動揺する垂直軸風車の出力特性

抄録

In recent years, offshore floating type wind turbines that can be installed in waters where the water depth exceeds 50 meter have been paying attention. Almost all large wind turbines for power generation are horizontal axis wind turbine with wing nacelle (generator, gear) and tower, wings and nacelles occupying heavy weight among the three elements are on the top of tower therefore turbine having a top heavy structure. When considering that cost reduction of wind power generation is achieved by enlarging the wind turbine, then stability will become a problem in case of floating type. The wind turbine has a type in which the axis connected to a generator vertically is called a vertical axis type. The power generation efficiency is inferior to that of the horizontal axis type, but it does not require direction control, and it also features the ability to install heavy electric generators and gears at the bottom. In the case where the floating offshore wind turbine is enlarged in size, this feature is advantageous in terms of stability. This study aims to clarify the influence of wave and tidal current fluctuation when a vertical axis type wind turbine is used as a floating offshore wind turbine. In the case of a horizontal axis type wind turbine, it has already been reported that the output decreases as the wind turbine tilts. In the case of a vertical axis type windmill, we tried to clarify the effect of the wind turbine being tilted by the model experiments. The results shows output of tilted vertical axis wind turbine is little increase.