| dc.description.abstract | This study accesses the damage of offshore wind turbine towers under extreme wind
conditions in Taiwan with the axial characteristic stress evaluated by European standards, and
establishes the vulnerability curve of offshore wind turbine towers to make contribution to the
future development of the offshore wind turbine industry in Taiwan.
A reference wind turbine model with a rated power of 15 MW is used to simulate the
parameters of the OpenFAST scenario developed by NREL, a renewable energy research
laboratory in the United States, for wind turbines. The overall structural force behavior of the
wind turbine model was analyzed in the range of wind speed from 30m/s to 100m/s. In addition,
5000 sets of random tower sections were simulated by Monte Carlo method, and the axial
characteristic stresses were calculated according to the European standard EN1993-1-6 【22】,
and the damage degree of the 5000 sets of tower sections in each scenario was determined by
stress comparison. The damage rate of the tower structure under different wind speeds can be
estimated from the graphs.
According to the results of the study, deviation of different angles may cause different
levels of damage to the offshore fan , the single fan rotational deviation of 70 degrees will cause
the earliest damage to the tower column structure, followed by the nacelle rotational
misalignment of 15 degrees, and finally the nacelle rotational misalignment of 8 degrees.
Although the nacelle rotation of 8 degrees is still in a safe condition, when the angle error
continues to increase, the damage to the offshore fan may increase significantly. | en_US |