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成果報告書詳細
管理番号20170000000445
タイトル*平成28年度中間年報 風力発電等技術研究開発 洋上風力発電等技術研究開発 次世代浮体式洋上風力発電システム実証研究(要素技術開発)
公開日2017/7/6
報告書年度2016 - 2016
委託先名国立大学法人九州大学 国立研究開発法人海上・港湾・航空技術研究所 日本アエロダイン株式会社 株式会社富士ピー・エス 株式会社グローカル
プロジェクト番号P14022
部署名新エネルギー部
和文要約
英文要約TITLE:
Wind Turbine Technologies Development
Offshore Wind Turbine Technologies Development
Next Generation Floating Offshore Wind Turbine Technologies Demonstration Research
(Element Technologies Development)

The problems related to the 6 MW nezzy floating offshore wind turbine concept, which is promising in lower COE, are studied in this project.
(1) 2-Bladed, Downwind Rotor
(2) Pre-stressed Concrete (PC) - Steel Hybrid Floater, Guy Wire Supported Inclined Tower
(3) Turret Mooring
The target is 20 JPY/kWh with 20 years of design live in 2030.

Multiple models floater models were defined. Stability analysis shows the system is stable up to 20 min-1 of rotor speed, which is far beyond the operation range.
The shape of the PC floater was modified from tapered to non-tapered, considering the advantages in cost reduction, exchanging several presents of mass penalty. Preliminary FEM analyses were conducted for typical configurations, and typical loads. They show deformation, stress, stabilities are safe enough.

Monitoring and tuning of the guy wire pretension were investigated as they strongly affect the dynamic behavior of the floater-tower structure. Load cell and accelerometer were selected as promising candidates for the monitoring. And the center pole jack was proposed as a feasible tuning method.
This concept is affected by marine growth stronger than other concepts, due to the yawing concept. Marine growth on ship were investigated for further studies.
4 procedures (1) New Dock, (2) New Semi-submersible Vessel, (3) Existing 2 Floating Cranes, (4) New 1 Floating Crane, were proposed as candidates. And plans (1) and (2) showed the lowest.
Trial manufacturing and test are conducted for floater PC parts and PC-Steel connection to establish the manufacturing and building techniques. General dimensions were determined for both models. Suspension points were investigated through FEM.

Macro parameters of mooring as absorption characteristics of energy and displacement are studied through the mooring test. General specifications of the tests were determined as 1:200 for the single point mooring test.
The model scale was determined as 1:30 considering design conditions and specification of the tank.
Test conditions and measurement apparatus were investigated for the elastic model tank test.

This concept allows non-symmetrical tower cross section. Airfoil-shaped tower section is promising for start-up and idling in a storm. The coupled analysis model was modified to enable to calculate the phenomena.
Airfoil-shaped tower cross section is expected for the characteristics, whereas, the cost will increase. Two promising controls were proposed to improve start-up characteristics as (1) rotor Motoring and (2) Parking in Vertical Position. The effects of these concepts will be investigated in succession.
Wind, marine, and lightning conditions were defined which cover most regions around Japan.

Cost information in Europe, which will be the base of the study, was collected.
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