成果報告書詳細
管理番号20150000000251
タイトル*平成26年度中間年報 風力等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 (油圧式潮流発電)
公開日2015/10/2
報告書年度2014 - 2014
委託先名国立大学法人東京大学 国立大学法人九州大学 佐世保重工業株式会社
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: Wind and Other Renewable Energy Technology Development/Marine Renewable Energy Development/Next Generation Technology Development:Hydraulic Tidal Energy Convertor (FY2012-FY2015) FY2004 Annual Report
1. Overall system proposal and rotor development: Tokyo University
Assuming installation of the tidal energy convertor at the Kobe Channel in the Goto-Islands, we developed a skeleton diagram of grid connection with an overhead power transmission line. We investigated steel structures for the tidal energy convertor taking into account marine transport safety and cost effective installation by a crane barge.
To investigate rotor materials for controlling biofouling, we have started a long-term field test of specimens in seawater. Silicon based paints have been found to be effective for controlling biofouling. To investigate damage to rotors due to cavitation, we investigated the characteristic of cavitation occurrence using model rotors with 22cm-diameter in the Cavitation Tunnel Experimental Facility.
To verify waterproof performance, we conducted model experiments of the nacelle model with 2.2m-diameter rotors using the large wave tank (10m width, 50m length and 5m depth). After troubleshooting and implementing measures to prevent water leakage through the shaft bearing, we will conduct a new field test using a towing vessel in the next FY2015.
2. Tidal Current/Bottom Topography Investigation and Simulation: Kyushu University
At Kobe Channel in the Goto Islands, several field measurements were conducted such as depth, bottom topography, tidal currents and waves. Results showed that the bottom topography was almost flat and the depth was approximately 16m. It was found that the maximum current speed was 2.4 m/s and the significant wave height was less than 40 cm by the field observation from 3 September to 29 October 2014.
We conducted tidal current simulations over the whole sea area around the Kyushu Island using the MPI parallel code developed in FY2013 and the maximum mesh size was 10km and the minimum was approximately 100m. Using the results, we can know the tidal current speed at any point and can compere the tidal energy potential around the Kyushu Island.
3. Bench test of hydraulic tidal energy convertor: Sasebo Heavy Industries Co. Ltd.,(SSK)
We manufactured nacelle models with rotors of 2.2m-diameter and attachment devices for the trolley in the large experimental tank through collaboration with Tokyo University.
To improve energy conversion efficiency of the prototype of 110kW tidal energy convertor, we modified oil lines and applied a high-pressure type of oil heat exchanger. The maximum energy conversion efficiency was measured by the full-scale bench test of the modified prototype taking the system usage of electricity into account. We developed an electronic control method to obtain maximum output from tidal energy and applied a cut-out algorithm to avoid over speed of the generator.
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