Coupled Dynamic Response Analysis of A Multi-Column Tension-Leg-Type Floating Wind Turbine |
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| Authors: | ZHAO Yong-sheng YANG Jian-min HE Yan-ping and GU Min-tong |
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| Institution: | State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200030, China;State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200030, China;State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200030, China;State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200030, China |
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| Abstract: | This paper presents a coupled dynamic response analysis of a multi-column tension-leg-type floating wind turbine (WindStar TLP system) under normal operation and parked conditions. Wind-only load cases, wave-only load cases and combined wind and wave load cases were analyzed separately for the WindStar TLP system to identify the dominant excitation loads. Comparisons between an NREL offshore 5-MW baseline wind turbine installed on land and the WindStar TLP system were performed. Statistics of selected response variables in specified design load cases (DLCs) were obtained and analyzed. It is found that the proposed WindStar TLP system has small dynamic responses to environmental loads and it thus has almost the same mean generator power output under operating conditions as the land-based system. The tension mooring system has a sufficient safety factor, and the minimum tendon tension is always positive in all selected DLCs. The ratio of ultimate load of the tower base fore-aft bending moment for the WindStar TLP system versus the land-based system can be as high as 1.9 in all of the DLCs considered. These results will help elucidate the dynamic characteristics of the proposed WindStar TLP system, identify the difference in load effect between it and land-based systems, and thus make relevant modifications to the initial design for the WindStar TLP system. |
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| Keywords: | floating wind turbine windStar TLP coupled dynamic response operating and parked condition |
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