Design And Research Of The Turbine And Mooring System Of Floating Station For Marine Current Energy Generation

As the economy of our country develops in the high speed in decades, it needs more energy and has to import more oil and natural gas. To assure the safety of energy support and optimize the energy support, the utilization of renewable resource should be promoted and the development of renewable energy industry should be accelerated. It is also significant to the economy progress of the country. As it is a part of the renewable ocean energy, exploitation of current energy is now a hot issue. One of the high-efficient ways to utilize the current energy is to transform the current energy into electricity by the current power station.The Research and Demonstration of Key Technology for the150kW Tidal Current Power Station designed by Harbin Engineering University, which is supported by the National Key Technology R&D Program, will be the biggest current power station in home once it is established. As the turbine is the key part which determines the efficiency and reliability of the power station, it should be designed properly. In the whole life of the power station, it will suffer the loads of wind, wave and current, even the extreme situation of typhoon. So the mooring system should be reliable enough to keep the station running normally in the operation situation and survive in the extreme situation. A high efficiency turbine and a mooring system with high reliability are contrived in this paper for the floating tidal current power station.Firstly, the turbine is designed and the strength analysis is done for the risk position. The responses of the station in regular waves are calculated according to the 2-D and 3-D potential theory separately, and the wave load on the station is also computed in the thesis. The static and dynamic analysis method for the mooring system is explained, and the application of MOSES in offshore engineering is introduced later. Then three blue prints of mooring system are devised in the consideration of design requirements and environment situations. Each is analyzed in time domain by the software of MOSES, and the results are compared to get the optimized one. At last, to guarantee the reliability, a fatigue analysis is implemented of the chosen mooring system in use of the Miner fatigue cumulative damage rule.