In-service condition analysis of semi-submersible floating wind turbines based on measured data:Taking the"CNOOC Guanlan"as an example
Semi-submersible floating wind turbines in service in the deep and distant sea face a complex marine environment.Monitoring and analyzing their environment and motion response is of great significance to ensure the safe operation and maintenance of the platform and the subsequent optimization of its design.Based on the measured marine environment and platform motion data from the integrated intelligent monitoring system of"CNOOC Guanlan",this study analyzes the environmental conditions of the"CNOOC Guanlan"wind turbine platform and the distribution characteristics of the platform inclination and investigates the motion response of the platform under typhoon conditions.On this basis,the differences between the design indexes of the platform and their measured results are judged.Finally,a hydrodynamic simulation model of the platform is established,and the predicted results of the model are compared with the measured results.The results show the followings.①During the typhoon,the extreme green water phenomenon leads to the deviation of the sensor measurement,and after the wind and wave time history curves are transformed by the translation and scaling method,it is basically in line with the trend of the actual marine environment.The environmental monitoring results show that the design of"CNOOC Guanlan"has a high degree of safety redundancy.② During the measurement period,the roll and pitch extrema of the platform are all within the normal power generation inclination.The 3-hour maximum of inclination basically follows the Gumbel distribution,according to which it is predicted that the platform inclination extrema under the environmental conditions of one in a year,one in ten years,and one in a hundred years will be 5.51°,6.71°,and 7.90°,respectively.While they are higher than the critical power generation inclination,the platform's safety can be guaranteed under the protection of the platform shutdown in typhoon.③ Under the typhoon condition,the natural period of the actual motion of the platform is close to the design period,and the response of the platform under the actual sea state is basically in line with the design expectation.The numerical calculation results of the platform hydrodynamic model are in good agreement with the measured values,and the simulation results can realistically reflect the actual working state of the wind turbine.The results of the study provide a reference for the safe operation and maintenance of"CNOOC Guanlan"and the optimization design of similar platforms.
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