The integrated floating energy system(IFES)comprising floating offshore wind turbines(FOWTs)and wave energy converters(WECs)presents a promising solution for reducing energy costs and enhancing motion stability.This s...The integrated floating energy system(IFES)comprising floating offshore wind turbines(FOWTs)and wave energy converters(WECs)presents a promising solution for reducing energy costs and enhancing motion stability.This study develops an innovative barge-type IFES integrated with multiple Wavestar prototype WECs to address this research need.A fully coupled framework is proposed for the aero-hydro-servo-elastic dynamic analysis of the windwave IFES concept under environmental conditions.The study analyzes time-varying platform motions and power characteristics of the IFES concepts compared to the FOWT.Results indicate that the standard deviations of platform roll and pitch decrease significantly due to the WEC integration under the most examined load cases(LCs).The system achieves a maximum reduction of 71.04%in rolling fluctuation under 16 m/s wind speed,while platform pitch decreases by 49.65%.The IFES demonstrates increased output power across all examined LCs,while tower-base loads decrease by over 20%under a wind velocity of 11 m/s.Additionally,the results indicate that the rotational dynamics of the IFES deteriorate with increasing wave period,as resonance arises when the wavelength exceeds twice the separation distance between the platform and the WEC.This phenomenon was further verified through three modified design concepts.These findings provide valuable references for offshore wind-wave hybrid system design.展开更多
基金financially supported by the National Key Research and Development Program of China(Grant No.2023YFE0102000)Grant-in-Aid for Early-Career Scientists(Grant No.JP22K143)+4 种基金the National Natural Science Foundation of China(Grant No.52101317)the National“111”Centre on Safety and Intelligent Operation of Sea Bridge(Grant No.D21013)the Natural Science Foundation of Zhejiang Province(Grant No.LQ22E090001)Ningbo Municipal Natural Science Foundation(Grant No.2023J091)RIAM International Standard Joint Research of Kyushu University(Grant No.24RE-5).
文摘The integrated floating energy system(IFES)comprising floating offshore wind turbines(FOWTs)and wave energy converters(WECs)presents a promising solution for reducing energy costs and enhancing motion stability.This study develops an innovative barge-type IFES integrated with multiple Wavestar prototype WECs to address this research need.A fully coupled framework is proposed for the aero-hydro-servo-elastic dynamic analysis of the windwave IFES concept under environmental conditions.The study analyzes time-varying platform motions and power characteristics of the IFES concepts compared to the FOWT.Results indicate that the standard deviations of platform roll and pitch decrease significantly due to the WEC integration under the most examined load cases(LCs).The system achieves a maximum reduction of 71.04%in rolling fluctuation under 16 m/s wind speed,while platform pitch decreases by 49.65%.The IFES demonstrates increased output power across all examined LCs,while tower-base loads decrease by over 20%under a wind velocity of 11 m/s.Additionally,the results indicate that the rotational dynamics of the IFES deteriorate with increasing wave period,as resonance arises when the wavelength exceeds twice the separation distance between the platform and the WEC.This phenomenon was further verified through three modified design concepts.These findings provide valuable references for offshore wind-wave hybrid system design.
