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Energies 2017, 10(12), 2070; doi:10.3390/en10122070

Latching and Declutching Control of the Solo Duck Wave-Energy Converter with Different Load Types

1
School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China
2
Department of Engineering Science, Uppsala University, 75121 Uppsala, Sweden
3
Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, Guangdong, China
*
Author to whom correspondence should be addressed.
Received: 10 November 2017 / Revised: 22 November 2017 / Accepted: 26 November 2017 / Published: 6 December 2017
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Abstract

The solo duck wave-energy converter (WEC) captures power in a point absorber manner, hence it exhibits high power-capture efficiency within only a narrow bandwidth. Passive control is characterized by a unidirectional power flow, and thus its engineering implementation can be simplified. In this paper, two typical passive control strategies, latching and declutching control, are applied to the solo duck WEC to improve its power-capture performance at wave periods larger and smaller than the natural period of the WEC, respectively. Special attention is paid to the peak value of instantaneous WEC performance parameters, including the peak motion excursion, the peak power take-off (PTO) moment, and the peak-to-average power ratio, when the captured power is maximized. Performance differences between the linear and coulomb loads are also investigated. Results show that both latching and declutching control can effectively improve captured power, but also incidentally increase the peak motion excursion and peak-to-average power ratio. When under latching and declutching control, the coulomb load leads to the same maximum relative capture width and peak motion excursion as the linear load, but presents smaller peak PTO moment and peak-to-average power ratio than the linear load, hence making the coulomb load the better choice for the solo duck WEC. View Full-Text
Keywords: passive control; latching control; declutching control; solo duck; load types passive control; latching control; declutching control; solo duck; load types
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wu, J.; Yao, Y.; Zhou, L.; Göteman, M. Latching and Declutching Control of the Solo Duck Wave-Energy Converter with Different Load Types. Energies 2017, 10, 2070.

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