scholarly journals Energy capture optimization for an adaptive wave energy converter

2016 ◽  
Author(s):  
J Barradas-Berglind ◽  
H Meijer ◽  
M van Rooij ◽  
S Clemente-Piñol ◽  
B Galván-García ◽  
...  
Keyword(s):  
Wave Energy ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
Energy Capture

scholarly journals Analysis of a Two-Body Floating Wave Energy Converter With Particular Focus on the Effects of Power Take-Off and Mooring Systems on Energy Capture

2013 ◽  
Vol 135 (3) ◽  
Author(s):  
Made Jaya Muliawan ◽  
Zhen Gao ◽  
Torgeir Moan ◽  
Aurelien Babarit
Keyword(s):  
Wave Energy ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
Mooring Lines ◽  
Energy Capture ◽  
Irregular Wave ◽  
Power Capture ◽  
Actual Operation ◽  
Linear Damping ◽  
Two Bodies

The present paper summarizes analyses of a two-body floating wave energy converter (WEC) to determine the mooring tension and the effect of the mooring system on energy capture. Also, the effect of the power take-off (PTO) is assessed. An axisymmetric Wavebob-type WEC is chosen as the object of investigation. However, the PTO system is modeled in a simplified manner as ideal linear damping and spring terms that couple the motions of the two bodies. The analysis is performed using SIMO, which is a time domain simulation tool that accommodates the simulation of multibody systems with hydrodynamic interactions. In SIMO, docking cone features between the two bodies allow movement as per actual operation, and fenders are applied to represent end stops. Six alternative mooring configurations are applied to investigate the effect of mooring on power capture. Mooring analysis is performed to determine the necessary capacity of mooring lines for each configuration to carry the tension due to the WEC motion in extreme conditions. Hydrodynamic loads are determined using WAMIT. We assumed that the WEC will be operated to capture wave power at the Yeu site in France. The analysis is performed for several regular and irregular wave conditions according to wave data available for that site. Simulations are performed to study the effect of the PTO system, end stops settings and several mooring configurations on power capture.

scholarly journals Influence of Central Platform on Hydrodynamic Performance of Semi-Submerged Multi-Buoy Wave Energy Converter

2019 ◽  
Vol 8 (1) ◽  
pp. 12
Author(s):  
Yuan Hu ◽  
Shaohui Yang ◽  
Hongzhou He ◽  
Hu Chen
Keyword(s):  
Numerical Analysis ◽  
Wave Energy ◽  
Wave Energy Converter ◽  
Hydrodynamic Performance ◽  
Theoretical Research ◽  
Width Ratio ◽  
Energy Converter ◽  
Wave Condition ◽  
Energy Capture ◽  
Central Platform

The influence of the central platform on hydrodynamic performance of a wave energy converter (WEC) has remained elusive. To approach this dearth of relevant theoretical research, this paper presents a semi-submerged multi-buoy WEC and the results of the numerical analysis at different dimension parameters of the central platform of the WEC. The WEC consists of three oscillating buoys hinged with a central platform through multiple actuating arms. Numerical analysis revealed that there exists a relationship between the hydrodynamic performance of device and the geometry of the central platform. At the given wave condition, different central platform size would obviously affect the hydrodynamic performance and wave energy capture width ratio of the semi-submerged multi-buoy WEC. Additionally, appropriately increasing central platform draft would help to improve the wave energy capture capability of the oscillating buoys.

Model Test of the Aker Wave Energy Converter Concept

2013 ◽  
Author(s):  
Svein Ersdal ◽  
Anders M. Moe
Keyword(s):  
Model Test ◽  
Wave Energy ◽  
Frequency Domain Analysis ◽  
Wave Energy Converter ◽  
Body Type ◽  
Energy Converter ◽  
Energy Capture ◽  
Wide Range ◽  
Different Characteristics ◽  
Rotational Response

