Dynamic Response of a Combined Mono-Pile Wind Turbine and Heave-Type Wave Energy Converter System

2017 ◽  
Author(s):  
Nianxin Ren ◽  
Ying Zhu ◽  
Zhe Ma ◽  
Wei Li
Keyword(s):  
Wind Turbine ◽  
Wave Energy ◽  
Wave Energy Converter ◽  
Wave Loads ◽  
Energy Converter ◽  
Type Wave ◽  
Loads Analysis ◽  
The Time Domain ◽  
Novel Concept ◽  
Multi Body

In present work, a novel concept by combing a monopile wind turbine and a heave-type wave energy converter has been proposed, that is referred as the ‘MWWC’ (Mono-WT-WEC Combination) system herein. Concept feasibility study has been carried out by doing coupled aerodynamic and hydrodynamic numerical simulation in the time domain. Aerodynamic loads and output wind power of the NREL 5MW wind turbine are determined by the NREL Aerodyn code, based on BEM method. Hydrodynamic loads of the mono-pile and the WEC are calculated by the AQWA code, which is available for modeling multi-body systems including both mechanical and hydrodynamic couplings between the mono-pile and the WEC. Firstly, the effect of different power-take-off (PTO) parameters and wave periods on the performance of the WEC’s wave energy production under typical wave cases has been investigate, and a preliminary optimal value for the PTO’s damping stiffness has been proposed; secondly, the dynamic characteristic of the MWWC system has been investigate using coupled wind-wave loads analysis under typical operational sea cases. Finally, the extreme responses of the MWWC system have been obtained for its ULS design, and the potential challenging areas of the MWWC system has been highlighted.

scholarly journals Power Performance of the Combined Monopile Wind Turbine and Floating Buoy with Heave-type Wave Energy Converter

2019 ◽  
Vol 26 (3) ◽  
pp. 107-114
Author(s):  
Esmaeil Homayoun ◽  
Hassan Ghassemi ◽  
Hamidreza Ghafari
Keyword(s):  
Wind Turbine ◽  
Wave Energy ◽  
Wave Energy Converter ◽  
Dynamic Responses ◽  
Sea Waves ◽  
Power Performance ◽  
Regular Waves ◽  
Energy Converter ◽  
Damping Force ◽  
Type Wave

Abstract This study deals with a new concept of near-shore combined renewable energy system which integrates a monopile wind turbine and a floating buoy with heave-type wave energy converter( WEC). Wave energy is absorbed by power-take-off (PTO) systems. Four different shapes of buoy model are selected for this study. Power performance in regular waves is calculated by using boundary element method in ANSYS-AQWA software in both time and frequency domains. This software is based on three-dimensional radiation/diffraction theory and Morison’s equation using mixture of panels and Morison elements for determining hydrodynamic loads. For validation of the approach the numerical results of the main dynamic responses of WEC in regular wave are compared with the available experimental data. The effects of the heaving buoy geometry on the main dynamic responses such as added mass, damping coefficient, heave motion, PTO damping force and mean power of various model shapes of WEC in regular waves with different periods, are compared and discussed. Comparison of the results showed that using WECs with a curvature inward in the bottom would absorb more energy from sea waves.

STC (Spar-Torus Combination): A Combined Spar-Type Floating Wind Turbine and Large Point Absorber Floating Wave Energy Converter — Promising and Challenging

2012 ◽  
Author(s):  
Made Jaya Muliawan ◽  
Madjid Karimirad ◽  
Torgeir Moan ◽  
Zhen Gao
Keyword(s):  
Wind Turbine ◽  
Wave Energy ◽  
Capital Investment ◽  
Technical Information ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
Point Absorber ◽  
Floating Wind Turbine ◽  
Readiness Level ◽  
Novel Concept

This paper deals with a novel concept by combining a spar-type floating wind turbine (FWT) and a Torus (donutshaped) point absorber-type wave energy converter (WEC) that is referred as the ‘Spar-Torus Combination’ (STC) herein. Concept feasibility study has been carried out by doing numerical simulations. It showed that the STC results in a positive synergy between wind and wave energy generation in terms of both capital investment and power production. As a novel concept, the STC concept is considered a simple compact combination of two technologies that have had high technology readiness level (TRL). It is suitable for deep water deployment and is not sensitive to seabed conditions and wave directions. Therefore, it is interesting to pursue a further development of this concept. The paper presents the technical information about the STC and highlights some challenging areas of the STC that should be carefully looked at to make it a proven concept.

