计及杆塔绕流效应的风速模型及其对风电机组输出功率的影响研究

Study on Wind Speed Model Considering Flow Around the Tower and Its Impact on Output Power of Wind Turbine

风电场中电力杆塔对风的遮挡可能造成下游风电机组输出功率的降低,为了分析杆塔遮挡对下游风电机组迎风风速的削弱作用,提出了一种基于亚临界雷诺值的杆塔绕流风速模型,该模型计及了尾流效应、山体地形、随机风向三个因素,研究了杆塔绕流对风电机组输出功率的影响;通过理论评估值与山西某风电场的实际监测数据的对比分析可知:在一些特定环境下,绕流效应对风电机组输出功率的影响不可忽视。因此,有必要评估杆塔绕流效应对风电机组输出功率的影响,为风电机组的微观选址提供理论指导。

A downstream wind turbine experiences a decrease in power output owing to the wind speed weakening caused by the shelter of tower.In order to calculate quantitatively the effect on WTG's output power caused by the shelter of tower,a wind speed variation model of tower was proposed.The presented model was used to study the effect of the flow around the tower on WTG's output power,which takes into account the wake effect,mountain terrain,and random wind direction.The output power of wind turbine was calculated by using simulation method with consideration of the flow around the tower and the results were compared with the actual monitoring data of a wind farm in Shanxi.Results show that the influence of flow around the tower on WTG cannot be ignored in some specific conditions.Therefore,in order to provide a theoretical guidance for micro site selection of wind turbine,it is necessary to evaluate the influence of the flow around the tower on power output model of WTG.