Shutdown control method, shutdown control device and wind generating set

Abstract

The invention relates to a shutdown control method, a shutdown control device and a wind generating set. The shutdown control method comprises the steps that shutdown information of the wind generating set is obtained; and at least one blade is controlled to rotate by a preset angle relative to the hub according to the shutdown information, so that the difference value of the absolute values of the pitch angles of at least two blades in the multiple blades reaches a preset threshold value range, and the value range of the lower limit value of the preset threshold value range is 2-5 degrees. According to the shutdown control method, the shutdown control device and the wind generating set provided by the embodiment of the invention, stall flutter of the wind generating set after shutdown can be effectively avoided when the yaw system of the wind generating set fails, and the power generation benefit of the wind generating set is ensured.

Description

technical field [0001] The invention relates to the technical field of wind power, in particular to a shutdown control method, a shutdown control device and a wind power generator set. Background technique [0002] When the wind turbine is shut down, when the wind speed is high and the yaw angle is too large, the impeller system of the wind turbine will stall and flutter, resulting in excessive load on the blade root, thereby destroying the structure. In order to avoid the occurrence of flutter when the wind turbine is shut down, the yaw system is usually required to track the wind direction when the wind turbine is shut down, and the yaw system is controlled according to the wind direction so that the nacelle drives the impeller system to move relative to the tower, so as to avoid the excessive wind angle of the yaw and prevent The occurrence of stall chatter. [0003] Although this method can prevent the occurrence of stall flutter to a certain extent, it also has corresp...

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Problems solved by technology

[0003] Although this method can prevent the occurrence of stall flutter to a certain extent, it also has corresponding risks, mainly manifested in that when the yaw system fails, such as power failure, the engine room cannot be controlled to drive the impeller to move relative to the tower according to the risk. Will make the impeller system also have the risk of stall flutter, affecting the safety of wind turbines

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