一种考虑湍流强度的风力发电机出力评估方法

Wind driven generator output evaluation method considering turbulence intensity

Abstract

The invention discloses a wind driven generator output evaluation method considering turbulence intensity. The method includes the following steps that: model parameters and aerodynamic parameters of a wind driven generator to be evaluated are obtained, and then, the wind power hook surface of the wind driven generator relative to the variation of a wheel hub average wind velocity and a turbulence reference value can be determined according to the model parameters and aerodynamic parameters; a wind velocity sequence to perform wind driven generator output evaluation is segmented according to segmentation periods T, the turbulence reference value and the wheel hub average wind velocity of each segment of wind velocity sequence; and finally, the output of the wind driven generator at each segmentation period is determined according to the wind power hook surface, and the output of the wind driven generator in a total time segment is obtained, so that the total output of the wind driven generator can be obtained. The method of the invention is applicable to output evaluation of wind driven generators according to the models of the wind driven generators, so that planning of wind power plants, annual energy output prediction of the wind power plants, and the like can be performed. With the method adopted, evaluation errors caused by a situation in which only average wind velocity is considered can be avoided, and the accuracy of wind driven generator output evaluation can be greatly improved.
本发明公开了一种考虑湍流强度的风力发电机出力评估方法,首先获取所要评估的风力发电机的机型参数和气动参数,之后根据风力发电机机型参数和气动参数确定该风机关于轮毂处平均风速和湍流参考值变化的风功率曲面;接着将欲进行风机出力评估的风速序列按照分段周期T进行分段,确定每段风速序列的湍流参考值和轮毂处平均风速;最后通过风功率曲面确定该风机每个分段周期T的出力,合计全部时间段的风机出力得出风机总出力。本发明适用于按照机型分类对风力发电机进行出力评估,进而进行风电场的规划和风电场的年发电量预测等。该方法避免了只考虑平均风速影响带来的评估误差,较大程度的提高了风力发电机出力评估的准确度。

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