1MW风力发电机组的风轮功率特性

Power characters of 1 MW wind turbine rotor

以1 MW风力发电机组的风轮功率特性为例,采用动量叶素理论,推导出风力发电机组风轮输出功率的计算模型.对风速随高度变化和垂直切变的影响进行了分析,并利用泰勒级数对推导得出的风速模型进行化简,将其转换成关于叶片半径和方位角的表达式,从而对风速作用在叶片上的能量进行计算.结果表明,单只叶片的功率随叶片旋转方位角变化呈周期变化,且单只叶片功率变化的最大差值为150 kW;同时,3只叶片在风轮片面内均匀分布安装时,输出功率的脉动很小,与理论分析基本一致.

In order to research the power characters of the 1 MW wind turbine rotor, the calculation model for output power of the rotor was derived according to the momentum-blade element theory. The change of the wind speed with both height and vertical shear was analyzed. The wind speed model was simplified based on the Taylor series, and was converted into the equations of blade radius and azimuth. Thus, the wind energy operating on each blade was calculated. The results demonstrate that the output power of each blade exhibits the periodic change with the azimuth of blade, and the maximum value of the power variety for one blade is 150 kW. When three blades are distributed uniformly in the wind rotor, the fluctuation of output power is quite small, which is identical with the theoretical analysis.