The General Design Of Floating Tidal Current Power Station

Tidal energy is a kind of clean renewable resources with high value. Tidal energy will play an important role in the 21th century. Therefore, the exploitation and utilization of tidal power will be the focus of China, even all the world. There are a long coastline and rich tidal resources in China, the exploitation and utilization of tidal power has become the primary task.Presently, tidal current power stations have three forms, which are the floating stations, the pillar supported and seabed stations. The installed power stations in China include the floating stations and seabed stations. The main works in this thesis is the general design of a 150kW floating tidal current power station, which is supported by The National Key Technology Research and Development program.The contents of this thesis are presented as following:Firstly, the form of the tidal current power station is determined. Secondly the stability and hydrodynamic performance are calculated. Then the turbines'loads are computed. Last, the station's structure strength is checked.The station's form is selected by comparing the index of economy, the turbines' efficiency and stability. The comparison of three type power station is implemented, and the form of catamaran is chosen finally. Then initial stability and stability at large angle of inclination of catamaran is analyzed. According to the 3-D potential flow theory in the frequency domain, added mass and damping, first-order forces and moments, second-order draft forces and first-order motions of catamaran are calculated by HydroStar software. The results are analyzed and some advices are given. The computation of the turbines'loads plays an important role in structure strength analysis of catamaran. The turbines'loads and moments are calculated, which is based on momentum theory and stream tube method. Then the wave loads are calculated in terms of criterions. Finally Patran software, which is the FEM simulation software, is used to analyze the structure strength, and conclusion is generated. The study shows that the tidal current power station satisfies 150 kW turbines' requirement, and the structure strength satisfies the requirements of China Classfication Society. The research works in this thesis will provide reference for design of the same type tidal current power station in future.