Method and equipment for ensuring safe clearance of wind driven generator

Abstract

The invention provides a method and equipment for ensuring safe clearance of a wind driven generator, which comprises the following steps of: firstly, introducing gust identification into an algorithm for changing the pitch of a unit in advance, adding an additional angle to a theoretical minimum pitch angle of the unit to serve as a minimum set pitch angle of the unit when gust in a certain time period is detected, and keeping for a certain period; therefore, it is ensured that the unit tower clearance keeps a certain safety margin, and the unit operation performance is improved; and secondly, the gust is accurately recognized, the pitch angle of the unit is increased according to a certain control algorithm, and the limit load of the unit under the gust working condition can be reduced. The video monitoring equipment is installed on the tower, the distance between the blade tip of the unit and the tower wall is captured in real time, when it is detected that the distance is smaller than a certain preset threshold value, the pitch can be changed in advance, and the tower clearance is increased by lifting the pitch angle of the unit.

Description

technical field [0001] The invention belongs to the technical field of wind power generators, in particular to a method for ensuring safe clearance of wind power generators. Background technique [0002] Modern wind turbines are a large inertia nonlinear system. In recent years, whether it is an offshore wind turbine or an onshore unit, the capacity of a single unit has become larger and higher, and the tower has become higher and higher. There is a large difference in wind speed above and below the impeller. Generally speaking, the wind speed increases with the increase of height, and different wind speeds have different thrusts on the impeller surface. Due to the unbalanced distribution of thrust on the impeller plane, there is a certain degree of imbalance in the impeller: for wind turbines , the wind speed above the impeller is greater than the wind speed below the impeller (wind shear is positive), resulting in uneven stress on the entire impeller plane. The thrust on...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to solve the problem that the tower headroom is too low under certain working conditions of the unit, and to improve the safety margin of the unit operation; The pitch angle of the unit helps reduce the ultimate load of the unit under gust conditions

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