新型漂浮式海上风电基础概念设计和初步动力响应分析

CONCEPTUAL DESIGN AND PRELIMINARY DYNAMIC RESPONSE ANALYSIS OF NOVEL FLOATING OFFSHORE WIND TURBINE FOUNDATION

提出适用于南海200 m水域的新型漂浮式风电基础概念设计,并基于NREL 5 MW风力涡轮机对新型基础进行性能分析。采用莫里森方程和势流理论计算水动力载荷,并利用ANSYS/AQWA软件建立风力机结构与水动力数值模型,探究其在频域范围内的水动力性能,计算分析漂浮式风力机在不同波况下的时域动力响应。结果显示,该基础的固有周期能较好地避开常见波浪的周期范围,避免引起共振,水动力性能良好,在南海某海域1年、20年和50年一遇的3种波况下基础的运动响应均满足规范要求,能保证漂浮式风力机在极端海况下的安全性和稳定性。

This study introduces a novel floating foundation design tailored for the challenging 200 m water depth of the South China Sea.The performance analysis of this innovative foundation concept is centered around the NREL 5 MW wind turbine.Hydrodynamic loading is assessed using the Morrison’s equation and potential flow theory.Employing ANSYS/AQWA software,a comprehensive numerical model of the floating offshore wind turbine(FOWT)and hydrodynamics is established.The investigation delves into the hydrodynamic characteristics of the floating foundation within the frequency domain.Additionally,a detailed assessment of the FOWT’s dynamic response is conducted under diverse wave conditions in the time domain.Notably,the new floating foundation possesses a natural period that strategically avoids resonance with common waves periods,thus demonstrating exceptional hydrodynamic efficacy.The dynamic response analysis reveals that the foundation successfully meets the prescribed criteria for safety and stability under the different wave conditions—spanning 1-year,20-year,and 50-year scenarios—pertaining to the South China Sea’s marine environment.This outcome underscores the foundation’s capability to ensure the FOWT’s integrity and dependability even in the face of extreme sea conditions.