Power and voltage generated by a wind turbine are more variable than that produced by conventional generators. Therefore, with the increasing penetration of wind energy into the grid, it is very important to simulate precisely the wind turbine/grid interaction to evaluate voltage fluctuation and other power quality aspects. In this paper, the wind turbine instantaneously generated power and voltage at the point of common connection (PCC) with grid are simulated by considering all the aerodynamical and mechanical effects, which could affect them. The inherent effect of the wind speed on the entire blade swept area is simulated in the model of the wind speed. This model takes into account the effects of tower shadow and the rotational sampling of turbulence. The generated power is obtained by the simulation of the wind speed time series into a wind turbine model. The proposed wind turbine model includes detailed sub-models of aerodynamic rotor, drive train and ac generator. A dq arbitrary reference frame is used for modeling of asynchronous generator. The flux variations in the stator circuit are involved. The flickermeter model which expresses voltage fluctuations is simulated according to the IEC standard 61000-4-15. The wind speed, wind turbine and flickermeter models are simulated in Matlab/Simulink software. Both of grid and site parameters, which affect voltage fluctuation, are investigated. These parameters have a wide influence on voltage fluctuation and flicker emission levels.
