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byK. Takagi, The University of Tokyo
Fukushima Floating Wind Turbine (METI): $280M
Offshore Wind Turbine Technology Development and Demonstration (Cabinet, METI, MLIT,MOE): $141M
Marine Energy Technology Development and Demonstration (METI, MEXT) : $25M
NEDO Project
Addressing energy and global environmental problems
Enhancement of Japan's industrial competitiveness
What is NEDO (New Energy and Industrial Technology Development Organization)?
http://www.nedo.go.jp/english/introducing_index.html
Type DeveloperWave Mitsui Engineering &
ShipbuildingWave MHI Bridge & Steel Structures
EngineeringTOA
Wave GyrodynamicsHitachi Zosen
Wave Ichikawa DobokuKyoritsu ElectricIdea Consultants
Tidal Kawasaki Heavy IndustriesWind &Tidal
MODEC
Type DeveloperOcean Current
The University of TokyoIHIToshibaMitsui GSSI
OTEC KOBELCOSaga University
Tidal Sasebo Heavy IndustriesThe University of TokyoKyusyu University
Tidal Nakashima PropellerPenta-Ocean ConstructionHiroshima Institute of Technology
Demonstration Projects Technology Development
2008-2010Surface floating UT: Yamaguchi, Suzuki, WasedaNMRI Supported by MLIT
2009-2010Floating contra-rotatingUT: TakagiSupported by NEDO
Vertical Load Anchor
Mooring Line Current
2010-2012 Floating contra-rotating UT: Takagi, KinoshitaSupported by JSPS(MEXT)
2013 TECO Green Tech ContestInternational ChampionNew Design Concept of Ocean Current Power Generation System
2011-2015Floating Twin-TurbineUT: Takagi, WasedaIHI, Toshiba, Mitsui GSSISupported by NEDO
Ocean current is one of big energy resources.
Total demand of electricity in Japan is 100GW.
Current is converged at several areas. Current axis is stable.
It is reasonable to assume that the rated speed is 1.5m/s at these areas
Diameter is big. Turbine gets big thrust force and torque
moment. Torque moment must be canceled out Water depth is deep. Floating type could minimize its weight Floating type is easy to install.
Floating type has an advantageTwin-turbine for torque moment
Rated speed Rated power Turbine diameter1.5m/s 2MW about 40m
The direct drive power train, where the turbine and the generator are connected directly, is proposed
Electromagnetic velocity meters
Buoy system for ADCP measurement
6DOF Main Body + Two Turbines + Two mooring lines (Fully coupled)
Wave radiation and diffraction +cross flow drag for the main body
Wing element theory for the lift and drag forces
Lumped mass method for mooring line
Z Towing Carriage
Mooring Line
Strut
5.1m
3.0m 5.0m
30°
CameraX
Model
Spring
0
20
40
60
80
100
120
140
160
180
0 500 1000
kN
Arclength (m)
Max Effective Tension
Free CatenarySingle Point MooringFloater InstalledMulti Points Fixed
‐0.005
0
0.005
0.01
0.015
0.02
0.025
0.03
0.035
0 200 400 600 800 1000
rad/m
Arclength (m)
Max Curvature
Free Catenary
Single Point Fixed
Floater Installed
Multi Points Fixed
Ocean current is one of big renewable energy resources not only for Japan but also for Taiwan.
We can realize this new idea in near future, although there are many elemental technologies which we need to develop.
This work is supported byNew Energy and Industrial Technology Development
Organization (NEDO) I am grateful for their support.
Thank you for your attention.
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