Performance analysis and tank test validation of a hybrid ocean wave-current energy converter with a single power takeoff

Jiang, Boxi; Li, Xiaofan; Chen, Shuo; Xiong, Qiuchi; Chen, Bang-fuh; Parker, Robert G.; Zuo, Lei

doi:10.1016/j.enconman.2020.113268

Title: Performance analysis and tank test validation of a hybrid ocean wave-current energy converter with a single power takeoff

Journal Article · Thu Sep 03 00:00:00 EDT 2020 · Energy Conversion and Management

DOI:https://doi.org/10.1016/j.enconman.2020.113268· OSTI ID:1659232

Jiang, Boxi ^[1]; Li, Xiaofan ^[1]; Chen, Shuo ^[1]; Xiong, Qiuchi ^[1]; Chen, Bang-fuh ^[2];

^[3];

^[1]

Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
National Sun Yat-sen Univ., Kaohsiung (Taiwan)
Univ. of Utah, Salt Lake City, UT (United States)

This paper introduces a hybrid ocean wave-current energy converter (HWCEC) that harvests energy from ocean waves and current simultaneously with a single power takeoff (PTO). Specifically, the wave energy is extracted through relative heaving motion between a floating buoy and a submerged second body, while the current energy is extracted using a marine current turbine (MCT). Energy from both sources are integrated by a hybrid PTO whose concept is based on a mechanical motion rectifier (MMR). The hybrid PTO with two one-way clutches converts bidirectional, up-and-down motion from the waves into unidirectional rotation of the generator. Meanwhile a third one-way clutch couples the MCT with the same generator. The wave and current can simultaneously or separately drive the same generator through different engagement and disengagement statuses of the one-way clutches. Time-domain simulation is conducted with hydrodynamic coefficients obtained from computational fluid dynamics analysis and boundary element method. Tank tests were conducted for a HWCEC under co-existing wave and current inputs. For comparison, separate baseline tests of a turbine and a two-body point absorber, each acting in isolation, are conducted. Experimental results validate the dynamic modeling and show that a HWCEC can increase the output power with a range between 29-87% over either current turbine and wave energy converter acting individually, and it can reduce by up to 70% the peak-to-average power ratio compared with the wave energy converter on the tested conditions.

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Research Organization:: Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Water Power Technologies Office; European Union Horizon 2020 Framework Programme (H2020)

Grant/Contract Number:: EE0007174; 731084

OSTI ID:: 1659232

Alternate ID(s):: OSTI ID: 1777007

Journal Information:: Energy Conversion and Management, Vol. 224; ISSN 0196-8904

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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