A simulation model of power grid with wind power generation units is built based on the equivalent wind speed model considering both wind shear effect and tower shadow effect for the simulative study of wind shear effect and tower shadow effect on 3p frequency voltage flicker in MATLAB/Simulink. Since there is error in low frequency bands of IEC flicker meter,a flicker meter based on Hilbert-Huang transform is given. Simulative results show that,the frequency of voltage flicker caused by tower shadow effect is three times higher than that of rotor speed,the magnitude of voltage flicker increases with the increase of the tower radius and decreases with the increase of the blade radius and the distance between tower and blades. The hub height and the wind shear effect have small influence on voltage flicker.%为研究风电机组风剪效应和塔影效应对电压闪变的影响,依据风剪效应和塔影效应的等效风速模型,建立了含风电电网的仿真模型,在MATLAB/Simulink中仿真分析了风剪效应和塔影效应引起的3p频率的电压闪变.由于IEC闪变测试系统在低频段存在误差,提出了基于Hilbert-Huang变换的闪变检测.通过仿真得到结论:风电机组塔影效应引起的电压波动和闪变的频率为风轮转速的3倍,闪变值随桨叶半径和桨叶旋转平面到塔架距离的增大而减小,随塔架半径的增大而增大,轮毂高度和风剪效应对闪变的影响很小.
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