Resonance Control Based on Hydrodynamic Analysis for Underwater Direct Drive Wave Energy Converter

Wave energy has great prospect among many forms of marine renewable energy for its high density and storage. This paper proposes an underwater direct drive wave energy converter (UDDWEC), which is composed of a submerged point absorbing buoy and a linear-rotating axial flux permanent magnetic genera...

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Bibliographic Details
Published in:Journal of marine science and engineering 2021-11, Vol.9 (11), p.1192
Main Authors: Li, Yang, Huang, Lei, Tan, Peiwen, Chen, Minshuo, Chen, Junquan
Format: Article
Language:English
Subjects:
Algorithms
Alternative energy sources
Amplitude
Amplitudes
Analysis
Buoys
Control
Converters
Damping
direct drive wave energy converter
Dynamic models
Energy conversion
Environmental management
Fluid mechanics
Force and energy
hydrodynamic analysis
Hydrodynamics
linear-rotating
Magnetic fields
Magnetic flux
Marine energy
Radiation
Reliability analysis
Renewable energy
Renewable resources
Resonance
resonance control
Resource management
Storage
Underwater
Velocity
Wave energy
Wave height
Wave power
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Summary:Wave energy has great prospect among many forms of marine renewable energy for its high density and storage. This paper proposes an underwater direct drive wave energy converter (UDDWEC), which is composed of a submerged point absorbing buoy and a linear-rotating axial flux permanent magnetic generator (LR-AFPMG). In addition, a maximum energy capture control strategy, resonance control, is derived for UDDWEC, based on small amplitude oscillation and hydrodynamic analysis. The proposed control strategy assumes the availability of sea condition such as wave height and period. This control strategy has three main characteristics. Firstly, this control strategy is derived based on hydrodynamic analysis of the submerged point absorber. Added mass, radiation damping and other hydrodynamic parameters are obtained to participate in UDDWEC dynamic model. Secondly, a LR-AFPMG is applied as power take-off device to realize energy conversion, which can improve the power density. Thirdly, small amplitude oscillation can be changed into long stroke rotary motion through the LR-AFPMG. The reliability and effectiveness of the proposed control strategy are assessed at various operation conditions for a heaving system and the validity for the UDDWEC is verified.
ISSN:2077-1312
2077-1312
DOI:10.3390/jmse9111192