A Method for Estimating the Extreme 10-minute Average and 3-second Wind Speed with a Recurrence Period of 50 Years at the Different Height in a Wind Farm

The extreme 10 minute average and 3 second wind speed with a recurrence period of 50 years at the hub height on a wind farm is a major index for choosing the wind turbines types. From the viewpoint of meteorology, and linking some developed examples of the wind farm projects in China, the article brings forward a sampling method of the maximum 10 minute average wind speed of 5 days from a whole year actual measured wind speed data of a mast at the wind farm. The method refers to the typeⅠ extreme value distribution and the modification matrix estimating the parameters method, for estimating the extreme 10 minute average wind speed with a recurrence period of 50 years at different heights in a wind farm. Using the same period and long term wind speed data of a nearby meteorological station, the above results can be revised. Since the distribution of wind resource has its own specialty in China, the maximum gust coefficient is reduced when the wind speed gets larger in north area of China, and is bigger than 1.4 when the wind farm is influenced by tropical storm or typhoon. It suggests that using the actual observed maximum gust coefficient of the bigger wind speed to estimate the extreme 3 second wind speed with a recurrence period of 50 years at different heights in a wind farm. This method is applied to estimate the extreme 10 minute average and 3 second wind speed with a recurrence period of 50 years at the different heights in the Wulanyiligeng wind farm 300 MW project in Bayannaoer City, Inner Mongolia. The result reveals that the method is convenient and reliable for the Wulanyiligeng wind farm projects developing.