Integration of a semisubmersible floating wind turbine and wave energy converters: an experimental study on motion reduc
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ORIGINAL ARTICLE
Integration of a semisubmersible floating wind turbine and wave energy converters: an experimental study on motion reduction Hongzhong Zhu1 · Changhong Hu2 · Makoto Sueyoshi2 · Shigeo Yoshida2 Received: 9 March 2019 / Accepted: 12 August 2019 © The Japan Society of Naval Architects and Ocean Engineers (JASNAOE) 2019
Abstract The integration of wave energy converters and a floating wind turbine has the potential to reduce the cost of energy, since they can share the mooring system and the infrastructure of the power grid. In this study, oscillating-water-column-type wave energy converters mounted on a semisubmersible-type floating wind turbine are presented. Water tank tests are carried out to illustrate that the wave energy converters can not only capture the wave energy but also help in reducing the motion of the floating platform when active control is applied. This study provides a new perspective on hybrid renewable energy application to widen renewable energy penetration by enhancing system reliability. Keywords Wave energy converter · Floating offshore wind turbine · Motion reduction · Water tank test
1 Introduction The sustainable development of offshore wind energy requires reliable floating platforms. Although the platforms are usually designed with good sea-keeping performance and good stability, environmental forces induced by wind, wave and ocean current can, however, induce undesired motion of the platforms to deteriorate the fatigue life of wind turbines [1–3]. Suzuki and Sato have performed some pioneering work on investigating the effects of floater motion on the strength of offshore wind turbine blades, and it is reported that pitching with an amplitude of 5 ◦ at floater would lead to a 50% increase of blade sectional modulus [4]. Although the floating platforms are designed with sophisticated analysis, Huijs et al. have reported that the maximum * Hongzhong Zhu [email protected]‑u.ac.jp Changhong Hu [email protected]‑u.ac.jp Makoto Sueyoshi [email protected]‑u.ac.jp Shigeo Yoshida [email protected]‑u.ac.jp 1
Research and Education Center for Green Technology, Kyushu University, Fukuoka, Japan
Research Institute for Applied Mechanics, Kyushu University, Fukuoka, Japan
2
inclination of the floaters would also reach 10◦ according to model tests [5]. To further reduce the motions, various methods and state-of-art structures were proposed in the literature. In Refs. [6, 7], novel water-entrapment plates with large horizontal skirts are proposed for a semisubmersible platform. The motion of the platform in heave, roll and pitch direction can be significantly reduced for the increase in the added mass and viscous loads. In Ref. [8], Roddier and Cermelli proposed a new concept of motion reduction for a semisubmersible that the water can be pumped between the columns of the semisubmersible. Although the methods can reduce the motion of the platform, they would also increase the cost of energy and complicate the maintenance system. The ocean waves are the primary s
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