20 ㎿급 부유식해상풍력시스템 적용을 위한 블레이드 공력 성능 해석

Abstract

Abstract The global energy problem is one of the main challenges that has to solved. Renewable energy technologies to achieve carbon neutrality in order to overcome global warming attracted worldwide a lot of interest, especially in the recent years. In order to reduce the dependency on fossil energy, it is required to switch to efficient power generation methods in renewable energies, such as solar power, wind power, wave power, biomass generation etc. IRENA estimates that it would be necessary to install at least 2,000 GW of offshore wind power to limit the global temperature rise to 1.5℃ and achieve carbon neutrality by 2050. Therefore, it can be expected that the market will continuously in future. First of all, offshore wind facilities do not place any burdens on the landscape if placed in distances of more than 12 nautical miles to the shore, and it is less burdensome to find a site for a very large capacity wind farm. Especially in water depth more than 60m, bottom-fixed offshore wind in water faces the problem that there are many maritime environment restrictions which makes it difficult to predict the schedule and the process to secure economic feasibility. On the other hand, in case of floating offshore wind it is possible to separate the floating offshore wind farm construction site and the floating offshore wind system production location, and it has also the advantage that possible to establish an industry market with a continuous mass-production. In contrast to China with its large territory and relatively shallow coast, and which is able to develop its offshore wind industry by concentrating on their domestic market, it seems that Korea faces bad conditions in the domestic market. The EU Carbon Border Adjustment Mechanism which will be introduced in 2025 and the REPowerEU plan presented on 18 May 2022 are moving accelerating the schedule of the EU Green Deal in all respects. Most export oriented industries in Korea are not showing much interest up to now and are not prepared to adapt quickly and proactively in the fast changing international environment. However, it is too early to draw final conclusions about success only on the background of these disadvantageous industrial background and the limited domestic market conditions because Korea is one of the world’s most competitive shipbuilding and offshore plant construction nations which has all necessary core competencies and a well-developed industry infrastructure. In case of developing large capacity floating offshore wind systems the LCOE will decline significantly, and if it is possible to sustain a continuous production the production systems will be transformed to continuous mass production. Therefore, there is the chance of winning competiveness to enter the market. The present study tries to analyze whether a floating offshore wind generation system can be expanded to a to 50 MW ultra-large capacity or more. In order to reach a conclusion of this study, the power coefficient was calculated and the total rated output was calculated based on the blade element momentum theory. The verification of results has been made by using the open source software Qblade. Just the same as marine diesel engine which has only a negligible portion of the total ship production. The engine itself is an important component but it will not lead the development of the whole ship building industry. Similarly, the study implies that the project should be led by the system providers using ship building methods of blade and floater construction by assembling mega blocks, instead of leading role of the wind turbine provider like the case of the Danish type wind turbines which normally consists of an upwind turbine with of three blades and one tower. In contrast to China which can rely their leading position due to the solid and large domestic market, there is the hope that Korea can lead the market entry in very large size floating offshore wind generation systems. Even being a market follower, it will be possible to enter the market with installation potential of the domestic market if the development is based on large capacity floating offshore wind generation systems.