1. Durability Testing of Nacelle for 5.2-MW Wind Turbine Generator
Wind power is both a promising and a realistic source of renewable energy. Hitachi has developed a wind turbine generator system with a rated output of 5.2 MW. The first unit was built in 2015 and the second installed as floating wind turbine generation system off the coast of Fukushima in 2016. While the rated output of wind turbine generator systems continues to increase as their deployment expands from land to sea, the increased risk of accident or fault means that ensuring reliability is essential.
Accordingly, Hitachi manufactured a test version of the nacelle for the 5.2-MW wind turbine generator and conducted durability testing to verify its reliability of the main wind turbine components. The testing was conducted over a period of about six months at the National Renewable Energy Center (CENER: Centro Nacional de Energías Renovables) in the region of Navarra in the Kingdom of Spain. The nacelle was subjected to a variety of test loads that were equivalent to a 20-year fatigue load. The testing found that the propagation of load to key structural components agreed with the results of preliminary and dynamic analyses, and that the durability of the nacelle was adequate.
Hitachi intends to utilize the test data as feedback for the design of its production models so that they will be better equipped to serve as more reliable wind turbine generation systems.