This report provides the survey result of the wake flow, which was caused by a floating offshore wind turbine model in the wind tunnel test. A compact wind turbine model that can be operated three blades independently was newly designed for the test. The model was placed in the wind tunnel, and a uniform flow or a shear flow were used. In addition, the entire model was oscillated pitch direction that assumed floater motion in waves. Wind speed of mainstream direction was measured by hot wire anemometers to obtain the differences in the effect of turbine pitch oscillation and blade pitch control on the wake flow. As a result of the test, it was confirmed that the influence of the pitch oscillation and the blade pitch control was slightly observed in wake flow, and it was decay rapidly.

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This paper quantitatively discusses the limitations of connecting a large amount of renewable energy power sources to the power system. The current power supply system is basically composed of a rotary synchronous generator, and its synchronization characteristics and extremely large transient overload capability support the stability of the power system. On the other hand, since solar power generation, wind power generation, and the like are connected to an electric power system via an inverter（they are referred to as renewable energy power sources）. A major feature of this renewable energy power supply is that it does not have an overload capability. This paper discusses the constraints when connecting a large amount of such renewable energy power sources to the power system from the macro stability of the power system when the load suddenly changes. As a conclusion, it was found that a large amount of renewable energy power supplies can be introduced even in large industrial areas where a large amount of induction motor load exists.

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A new type of two bladed horizontal axis wind turbine which is driven by angular momentum generated in the bent wind flow passing on the blade surface is studied experimentally in order to understand its potentiality. From this study, we found that the turbine was able to work as a useful convertor of wind flow into rotary motion if a device called as flow conductor is attached to the turbine blade. This flow conductor is briefly described in this report.

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