Comparative Study of Hydrodynamic Responses of Two Combined Wind Turbine and Wave Energy Converter Systems Under Typical Operational Sea Cases

2018 ◽  
Author(s):  
Nianxin Ren ◽  
Ying Zhu ◽  
Zhe Ma ◽  
Hongbo Wu
Keyword(s):  
Comparative Study ◽  
Wind Turbine ◽  
Contact Force ◽  
Wave Energy ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
Extreme Loads ◽  
New Strategy ◽  
Floating System ◽  
The Time Domain

In present work, two combined wind turbine (WT) and wave energy converter (WEC) systems have been concerned. One is a fixed-bottom system, referred as “MWWC” (monopile-WT-WEC combination); the other is a floating system, referred as “TWWC” (TLP-WT-WEC-combination). Comparative study of the hydrodynamic responses of the two combined systems has been done by numerical simulations in the time domain. Hydrodynamic loads of the supporting structures and the WEC are calculated by the AQWA code, which is available for modeling multi-body systems including both mechanical and hydrodynamic couplings between the supporting tower and the WEC floater. Firstly, the effect of different power-take-off (PTO) parameters, wave periods and the displacements of the WEC on the performance of the WEC’s wave energy production of the two combined systems under typical wave cases has been investigate, and preliminary optimal values for the PTO damping stiffness of the two combined systems have been obtained and compared; secondly, the effect of the horizontal contact force between the supporting tower and the additional WEC floater of the two combined systems have been further investigated, which is important for both the fatigue and extreme loads design of the supporting tower. Finally, a new strategy for MWWC system by adding horizontal PTO dampers between the supporting tower and the WEC floater has been proposed and investigated, which is helpful for both reducing the horizontal contact force and using the relative horizontal motion to produce power.

A Study on Development of the Performance Analysis Method of the Floating OWC-WEC Using the MPS Method

2015 ◽  
Author(s):  
Yutaro Sasahara ◽  
Mitsuhiro Masuda ◽  
Kiyokazu Minami
Keyword(s):  
Wave Energy ◽  
Two Phase Flow ◽  
Wave Energy Converter ◽  
Response Analysis ◽  
Phase Flow ◽  
Energy Converter ◽  
Wave Impact ◽  
Two Phase ◽  
Mps Method ◽  
Type Wave

When concrete examination towards utilization is needed, it is necessary to estimate the safety and the performance of a floating Oscillation Water Column (OWC)-type wave energy converter under abnormal oceanographic phenomenon such as large waves, wave impact force, deck wetness and complex motion of mooring system. Therefore, to choose a proper numerical method is important. This present paper describes a fundamental study about estimation of safety and performance of floating OWC-type wave energy converter using the two-phase flow MPS method. In this research, firstly, new algorithm is installed in order to solve problems of the two-phase flow MPS method. Secondly, applicability to an response analysis of a wharf installation type OWC-WEC of the improved MPS method is examined by wave pressure acting to the OWC-WEC and response in the air chamber of the OWC-WEC.

DESIGN AND CONTROL OF A 50KW CLASS ROTATING BODY TYPE WAVE ENERGY CONVERTER

2011 ◽  
pp. 1216-1223
Author(s):  
BYUNG-HAK CHO ◽  
SHIN-YEOL PARK ◽  
DONG-SOON YANG ◽  
KYUNG-SHIK CHOI ◽  
BYUNG-CHUL PARK
Keyword(s):  
Wave Energy ◽  
Wave Energy Converter ◽  
Body Type ◽  
Energy Converter ◽  
Type Wave ◽  
Rotating Body ◽  
And Control

A Serpent-Type Wave Energy Converter

2021 ◽  
Author(s):  
Sebastian Konrad Sorek ◽  
Wojciech Florian Sulisz
Keyword(s):  
Wave Energy ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
Type Wave
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