The wind energy is becoming the mainstream source of the power sector. The installation of the grid-connected wind farm is increasing because of their contribution to the green energy. The power quality is the challenge of the wind energy. Moreover, the critical issue in the measurement of power quality effects such as severity of flicker and harmonic. Therefore, the IEC standards define the measurement procedure for flicker and harmonic. The effects of voltage fluctuations associated with the flicker and the signal distortions are known as harmonics. The measurement of flicker and harmonic to the wind turbine is dealt with in this dissertation. The thesis consists of two parts. The first part described the flicker measurement model and the second part define the harmonics measurement model. The results demonstrated through simulation according to the upgraded version of IEC measurement and assessment standard.