scholarly journals Linear diffraction analysis of the three-float multi-mode wave energy converter M4 for power capture and structural analysis in irregular waves with experimental validation

2016 ◽  
Vol 3 (1) ◽  
pp. 51-68 ◽  
Author(s):  
L. Sun ◽  
J. Zang ◽  
P. Stansby ◽  
E. Carpintero Moreno ◽  
P. H. Taylor ◽  
...  
Keyword(s):  
Structural Analysis ◽  
Diffraction Analysis ◽  
Wave Energy ◽  
Experimental Validation ◽  
Wave Energy Converter ◽  
Irregular Waves ◽  
Energy Converter ◽  
Mode Wave ◽  
Power Capture ◽  
Multi Mode

Optimum Power Capture of a New Wave Energy Converter in Irregular Waves

2009 ◽  
Author(s):  
George A. Aggidis ◽  
Mohammad T. Rahmati ◽  
Robert V. Chaplin ◽  
Andrew P. McCabe ◽  
Majid A. Bhinder ◽  
...  
Keyword(s):  
Control System ◽  
Wave Energy ◽  
Wave Spectrum ◽  
Wave Energy Converter ◽  
Irregular Waves ◽  
Energy Converter ◽  
Mean Power ◽  
Peak Period ◽  
Point Absorber ◽  
Power Capture

This paper presents the optimum power capture of a new point-absorber wave energy converter, in irregular waves. A stepwise control system for the wave energy converter (WEC) is developed. The control system is used to efficiently extract power from irregular waves where amplitudes vary from wave to wave. The Bretschneider spectrum is used in the experiment and the device is ‘tuned’ to the peak period of the sea state. It is shown that this WEC has a reasonable capture width in irregular waves. However, the optimum mean power depends on the wave spectrum, the shape of the collector body, its freeboard and the device pivot depth.

scholarly journals Design Optimisation of a Multi-Mode Wave Energy Converter

2021 ◽  
Author(s):  
Nataliia Sergiienko ◽  
Mehdi Neshat ◽  
Brad Alexander ◽  
Markus Wagner ◽  
Leandro Souza Pinheiro da Silva
Keyword(s):  
Wave Energy ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
Design Optimisation ◽  
Mode Wave ◽  
Multi Mode

scholarly journals A New Bi-Level Optimisation Framework for Optimising a Multi-Mode Wave Energy Converter Design: A Case Study for the Marettimo Island, Mediterranean Sea

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5498 ◽  
Author(s):  
Mehdi Neshat ◽  
Nataliia Y. Sergiienko ◽  
Erfan Amini ◽  
Meysam Majidi Nezhad ◽  
Davide Astiaso Garcia ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Wave Energy ◽  
Average Power ◽  
Wave Energy Converter ◽  
Domain Model ◽  
Energy Converter ◽  
Mode Wave ◽  
Prototype Development ◽  
Cost Of Energy ◽  
Multi Mode

To advance commercialisation of ocean wave energy and for the technology to become competitive with other sources of renewable energy, the cost of wave energy harvesting should be significantly reduced. The Mediterranean Sea is a region with a relatively low wave energy potential, but due to the absence of extreme waves, can be considered at the initial stage of the prototype development as a proof of concept. In this study, we focus on the optimisation of a multi-mode wave energy converter inspired by the CETO system to be tested in the west of Sicily, Italy. We develop a computationally efficient spectral-domain model that fully captures the nonlinear dynamics of a wave energy converter (WEC). We consider two different objective functions for the purpose of optimising a WEC: (1) maximise the annual average power output (with no concern for WEC cost), and (2) minimise the levelised cost of energy (LCoE). We develop a new bi-level optimisation framework to simultaneously optimise the WEC geometry, tether angles and power take-off (PTO) parameters. In the upper-level of this bi-level process, all WEC parameters are optimised using a state-of-the-art self-adaptive differential evolution method as a global optimisation technique. At the lower-level, we apply a local downhill search method to optimise the geometry and tether angles settings in two independent steps. We evaluate and compare the performance of the new bi-level optimisation framework with seven well-known evolutionary and swarm optimisation methods using the same computational budget. The simulation results demonstrate that the bi-level method converges faster than other methods to a better configuration in terms of both absorbed power and the levelised cost of energy. The optimisation results confirm that if we focus on minimising the produced energy cost at the given location, the best-found WEC dimension is that of a small WEC with a radius of 5 m and height of 2 m.

scholarly journals Experimental Analysis of a Novel Adaptively Counter-Rotating Wave Energy Converter for Powering Drifters

2019 ◽  
Vol 7 (6) ◽  
pp. 171 ◽  
Author(s):  
Guoheng Wu ◽  
Zhongyue Lu ◽  
Zirong Luo ◽  
Jianzhong Shang ◽  
Chongfei Sun ◽  
...  
Keyword(s):  
Wave Energy ◽  
Wave Energy Converter ◽  
Irregular Waves ◽  
Surface Velocity ◽  
Small Scale ◽  
Power Constraint ◽  
Energy Converter ◽  
Wave Tank ◽  
Wide Range ◽  
Rotating Wave

Nowadays, drifters are used for a wide range of applications for researching and exploring the sea. However, the power constraint makes it difficult for their sampling intervals to be smaller, meaning that drifters cannot transmit more accurate measurement data to satellites. Furthermore, due to the power constraint, a modern Surface Velocity Program (SVP) drifter lives an average of 400 days before ceasing transmission. To overcome the power constraint of SVP drifters, this article proposes an adaptively counter-rotating wave energy converter (ACWEC) to supply power for drifters. The ACWEC has the advantages of convenient modular integration, simple conversion process, and minimal affection by the crucial sea environment. This article details the design concept and working principle, and the interaction between the wave energy converter (WEC) and wave is presented based on plane wave theory. To verify the feasibility of the WEC, the research team carried out a series of experiments in a wave tank with regular and irregular waves. Through experiments, it was found that the power and efficiency of the ACWEC are greatly influenced by parameters such as wave height and wave frequency. The maximum output power of the small scale WEC in a wave tank is 6.36 W, which allows drifters to detect ocean data more frequently and continuously.

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