基于全风场功率输出的风力机控制策略研究

Research on the Control Strategies of the Wind Turbine Based on the Total Output Powers of the Global Wind Farm

为减小上游风力机尾迹影响,实现风场全局优化,基于致动线方法,利用OpenFOAM对风场上游风力机进行了9种不同偏航控制及15种不同风轮俯仰控制的数值模拟。比较各控制法下的风场总输出功率,并结合轮毂高度处水平截面及风轮中心垂直截面的流场云图,分析不同尾迹偏移控制方法对下游风力机影响的流动机理。结果表明:以不同控制方法改变尾迹流向,尽管上游风力机功率有所下降,但下游风力机输出功率显著提高,风场总输出功率得以大幅增加;两种尾迹偏移控制策略均可实现风场全局优化并都存在最佳偏移角,但偏航控制优于风轮俯仰控制;正俯仰角时风场总输出功率大于负俯仰角。

To decrease the wake effect of upstream wind turbines and realize the global optimization of the wind farm, simulations of nine yaw and fifteen tilt control methods with the upstream turbine were carded out based on an actuator line method with OpenFOAM. In all control methods, according to comparisons of total output powers of the wind farm, fluid field profiles at the wind turbine hub height and wind farm vertical sections through rotors center, the flow mechanism of the influence on downstream turbines with different control strategies of wake deviation was investigated. The results show that, changing the wake direction with different control methods, although the output power of the upstream wind turbine declines mildly, the total output powers of the wind farm increase significantly due to the output power rise of the downstream wind turbine. Both strategies of wake deviation can optimize the wind farm globally and each has an optimal angle, but with yaw prior to tilt and the plus tilt prior to the minus.