A study of a speed amplified linear generator for low-frequency wave energy conversion

[Display omitted] •A novel design of a direct drive ocean wave energy converter with a speed amplification power take-off system.•The relative speed of the translator with respect to the coil is doubled through a fixed pulley wheel mechanism.•Analytical and simulation models of the system in both re...

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Bibliographic Details
Published in:Mechanical systems and signal processing 2021-02, Vol.149, p.107226, Article 107226
Main Authors: Liu, Zhenwei, Wang, Xu, Al Shami, Elie, Baker, Nick J., Ji, Xueyu
Format: Article
Language:English
Subjects:
Amplification
Boundary element method
CAD
Computer aided design
Converters
Coupling coefficients
Damping
Electromagnetic coupling
Energy conversion
Hydrodynamic
Linear generator
Low frequency
Mathematical models
Parameters
Simulation
Speed amplified
Wave energy converter
Wave power
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Summary:[Display omitted] •A novel design of a direct drive ocean wave energy converter with a speed amplification power take-off system.•The relative speed of the translator with respect to the coil is doubled through a fixed pulley wheel mechanism.•Analytical and simulation models of the system in both regular waves and irregular waves.•A parameter study of the wave-energy converter for an optimal design. This paper proposes a new method of speed amplification for a direct drive ocean wave energy converter. The relative speed of the stator and translator of a linear generator is doubled through a fixed pulley wheel mechanism. Analytical and simulation models of the system have been developed and simulated considering the mechanical damping and electrical damping coefficients. The models have been simulated in both the regular waves and irregular waves where hydrodynamic parameters for different heaving buoys are calculated from hydrodynamic boundary element analysis simulation using the ANSYS AQWA software. The relative displacement, output voltage and harvested power of the speed amplified wave energy converter system have been obtained in the frequency and time domains. The frequency and time domain models were validated through comparing the peak output power values at different frequencies. The generator parameters of electromagnetic coupling coefficient, or the power take-off (PTO) electrical damping coefficient and external resistance were studied to ensure an optimal wave-energy converter (WEC) design.
ISSN:0888-3270
1096-1216
DOI:10.1016/j.ymssp.2020.107226