The wind power curve is not only an important basis for control system design, and it is also an important index of wind turbine power performance evaluation and assessment of wind turbine.

     The wind power curve is the important feedback signal which directly affect the parameter control strategy and control in the process of adjustment.

    From a practical perspective, the manufacturers of wind turbines firstly submit the power curve of wind turbine to the owners when they offer the turbines. The wind power curve is an important reference for the owners, and it is an important indicators of the turbine actual working conditions and basis of operating adjustment.

    If the measured power curves beyond the standard power curve, it explains the turbines overworked with high risk coefficient. This state will not only affect the lifetime of the turbine, and bring an unexpected situation. If the measured power curve is lower than the standard the power curve, it shows the turbine is not up to the running status of the design plan, meanwhile it will affect the generating capacity of the whole project, decline the return rate of investor's investment.  It is a huge economic benefits loss for the owners, so the wind power curve verification is necessary and meaningful for scholars, equipment manufacturers and owners.

    In order to assess the performance of a wind turbine, Power Curve measurements are usually performed. It allows measuring the correlation between the wind speed and the output power of the turbine.

Wind Profile Lidar is the equipment of choice for such measurement as it measures very accurately and along all the rotor the wind speed and wind direction.