基于致动盘模型的风力机来流风速选取方法研究

Research on selection method of inflow wind speed of wind turbine based on actuator disk model

为了研究适用于致动盘模型的风力机来流风速选取方法,文章以取点、取面和反推3种典型选取方法为例进行计算。在不同入流风速和错列间距条件下,通过分析3种计算方式得到的来流风速发现:采用取点(或面)方法计算时,上游风力机的来流速度小于实际风速且不稳定,并随取点(或面)距离增加而增大;在功率爬升阶段,上、下游风力机的来流速度之差较大且稳定,当接近额定风速后,差值随风速增加而减小;与取点方法相比,取面方法所得风力机的来流速度变化范围更小;反推方法所得风力机的来流与实际来流较为一致,相对误差远小于取点(或面)方法,且不受取点(或面)距离影响,适用于致动盘模型计算,可在风资源评估阶段提升发电量预测的精准度。

In order to discuss the selection method of the inflow wind speed of the wind turbine suitable for the actuator disk model,three typical selection methods are used as examples for calculation.Under the different conditions of inflow wind speed and staggered spacing,the inflow wind speed calculated by three methods are analyzed.Found that when the point(or surface)-taking method is adopted for calculation,the inflow wind speed of the upstream wind turbine is less than the actual wind speed and is unstable,and increases with the distance from the taken point(or surface).In the power climbing stage,the difference between the upstream and downstream wind turbines’inflow wind speed is large and stable.When it approaches the rated wind speed,the difference decreases as the wind speed increases.Compared with the point-taking method,the wind turbine obtained by the surface-taking method has a smaller range of inflow wind speed.The inflow wind speed of the upstream wind turbine obtained by the inverse method is more consistent with the actual wind speed,the relative error is much smaller than the point(or surface)-taking method and is also not affected by the distance of the taken point(or surface),which is suitable for the calculation of the actuator disk method.The inverse method can improve the accuracy of power generation forecast in the wind resource assessment.