The application of TCP (Tidal Current Power) on the west and south coastal regions in Korea seems to be very suitable. There are many potential sites with high current speed up to 6.5m/s. Not like other renewable energy sources, TCP is very reliable and predictable and continuous energy as the tidal current pattern can be predicted throughout the year. One of the essential components in TCP device is the rotor that can convert the inflow current into the rotational energy. The design and optimization of rotor are very important to maximize the power production. The performance of rotor can be determined by various parameters including number of blades, shape, sectional size, hub, diameters and etc. The attack angle also affect significantly on the efficiency of the system. It is very important to maintain the 90 degree of attack angle to the rotor. In Korea, there are distinguishable flow direction changes from high and low tides. To cope with this environmental, a new device so called “Active vanning HAT (horizontal axis turbine) system” is introduced to accommodate the change of incoming flow direction. The experiment results and the performances of the device are introduced in the paper.

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