Study on Energy Loss Calculation During Wind Power Curtailment Based on Mast Data

To assess the energy loss of wind farm during wind power curtailment accurately, a method to calculate wind power curtailment of a wind farm, which is called mast trend extrapolation, is proposed. Wind speed of mast nearby is used as input data in this method. Considering effects of wind farms area topography, roughness change and wake effect on local wind speed in the wind farm, this approach builds wind farm numerical model. By using theory of micro meteorology, mast wind speed is extrapolated to each turbine at hub height. The turbine power is available combining the theory power curve. Wind farm theory power is accumulated by each turbine's theory power. And then wind power curtailment is available. From the essence of development and change of wind speed, the approach according to the actual characteristics of wind farm, through the data modeling, simulation calculate the actual flow of wind speed in wind farms. Applying both mast trend extrapolation method and general sample turbine method in wind power curtailment calculation of a wind farm, it shows that the calculation precision of mast trend extrapolation method is higher than sample turbine method, which can meet the requirement of engineering application.