Performance of Linear Generator Designs for Direct Drive Wave Energy Converter under Unidirectional Long-Crested Random Waves

Budi Azhari, Fransisco Danang Wijaya and Edwar Yazid
Additional contact information
Budi Azhari: Research Center for Electrical Power and Mechatronics, Indonesian Institute of Sciences, Jl. Sangkuriang, Dago, Bandung 40135, Indonesia
Fransisco Danang Wijaya: Department of Electrical Engineering and Information Technology, Universitas Gadjah Mada, Jl. Grafika, Sleman, Yogyakarta 55281, Indonesia
Edwar Yazid: Research Center for Electrical Power and Mechatronics, Indonesian Institute of Sciences, Jl. Sangkuriang, Dago, Bandung 40135, Indonesia

Energies, 2021, vol. 14, issue 16, 1-28

Abstract: For generating electricity, direct-drive wave energy converters (WECs) with linear permanent magnet generators (LPMGs) have advantages in terms of efficiency, simplicity, and force-to-weight ratio over WEC with rotary generators. However, the converter’s work under approaching-real wave conditions should be investigated. This paper studies the performance of a pico-scale WEC with two different LPMGs under unidirectional long-crested random waves. Different significant wave heights (using data in the Southern Ocean of Yogyakarta, Indonesia) and peak frequencies are tested. The JONSWAP energy spectrum is used to extract the wave elevations, while the MSS toolbox in MATLAB Simulink is employed to solve the floater’s dynamic responses. Next, the translator movements are extracted and combined with the flux distribution from FEMM simulation and analytical calculation, and the output powers are obtained. An experiment is conducted to test the output under constant speed. The results show for both designs, different tested significant wave height values produce higher output powers than peak frequency variation, but there is no specific trend on them. Meanwhile, the peak frequency is inversely proportional to the output power. Elimination of the non-facing events results in increasing output power under both parameters’ variation, with higher significant wave height resulting in a bigger increase. The semi iron-cored LPMG produces lower power loss and higher efficiency.

Keywords: iron-cored; semi iron-cored; LPMG; significant wave height; peak frequency; random wave; output power (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.mdpi.com/1996-1073/14/16/5098/pdf (application/pdf)
https://www.mdpi.com/1996-1073/14/16/5098/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:14:y:2021:i:16:p:5098-:d:617146

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().