Calculation Model of Wind Energy Output Based on Capacity Factor

The capacity factor shows the annual energy output efficiency of a wind turbine and can be used to evaluate the operation performance of the wind turbine. In this paper, we use the capacity factor to study the operation performance of wind turbines. Firstly, based on the wind speed conditions and the performance parameters of wind turbine devices, the revenue and cost of a wind energy project are calculated. The calculation formula of economic capacity factor is derived by breakeven analysis of the revenue and cost. Secondly, considering different machine types and wind speeds, a simplified physical calculation formula of physical capacity factor is developed. Finally, a case study with actual data in a specified area is presented. The values of economic and physical capacity factors are provided. The differences between them are discussed in detail. The relationship between the mean wind speed and capacity factor is discussed. The result provides a new quantitative basis for selecting wind turbine and farm which are suitable for territorial wind speed conditions.