Abstract
Two different concepts of wave energy converter coupled to the novel C-GEN linear generator have been studied numerically, including the evaluation of different buoy sizes. The first concept has a slack connection between the buoy and the generator on the seabed. Another concept is based on a stiff connection between the buoy and the generator placed on an offshore platform. Three different approaches to calculate the damping force have been utilized within this study: the optimal damping coefficient, R-load, and RC-load. R-load is a model for the load applied to a grid-connected generator with passive rectification. RC-load is a model for a phase angle compensation applied to a system with active rectification. The radiation forces originating from the oscillatory motion of the buoy have been approximated using the transfer function in the frequency domain and the vector fitting algorithm. A comparison of the approximation methods is presented, and their accuracy has been evaluated. The advantage of the vector fitting method has been shown, especially for higher approximation orders which fit the transfer function with high accuracy. The study’s final results are shown in terms of the absorbed power for the sea states of March 2018 at Wave Hub, UK.
Highlights
The waves essential in wave energy conversion are the surface waves created by wind
The absorbed power of wave energy converters (WECs) is subject to seasonal variations
Two point absorber WEC concepts coupled to the novel liner permanent magnet generator C-GEN have been investigated
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The abundant potential of wave energy [1] for the green energy market is captivating for engineers and scientists across the world. Many mechanisms contribute to the motions of the ocean surface: atmospheric pressure gradients, wind, moon gravitation, and even seismic activity. The waves essential in wave energy conversion are the surface waves created by wind. Six degrees of freedom characterize the free motion of a floating body
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