Determination of characteristic wind speed for wind power under conditions of low cost and constant power

In this paper, the wind atlas was presented using the WAsP software based on the wind resource data of four regions in Inner Mongolia during 1998-2008, which were provided by the China meteorological date sharing service system. The scale parameter A and the shape parameter k of Weibull probability density distribution function could be calculated. Furthermore, the cut-in wind speed and rated wind speed for four regions in Inner Mongolia under different wind resource condition were also estimated in this study by employing Weibull two-parameter method. Considering the reduction of the cost, the rated wind speed was optimized and the diameter of wind rotor was shortened without changing the power rating of the wind turbine. It was found that, after optimization of wind turbine, the annual energy production per unit area calculated by the WasP software was significantly improved by 16%~360%.