Abstract: Power curve is an important index to evaluate the performance of wind turbines. The power curve calculated by Nacelle Transfer Function is efficient，fast and comprehensive.A comprehensive analysis on three main Nacelle Transfer Functions was made. Among them，the momentum theory correction method based on momentum theory stream tube model is used to calculate the free flow wind speed according to the nacelle wind speed and power .The Binned-NTF correction method and the high-order polynomial partition fitting correction method use the nacelle wind speed and the wind speed measured by LiDAR to correct the wind speed based on the least square method. The engineering example of a plain wind farm shows that the fitting accuracy of wind speed and the error rate of power generation obtained by fitting methods are better than that made by momentum theory correction method. In the fitting methods，the high-order polynomial partition fitting method is better than the binned NTF method. The power generation error of the three methods is between -2.33% and 5.23%. The momentum theory correction method is affected by the approximation of lower section wind speed and the measurement accuracy of the nacelle anemometer，therefore the power generation error rate is slightly larger. In conclusion，the measurement accuracy of nacelle anemometer will affect the accuracy of NTF methods，and the high-order polynomial partition fitting correction method is better than the other two NTF methods.

Key words: Nacelle Transfer Function, power curve, wind turbine, function fitting, momentum theory, deviation of power generation, accuracy of measurement