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The Development and Testing of a Submerged Tidal Current Power Generator
tidal current power generator
passive inflow direction-finding turbine
|Issue Date: ||2017-01-04T06:18:00Z
|Abstract: ||本研究主要目的是自行設計研發一組3 kW全沒水式的潮流發電機，並於大型空蝕水槽進行測試後再安裝海中實測。本機組的葉輪乃是應用螺槳升力線理論設計。本研究設計二組葉輪，其設計流速分別為3.0 m/s與2.3 m/s，而直徑分別為0.8 m與1.22 m。另由於葉輪轉速低，為了降低發電機之轉矩與尺寸，於發電機之前分別裝設一7或10倍的加速行星齒輪，另外我們也設計一特殊水密機構使該機構能夠隨潮流轉向，使其葉輪永遠對準入流以達最高發電效率的狀況。本機組於大型空蝕水槽經過10個多月測試與改善，完成水密、電壓、電力系統與轉向機構測試。機組使用0.8 m直徑葉輪的水槽測試結果顯示流速若達3.0 m/s，實際發電功率約為1,500 W，而依葉輪設計結果於3.0 m/s流速可達3 kW，全部損失為50%，若使用直徑1.22 m葉輪，其於水槽以及海中實測的結果相近。
Abstract: A 3-kW fully submerged tidal current power generator has been developed and tested in the large cavitation tunnel at National Taiwan Ocean University and on the Keelung Sill. The turbine blades were designed by using propeller lifting line theory based on 3.0 m/s and 2.3 m/s inflow velocity for 0.8 m and 1.22 m diameter, respectively. Due to the low rotation rate of the turbine blade, a planet gear box was used to increase the rotation speed and to reduce the size of generator. For this, the water tightness mechanism was also designed to protect the gear and the generator. Moreover, tail fins were designed and mounted on the tidal current unit, so that the turbine blades can always face towards the incoming tidal current. An electronic rectifier was used to convert the output power to the 220 V voltage and a 60 Hz frequency. After ten months of testing in the laboratory tunnel, it was found that the tidal unit produced an output of 1,500 W at 3.0 m/s flow velocity for the 0.8 m diameter turbine. For this system, the efficiency of the permanent magnet generator is 0.85 and power converter is 0.91, and the mechanical loss is about 35%, which includes the loss by the shaft, seals and the gear box. Since the 0.8 m turbine is designed to generate 3,000 W of power, the overall loss of the system is 50%. For the case of 1.22 m diameter, the results of sea trail were almost the same as at those found in the tunnel tests, after the tunnel blockage effects were included.
|Appears in Collections:||[海洋環境資訊系] 期刊論文|
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