scholarly journals Analysis and wave tank verification of the performance of point absorber WECs with different configurations

2021 ◽  
Author(s):  
Xiaofan Li ◽  
Dillon Martin ◽  
Boxi Jiang ◽  
Shuo Chen ◽  
Krish Thiagarajan ◽  
...  
Keyword(s):  
Wave Tank ◽  
Point Absorber

Performance Improvement of a Point Absorber Wave Energy Converter by Application of an Observer-Based Control: Results From Wave Tank Testing

2015 ◽  
Vol 51 (4) ◽  
pp. 3426-3434 ◽  
Author(s):  
Peter Kracht ◽  
Sebastian Perez-Becker ◽  
Jean-Baptiste Richard ◽  
Boris Fischer
Keyword(s):  
Performance Improvement ◽  
Wave Energy ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
Wave Tank ◽  
Point Absorber

scholarly journals Experimental Wave Tank Test for Reference Model 3 Floating-Point Absorber Wave Energy Converter Project

2015 ◽  
Author(s):  
Y. H. Yu ◽  
M. Lawson ◽  
Y. Li ◽  
M. Previsic ◽  
J. Epler ◽  
...  
Keyword(s):  
Wave Energy ◽  
Reference Model ◽  
Wave Energy Converter ◽  
Floating Point ◽  
Energy Converter ◽  
Wave Tank ◽  
Point Absorber ◽  
Tank Test

scholarly journals Performance of a Direct-Driven Wave Energy Point Absorber with High Inertia Rotatory Power Take-off

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2332 ◽  
Author(s):  
Simon Thomas ◽  
Marianna Giassi ◽  
Malin Göteman ◽  
Martyn Hann ◽  
Edward Ransley ◽  
...  
Keyword(s):  
Natural Frequencies ◽  
Cost Effective ◽  
Rotatory Power ◽  
Scale Model ◽  
Absorption Characteristic ◽  
Wave Tank ◽  
Point Absorber ◽  
Physical Scale ◽  
Current Break ◽  
Linear Damping

An alternating rotatory generator using an eddy current break is developed as a physical scale model of a direct-driven floating point absorber power take-off (PTO) for wave tank tests. It is shown that this design is a simple and cost-effective way to get an accurate linear damping PTO. The device shows some beneficial characteristics, making it an interesting option for full scale devices: For similar weights the inertia can be significantly higher than for linear generators, allowing it to operate with natural frequencies close to typical wave frequencies. The influence of the higher inertia on the power absorption is tested using both a numerical simulation and physical wave tank tests. With the increased inertia the PTO is able to absorb more than double the energy of a comparable direct-driven linear generator in some sea states. Moreover, the alternating rotatory generator allows the absorption characteristic to be tuned by changing the inertia and the generator damping.

scholarly journals Passive Model Predictive Control on a Two-Body Self-Referenced Point Absorber Wave Energy Converter

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1731
Author(s):  
Dan Montoya ◽  
Elisabetta Tedeschi ◽  
Luca Castellini ◽  
Tiago Martins
Keyword(s):  
Model Predictive Control ◽  
Predictive Control ◽  
Wave Energy ◽  
Power Flow ◽  
Linear Constraints ◽  
Wave Energy Converter ◽  
Control Technique ◽  
Computational Time ◽  
Energy Converter ◽  
Point Absorber

Wave energy is nowadays one of the most promising renewable energy sources; however, wave energy technology has not reached the fully-commercial stage, yet. One key aspect to achieve this goal is to identify an effective control strategy for each selected Wave Energy Converter (WEC), in order to extract the maximum energy from the waves, while respecting the physical constraints of the device. Model Predictive Control (MPC) can inherently satisfy these requirements. Generally, MPC is formulated as a quadratic programming problem with linear constraints (e.g., on position, speed and Power Take-Off (PTO) force). Since, in the most general case, this control technique requires bidirectional power flow between the PTO system and the grid, it has similar characteristics as reactive control. This means that, under some operating conditions, the energy losses may be equivalent, or even larger, than the energy yielded. As many WECs are designed to only allow unidirectional power flow, it is necessary to set nonlinear constraints. This makes the optimization problem significantly more expensive in terms of computational time. This work proposes two MPC control strategies applied to a two-body point absorber that address this issue from two different perspectives: (a) adapting the MPC formulation to passive loading strategy; and (b) adapting linear constraints in the MPC in order to only allow an unidirectional power flow. The results show that the two alternative proposals have similar performance in terms of computational time compared to the regular MPC and obtain considerably more power than the linear passive control, thus proving to be a good option for unidirectional PTO systems.

scholarly journals Numerical evaluation of a two-body point absorber wave energy converter with a tuned inerter

2021 ◽  
Vol 171 ◽  
pp. 217-226
Author(s):  
Takehiko Asai ◽  
Keita Sugiura
Keyword(s):  
Wave Energy ◽  
Numerical Evaluation ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
Point Absorber ◽  
Body Point

Power production of the hybrid Wavestar point absorber mounted around the Hywind spar platform and its dynamic response

2021 ◽  
Vol 13 (3) ◽  
pp. 033308
Author(s):  
Hamid Reza Ghafari ◽  
Atefeh Neisi ◽  
Hassan Ghassemi ◽  
Mehdi Iranmanesh
Keyword(s):  
Dynamic Response ◽  
Power Production ◽  
Spar Platform ◽  
Point Absorber

scholarly journals Numerical and Experimental Studies on a Three-Dimensional Numerical Wave Tank

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 6585-6593 ◽  
Author(s):  
Xiaojie Tian ◽  
Qingyang Wang ◽  
Guijie Liu ◽  
Wei Deng ◽  
Zhiming Gao
Keyword(s):  
Experimental Studies ◽  
Three Dimensional ◽  
Numerical Wave Tank ◽  
Wave Tank ◽  
Numerical Wave

A heaving point absorber-based ocean wave energy convertor hybridizing a multilayered soft-brush cylindrical triboelectric generator and an electromagnetic generator

Nano Energy ◽  
2021 ◽  
pp. 106381
Author(s):  
Bo Zhao ◽  
Zihao Li ◽  
Xinqin Liao ◽  
Longfei Qiao ◽  
Yiran Li ◽  
...  
Keyword(s):  
Wave Energy ◽  
Ocean Wave ◽  
Point Absorber ◽  
Ocean Wave Energy ◽  
Electromagnetic Generator ◽  
Triboelectric Generator
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