Abstract: Based on a wind power project in Thailand, this paper introduces the design of an onshore wind turbine foundation of a large capacity and super-high tower. This paper also introduces the finite element analysis on the performance of wind turbine foundation in details, and the results are evaluated. The results show that, with the increase of wind turbine foundation dimensions, the stress characteristics and deformation are different from the conventional foundation design. For the similar wind turbine foundations, there is a certain difference in the assumptions and analytical results when using the traditional theoretical method for the foundation design comparing with the actual results. It is necessary to use finite element calculation to validate the design results, especially for the foundation deformation calculation, structural stress and anchor force analysis. 

Key words: wind power, wind turbine foundation, design, finite element analysis