成果報告書詳細
管理番号20140000000370
タイトル*平成25年度中間年報 風力自然エネルギー技術研究開発 海洋エネルギー技術研究開発 次世代海洋エネルギー発電技術研究開発(水中浮遊式海流発電)
公開日2014/7/1
報告書年度2013 - 2013
委託先名東京大学大学院新領域創成科学研究科 株式会社IHI 株式会社東芝  株式会社三井物産戦略研究所
プロジェクト番号P07015
部署名新エネルギー部
和文要約
英文要約Title: Research and Technical Developments on next generation Ocean Energy
Generator (Ocean Current Generator in the Sea (Subsea floating Type))

Interval Report for 2013 Fiscal Year (Out of 2011 FY - 2014 FY Program)

By: University of Tokyo, IHI Corporation, Toshiba Corporation, Mitsui Global Strategic Studies Institute

Contents and Results
(1) Development of a turbine
The output characteristics of the turbine have been carried out using a towing tank and CFD. We evaluated effect of the turbine blade deformation, the obliquely inflow of the turbine and the wake of the cross-beam which connects the twin-turbine.
Small scale mockups of the turbine blade, which have various combinations of structure and materials corresponding to the actual blade, have been manufactured in order to obtain characteristics of the stiffness and breaking mode for each combination. Water absorption tests under seawater and air pressure condition were carried out using turbine blade material to estimate their absorption characteristics.
We have also started subsea material test to investigate the marine bio-fouling and marine corrosion behavior for turbine blade, rotor and main body material.
(2) Development of a floating structure and mooring system
An experimental test model of floating body which equips twin turbines and control functions corresponding to the actual floating body has been manufactured. Suitable configuration of the mooring line, anchor/sinker and cable for electric transmission for the present floating type ocean current turbine system has been investigated with the estimation of drag and tension on this mooring system.
(3) Development of a generator and power transmission system
 A 100kW class generator has been designed to evaluate the electromagnetic characteristics of a direct-drive permanent magnet generator corresponding to the low rotating speed. The experimental apparatus to measure the characteristics of the seawater-lubricated plastic bearing under the actual bearing load condition has been developed.
 We also investigated the structure of substation equipment which are installed on the seabed as an intermediate substation.
(4) Development of the simulation technology
 A long term measurement of KUROSHIO off Miyake Island by ADCP has been carried out. A precise numerical simulation at TOKARA area by JCOPE-T has been done. A simulation code for estimating the twin type current turbine motion has been improved to simulate the startup and accidental scenario. Several types of power cable fixation have been evaluated by a commercial code. All numerical results have been validated by tank experiments.
(5) Preliminary Research on Methodology for evaluation of Generator and Feasibility
The marine construction apparatuses for offshore oil & gas industry are commercially available in large scale overseas. Recently economical equipment suitable for the ocean renewables are being put in practical use in European market. On the other hand, such commodities have not been developed in Japan.
 For this reason, we have carried out the investigation for necessary equipment and technology for construction and deployment of ocean current generator such as swivel, suction pile, drilling machine, mooring system and construction vessel available or under development in Europe. We have tried to identify the information suitable for water depth shallower than 200m and deeper. Based on such information, we have estimated preliminary cost for deployment of ocean current generator.
(6) Feasibility of the ocean current generator
 Technical challenges for core components have been estimated in the actual operation condition for the ocean current generator. It is confirmed that the present system can be realized over the life cycle of the system by achieving the components in this development.
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