| 摘要 |
The invention relates to a method for operating a wind energy installation (10), in which the wind energy installation (10) has a rotor (12, 13, 22), at least one rotor blade (14) with an adjustable angle, a mechanical brake device (19) for braking the rotor (14), an operational control device (15, 15') and a safety system (16, 20). The invention also relates to a corresponding wind energy installation (10). The method according to the invention is defined by the following method steps: braking of the rotor (12, 13, 22) by means of an angular adjustment (28) with an average angular adjustment rate of less than 8.5°/s of the at least one rotor blade (14) after a fault signal (30) occurs, braking of the rotor (12, 13, 22) by means of the mechanical brake device (19) as soon as the rotational speed of the rotor (12, 13, 22) exceeds a predefinable first rotational speed limit, and triggering of the safety system (16, 20) as soon as the rotational speed of the rotor (12, 13, 22) exceeds a predefinable second rotational speed limit, in which case the rotor (12, 13, 22) is braked, and the second rotational speed limit is higher than the first rotational speed limit while the second rotational speed limit is not exceeded when the wind energy installation (10) is operationally capable, even in the event of load shedding by the generator (23) combined with an extreme gust (31) of wind whose probability of occurrence is less than once in three months.
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