In addition, the height, density and perpendicularity of remnant stubble, straws and grass had influence on aerodynamic roughness and wind velocity fluctuation on different underlying surfaces.

此外，作物残茬、秸秆和牧草等粗糙元的高度、密度及直立性均对下垫面的空气动力学粗糙度、摩阻速度及风速脉动有一定影响。

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There are many influencing factors of wind power unit such as wind velocity, confused flowing, tower-shadow effect and so on, which will bring fluctuation of wind turbine output.

风电机组发电出力的影响因素有很多，如风速、紊流、风机塔影效应等，这些因素的随机变化都会引起风机出力的波动。

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