Abstract:Free stream wind speed is one of the most important parameters of wind turbine generator power curve evaluation, postwarranty acceptance and operation. Traditional method is to use anemometer tower with the drawback of long test term, high test cost and difficult construction, especially in complex terrain. Based on IEC 61400-12-1—2015 standard, utilizing of high accuracy, wide range and easy to installation laser radar anemoscope, a series of free stream wind speed measure method that suit for complex terrain was indicated. After taking tests of free stream wind speed by airborne radar anemoscope in different distance, free stream wind speed can be determined based on wind speed variation trend. The accuracy and reliability of wind speed can be verified by land laser radar anemoscope. Based on the experiment carried out in a wind power plant in Yunnan, the test method is effective.

Keywords:free stream wind speed, complex terrain, laser radar anemoscope, wind turbine generator, test method