1. Field of the Invention
The present invention relates to a wind-power generation system and a control method for the same.
2. Description of Related Art
In recent years, when the grid frequency has become higher than the rated frequency, an output-power limiting operation for limiting the output power of wind turbines is sometimes performed irrespective of the wind speed to decrease the frequency. During the output-power limiting operation, the output power is reduced, and the rotational speed becomes higher than that in a normal operation. This causes overspeeding if a gust of wind occurs during the output-power limiting operation, thus increasing the possibility of disconnection.