Fukushima Floating Offshore Wind FarmDemonstration Project（ Fukushima FORWARD ）- Construction of Phase I -Fukushima Floating Offshore Wind Farm Demonstration Project2MW Downwind-type Floating Wind Turbine “Fukushima Mirai”
Fukushima
offshorewind
consortium is proceeding with
Fukushima floating offshore windfarmdemonstration
project(Fukushima FORWARD) fundedby the Ministry of Economy, Tradeand Industry.
In this project, three floating
wind turbines and one floating
power sub-station have been
installed off the coast of Fukushima. The first phase of theproject consists of one 2MW
floating wind turbine, the world first
25MVA floating substation andsubmarine cable, and have been
completed in 2013. In the second
phase two world largest 7MW windF kushima
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66kV Floating Substation “Fukushima Kizuna”
turbines will be installed before
2015.
This project will establish thebusiness-model of the floating
wind farm and contribute to futurecommercial projects. The consortium members are also expected
to learn know-how of floating
offshore wind farm, which will beone of the major export industries
in Japan.
The Fukushima FORWARD
project believes to help Fukushima
to become the center of new industry which will create new employment in this region to recover fromthe damage of the Great East
Japan Earthquake in 2011.

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Water tank test
By using a scaled model of 2MW compact semi-submersible floater, water tank test was carried to clarify theresponse of the floater under design wind, wave and current conditions on April, 2013. The optimum control
method during power production for floating wind turbine was also investigated. A dynamic analysis model ofFOWT is validated by comparing with the water tank test and onsite mesurement data.

Water Tank Test at National Marine Reserch Institute

Metocean measurements
The floating substation is equipped with met-ocean measurement devices. Wind velocities are measured byusing cup anemometers, wind vanes and sonic anemometers on the met mast, and the doppler lidar on themain deck. The wave and current are measured by using the wave meter and ADCP on the middle hull. Thefloater motion is also measured with accelerometers, GPS and gyros on the main deck, and a floater motion
compensation algorithm is also developed.

Met-mast on the Substation

Wind Vane and Cup Anemometer

Meteorogical Observation Instrument

Thermo-hygrograph

Doppler Lidar

Current meter

Wave Meter
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Compact semi-sub floater for 2MW downwind turbine
The construction of compact semi-sub floater for 2MW downwind turbine was completed in May 2013. Thisfloater consists of one center column, three side columns, three braces, the main deck beams and the pontoon
beams which support the wind turbine. The compact semi-sub floater has advantages for construction andinstallation due to its shallow drought. The drought of the floater can be controlled by using the ballast tanklocated at the bottom of the side columns.

Deck Beams

Full View of Compact Semi-sub

Footing Ballast and Pontoon Beams

Installation of 2MW downwind turbine
The 2MW downwind offshore wind turbine was installed on the compact semi-sub floater in June, 2013. At
first the three sectioned 48.5m tower and the nacelle were assembled and then 39m blades were installed.
After receipt of commissioning test at Onahama, the 2MW downwind offshore wind turbine on the semi-sub
floater was towed to the site and began to generate power in November.

Installation of Blade

Lifting of Blade

Installation of Tower

Installation of Nacel
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Advanced spar floater for substation
The construction of the floating substations on the advanced spar floater was completed in June, 2013. On
the main deck of the upper hull, a met mast and heliport are installed. Inside the upper hull, the world first
floating substation is equipped. The bottom hull is filled with concrete to lower the center of gravity, whichenabled the construction and towing in vertical position. The floater motion by waves is reduced by the uniquehull shape with cob, middle hull and lower hull.

Heriport

Upper Part of Substation( Upper Hull, Cob, Midle Hull )Roof of Transformer Station and Foundation of Tower

Floating grid integration system
An offshore floating transformer system which is both durable and unsusceptible to floater motion isdeveloped and the performance against vibration and inclination was evaluated through shaking table tests.
Furthermore, a large capacity water proof riser cable superior to fatigue is developed and optimized by motion
analysis. Based on these technology, the world first floating offshore transformer system was establishedagainst severe metocean conditions.

Transformer on Floater
Section of Submarine Cable

Inclination Test

Vibration Test

Tension Test for Rizer Cable
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Installation of the compact semi-sub and advanced spar
The compact semi-sub floater with 2MW downwind turbine left Chiba dock of Mitsui Engineering &Shipbuidling on 27th of June, 2013. After testing at Onahama Port, it was towed to the site and installed. On
11th of June, 2013, the advanced spar floater for floating substation left Isogo dock of JMU and towed to theinstallation site directly. From the 16th of June, 2013, the anchoring for the substation began and finished inOctober.

Towing of Compact Semi-subLeaving Dock of Compact Semi-sub

Towing of Substation

Installation of anchor, chain and submarine cable
In May, 2013, the anchor and mooring chain for both compact semi-sub and substation floaters wereinstalled. In June, at the coast of Hirono, where onshore substation is located, the installation of the submarine
cable began by the cable layer ship. The grid connection of the floating offshore wind turbine and substation
was completed on 31st of October.

Submarine Cable on the Cable Layer Ship

Installation of Mooring ChainAnchor on the Deck

Installation of Submarine Cable
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Fukushima Offshore Wind Consortium
Marubeni Corporation
1-4-2 Otemachi, Chiyada-ku, Tokyo 100-8088

The University of Tokyo
7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656

Mitsubishi Corporation
2-3-1 Marunouchi, Chiyoda-ku, Tokyo 100-8086

Mitsubishi Heavy Industries, Ltd.
2-16-5 Konan, Minato-ku, Tokyo 108-8215

Japan Marine United Corporation
5-36-7 Shiba, Minato-ku, Tokyo 108-0014

Mitsui Engineering & Shipbuilding Co., Ltd.
5-6-4 Tsukiji Chuo-ku, Tokyo 104-8439

Nippon Steel & Sumitomo Metal Corporation
2-6-1 Marunouchi, Chiyoda-ku,Tokyo 100-8071

Hitachi, Ltd.
1-6-6 Marunouchi, Chiyoda-ku, Tokyo 100-8280

Furukawa Electric Co., Ltd.
2-2-3 Marunouchi, Chiyoda-ku, Tokyo 100-8322

Shimizu Corporation
2-16-1 Kyobashi, Chuo-ku, Tokyo 104-8370

Mizuho Information & Research institute, Inc.
2-3 Kandanishikicho, Chiyoda-ku, Tokyo 101-8443

Contacts:
The University of Tokyo
Department of Civil Engineering
School of Engineering
Prof. Dr. Takeshi Ishihara
Manager Shigeru Taki
2-11-16 Yayoi Bunkyo Tokyo 113-8656 Japan
Tel +81-3-5841-6145 fax +81-3-5841-0609