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Purpose of the study is to investigate the effect of terrain on the performance measurement of a wind turbine generator system in complex terrain. Since the wind energy captured by the rotor plane of wind turbine is proportional to the 3rd power of wind speed, the exact estimation of the wind speed at the point of wind turbine is necessary. However, the definitive method for the wind speed estimation in complex terrain has not yet been established. To predict the local flow field in complex terrain, many researchers have proposed numerical methods and applied their models to very complicated situation such as an actual topography where is not easy to clarify their adequacy. Since a few comprehensive studies on the terrain shapes have been performed, detailed and general understandings of the flow over complex terrain are insufficient for the estimation of the wind energy resources and the performance evaluation of a wind turbine in complex terrain. In this study, the experimental approach by wind-tunnel testing was taken and compared with open air field data.

Study on the Wind Measurements and Performance Evaluation of a WTGS in Complex Terrain (3rd Report, Influence of Escarpment Shapes)