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DESIGN OF FLOATING SUPPORT STRUCTURE FOR 5 MW OFFSHORE WIND TURBINE

Vivek Philip, Dr. Anitha Joseph, Dr. Lalu Mangal

This paper presents preparatory design of a tension-leg support structure for a 5 MW reference wind turbine [1]. From the design considerations tabbed from past literature, a design method was drawn up, which account for important design considerations such as performance requirements and natural frequencies. The primary design is fine-tuned by adjusting parameters that control natural frequency. Preliminary design so developed was figured out in Sesam software developed by Det Norske Veritas (DNV). Modeling was done in GeniE module and a hydro dynamic analysis was done by WADAM (Wave Analysis by Diffraction and Morison) in HydroD module of Sesam. Natural frequencies and Response Amplitude Operators (RAOs) of proposed structure corresponding to six degrees of freedom are obtained. The design approach developed was validated by comparing with an existing tension legged model [2]. The results presented serve as guidelines in the design process of similar tension-leg support structures for offshore wind turbines