Abstract
Power output fluctuation of 2 MW-wind turbine-generator systems, which apply fixed speed operation and variable speed operation, under wind speed fluctuation is analyzed by numerical simulation. The fixed speed operation has two levels of operating rotational speeds in response to the wind speed. The variable speed operation has two operating modes : constant tip speed ratio operation at low wind speeds and constant speed operation at high wind speeds. For any operation method, the pitch angle is controlled to maintain the rated electric power output. The simulation result carried out by using an observed field wind data shows that the variable speed operation can reduce the power output fluctuations with both long and short periods as compared with the fixed speed operation due to rotational inertia of the rotor. Furthermore, the influence of the pitch angle control at high wind speeds on the power output fluctuations is revealed.
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