Power output after deducting the losses be considered power P50 (probabilities of achieving power output according to the expectation of 50%) as a result of observation of wind measuring only in short time 1 ÷ 3 years, could not be represented correctly for the entire life of the project is 20 years. So need to see uncertainty factors affecting output power in the whole of life project, uncertainty factors include:Notes from the wind data (measuring device, measuring time, models ...)Notes from the variation of the wind according to the yearNotes from the predicted loss of power.Refer to a number of wind power projects in Vietnam and through calculation, the real value in 20 years time is selected is 8% to calculate power output P75 (probability of achieving power output according to the expectation is 75%) and P90 (probability of achieving power output according to the expectation is 90%) according to the following formula :P75 = P50-0, 67x8% xP50 P90 = P50-1, 28x8% xP50Based on the value of losses and uncertainty on the values, the result calculated power output according to the following stages:
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