Abstract
Small wind turbines are spreading for the purpose of independent or domestic power suppliers. However its standard of strength is still being discussed. In this paper, IEC61400-1 Ed.3 DLC (Design Load Case) 1.1 for large wind turbines is applied for a small wind turbine and estimated its applicability. DLC 1.1 requires load estimation with extrapolation for 50 year return load. Target turbine is "AIRDORPHIN GTO" and aero-elastic simulation tool FAST is used. As a result the target turbine has various load characteristic in its operation modes; normal mode and stall mode. For this reason, an extrapolation method which considers operation modes is tried and established.
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