the wind power system can efficiently suppress the power output fluctuation. A control strategy based on the hybrid energy storage system consisting of battery and super-capacitor is proposed to suppress the wind power fluctuation. The moving average algorithm is applied to obtain the expected wind power output,the Mamdani fuzzy controller is applied to change the time constant of low-pass filter for variable filtering and the Takagi-Sugeno fuzzy controller is applied to adjust the battery power reference for considering the delay effect of filter,which realizes the internal coordinative control of energy storage system and the optimal allocation of compensating power. The coordination between the pitch angle control for wind turbine power regulation and the SOC（State Of Charge） control for energy storage system is proposed to suppress the wind power fluctuation.Simulative results show the better performance of the proposed coordinative control.