The results from a model test of a wave energy converter of the articulated body type are presented and compared with the analytical results from a linear frequency domain analysis. The focus is on the rotational response of the arm connecting the bodies, since this is the motion used for energy extraction. Using a servo motor with programmable torque vs. angular velocity characteristics constant, linear and quadratic relationships could be modeled in the test. The comparison with the numerical model shows that the presence of walls in the test tank influences the response, thus some uncertainty in the results is found. Still, the capture width is found to be above 60% of the width of the device for the most common waves. For long and large waves the efficiency is very low, which means that the PTO system is not overloaded in storm conditions. Comparison of the response with different characteristics of the PTO show that a quadratic relation gives an effective energy capture over a wide range of sea states with no tuning of parameters.

scholarly journals Analysis of a Two-Body Floating Wave Energy Converter With Particular Focus on the Effects of Power Take Off and Mooring Systems on Energy Capture

2011 ◽  
Author(s):  
Made Jaya Muliawan ◽  
Zhen Gao ◽  
Torgeir Moan ◽  
Aurelien Babarit
Keyword(s):  
Wave Energy ◽  
The Body ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
Operational Conditions ◽  
Energy Capture ◽  
Irregular Wave ◽  
Actual Operation ◽  
Linear Damping ◽  
Multi Body

The present paper summarizes analyses of a two-body floating wave energy converter (WEC) including the mooring system. An axi-symmetric Wavebob type WEC is chosen as the object of investigation here. However, the PTO system is modeled in a simplified manner as ideal linear damping and spring terms that couples the body 1 and the body 2 motions. The analysis is done using SIMO, a time domain simulation tool which accommodates simulation of multi-body systems with hydrodynamic interactions. In SIMO, docking cone features have been introduced between the two bodies to let them move as per actual operation and fenders are applied to represent end stops. Six alternative mooring configurations are applied to investigate the effect of mooring on power capture. In this paper, the software HydroD using WAMIT for hydrodynamic is used to determine hydrodynamic loads. The analysis is carried out for several regular and irregular wave conditions as representative of operational conditions. Simulations are performed with the purpose to study the effects of power take off (PTO) system, end stops setting and several mooring configurations on power captured by the WEC.

Optimization of a Multi-pendulum Wave Energy Converter

2015 ◽  
Vol 9 (1) ◽  
pp. 67-73
Author(s):  
Jun Zhang ◽  
Chenglong Li ◽  
Hongzhou He ◽  
Xiaogang Zang
Keyword(s):  
Wave Energy ◽  
Structure Optimization ◽  
Energy Conversion Efficiency ◽  
Maximum Energy ◽  
Wave Energy Converter ◽  
Structure Parameters ◽  
Energy Converter ◽  
Energy Capture ◽  
Pendulum Wave Energy Converter ◽  
Pendulum Wave

In order to improve the energy capture efficiency of a multi-pendulum wave energy converter, a mathematical model of the pendulum structure has been built. The final structure parameters of the pendulum have been obtained by using genetic algorithm based on the numerical simulation results of the pendulum structure optimization. The results show that under obtained structure parameters the proposed multi-pendulum device can obtain maximum energy conversion efficiency.

Wave-to-Wire Simulation of Hydraulic Wave Energy Converter

2017 ◽  
Author(s):  
Rongyu Zha ◽  
Andrew Hillis ◽  
Jos Darling ◽  
Andrew Plummer
Keyword(s):  
Wave Energy ◽  
Synchronous Generator ◽  
Holistic Approach ◽  
Wave Energy Converter ◽  
Hydraulic Motor ◽  
Energy Converter ◽  
Energy Capture ◽  
Hydrostatic Transmission ◽  
Point Absorber ◽  
Transmission Stage

This paper introduces the simulation of a wave-to-wire (W2W) wave energy converter (WEC) design that includes the complete system from the original wave capture device to the final generated electricity supplied to the grid. Instead of designing the sub-systems separately, this holistic approach allows the optimization of the WEC performance. The Energy Capture Device (ECD), the absorption stage, is based on heaving theory, namely a point absorber. The Power Take-Off (PTO) system, the transmission stage, is based upon a hydrostatic transmission. Lastly the WIRE side, the generation stage, is achieved by connecting a three-phase round-rotor synchronous generator driven by the hydraulic motor from the PTO system. The control strategy primarily aims to meet the criteria of the grid while extracting as much energy from the waves as possible.

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