Abstract
The applications of floating vertical-axis wind turbines (VAWTs) in deep water have been proposed and studied by several researchers recently. However, the feasibility of deploying a floating VAWT at a moderate water depth has not yet been studied. In this paper, this feasibility is thoroughly addressed by comparing the dynamic responses of spar-type VAWTs in deep water and moderate water depth. A short spar VAWT supporting a 5 MW Darrieus rotor at moderate water depth is proposed by following the deep spar concept in deep water. A fully coupled simulation tool, SIMO-RIFLEX-DMS code, is utilized to carry out time domain simulations under turbulent wind and irregular waves. Dynamic responses of the short spar and deep spar VAWTs are analyzed and compared, including the natural periods, wind turbine performance, platform motions, tower base bending moments, and tension of mooring lines. The statistical characteristics of the thrust and power production for both spars are similar. The comparison of platform motions and tower base bending moments demonstrate a good agreement for both spars, but the short spar has better performance in surge/sway motions and side–side bending moments. The 2P response dominates the bending moment spectra for both spars. A significant variation in tension of Mooring Line 1 and a larger corresponding spectrum value are found in the short spar concept. The results indicate that the application of short spar VAWTs is feasible and could become an alternative concept at moderate water depth.
Highlights
The demand for and development of global wind power energy have both significantly increased in the past decades
This paper presents a comparative study of the dynamic response of the short spar and deep
This paperatpresents a comparative study of the dynamic response of the short spar and deep spar vertical-axis wind turbines (VAWTs) the different water depths through a fully coupled
Summary
The demand for and development of global wind power energy have both significantly increased in the past decades. Ugochukwu analyzed the structural dynamic responses of a 5 MW baseline floating VAWT and a 5 MW optimized floating VAWT with the DeepWind Darrieus rotor under steady and turbulent wind conditions [11]. A short spar VAWT with catenary mooring lines carrying a 5 MW Darrieus rotor in a moderate water depth (150 m) is proposed by following the deep spar concept. The dynamic response of the spar-type structure with the VAWT is analyzed through the fully coupled SIMO-RIFLEX-DMS code. Various combinations of irregular wind and wave for operating conditions are utilized to assess the response and performance of both the spar VAWTs. Section 3 presents dynamic response analysis of the short spar and deep spar VAWTs. The power performances for both the spar VAWTs are compared and evaluated. The feasibility of the short spar concept in moderate water conditions is addressed
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