Investigation on Evaluation Factors of Wind Turbine Efficiency
Date Issued
2006
Date
2006
Author(s)
Tsai, Chih-Wei
DOI
zh-TW
Abstract
The efficiency of thermal, hydraulic, and nuclear power plants can be evaluated by using capacity factor, due to the fact that fuels are continually supplied and properly managed. On the other hand, wind velocity is the fuel of wind turbine. It is never steady and has the cubic relationship with wind energy. Small perturbation in wind speed can result in substantial difference in wind energy. It is thus not adequate to only use capacity factor in the evaluation of wind power plants. Chang et al. (2003) suggests that three wind turbine parameters (capacity factor, wind turbine efficiency and availability factor) have to be considered in analyzing wind energy production.
Based on the result of Chang et al. (2003), the main objective of this study is to further investigate the above three wind turbine parameters and their relationship with wind turbine characteristics (such as cut-in velocity, rated velocity, and wind characteristics). Eight different wind turbines at four strong-wind meteorological stations (Wuchi, Tungchitao, Lanyu and Hengchun) in Taiwan are tested. The simulated results show that the slope of the power curve (from cut-in to rated velocity) greatly affects capacity factor of wind turbine. It is concluded that capacity factor can distinguish wind energy production in strong and weak wind periods. However, it cannot be used to determine the suitability of wind turbine installation due to its low recognition of wind turbine characteristics. In contrast, wind turbine efficiency can be applied to demonstrate the optimal wind turbine under different turbine characteristics. Finally, availability factor is classified into un-rated availability factor and rated availability factor, which can clearly express the detailed information of wind turbine operation.
Subjects
負載因子
效率因子
可操作因子
切入風速
率定風速
Capacity factor, wind turbine efficiency
availability factor
cut-in velocity
rated velocity
Type
thesis
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