5MW離岸參考風機桁架式支撐結構之時域疲勞分析與損傷評估

基於建立國內離岸風機系統之動態負載計算程序（Load Calculation Procedure，LCP），核能研究所引進國際能源總署所執行之離岸風機研究計畫OC4（Offshore Code Comparison Collaboration Continuation）之技術內容，選用5MW參考風機結合桁架式（Jacket-type）支撐結構進行時間域疲勞分析，參考國際設計標準IEC61400-3並考量國內風場之風、波浪、洋流與土壤等環境條件，以序列分析法（Sequentially coupled approaches）進行整體及局部之兩階段結構動態負載分析計算，完成疲勞分析與結構疲勞損傷評估。研究結果顯示，風力負載相較於波浪為主控疲勞損傷之環境負載，正常運轉發電期間引致之疲勞損傷占總損傷達95％以上，本研究成果可作為未來國內在離岸風機支撐結構負載計算程序、設計分析與驗證之參考依據。

關鍵字

疲勞分析；離岸風機；桁架式支撐結構

並列摘要

To establish the dynamic load calculation procedures for OWTS (offshore wind turbine systems) under domestic environmental conditions, INER (Institute of Nuclear Energy Research) developed the technology of design verification and engineering for offshore wind turbine and its substructure (INER-OC4) in 2014 through introducing the Offshore Code Comparison Collaboration Continuation (OC4) research outcomes conducted by the IEA (International Energy Agency) in 2010. This paper is to perform a series of fatigue analyses for reference offshore wind turbine (OWT) under Taiwan local environmental conditions to investigate the potential design load cases (DLCs) which could affect the overall calculation procedure and improve the design calculation efficiency. Based on the sequential approach, NREL FAST and ANSYS software are employed to analyze the dynamic responses of offshore wind turbine system and jacket-type substructure under various DLCs defined in the international standard IEC 61400-3 and conducted fatigue analyses and damage assessments. The computed results show fatigue damage caused by power production design scenario is more dominant and accounting for the ratio of total cumulative fatigue damage up to 95%. This work with more efficient load calculation procedure (LCP) in preliminary design will be helpful for cost assessment and selection of adequate types of substructures to be utilized in future offshore wind farms in Taiwan.

並列關鍵字

fatigue analysis ； offshore wind turbine ； jacket-type substructure

國際替代計量

5MW離岸參考風機桁架式支撐結構之時域疲勞分析與損傷評估

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