A feasibility study on downsizing of power take off system of wave energy converters

Conference Paper (2021)
Author(s)

J. Tan (TU Delft - Offshore and Dredging Engineering)

H Polinder (TU Delft - Transport Engineering and Logistics)

Peter R. Wellens (TU Delft - Ship Hydromechanics and Structures)

S.A. Miedema (TU Delft - Offshore and Dredging Engineering)

Research Group
Ship Hydromechanics and Structures
DOI related publication
https://doi.org/10.1201/9781003134572-18
More Info
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Publication Year
2021
Language
English
Research Group
Ship Hydromechanics and Structures
Pages (from-to)
140-148
ISBN (electronic)
978-0-367-68131-9

Abstract

PTO (Power Take-off) systems in WECs (Wave Energy Converters) are generally overrated with regard to the average extracted power, which is not economically favourable. However, there is no explicit and agreed approach on how to limit the absorbed power without damaging WECs. In this work, a generic point absorber and direct drive PTO are used as research objects. A frequency domain model and a cost model are established. Two possible approaches for downsizing PTO rating are investigated. The first approach is established by switching the control strategy of WECs between reactive control and passive control for making a compromise between extracted power and PTO rating. Alternatively, a novel design is proposed by integrating an adjustable draft system of buoy to release the excessive absorbed power. Based on the results, the performance of these two approaches are investigated and the techno-economic performance of these two approaches are compared.

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