Method and device for controlling wind generating set to be shut down

Abstract

The embodiment of the invention provides a method and device for controlling a wind generating set to be shut down. The method comprises the steps of measuring pitch angles of blades of the wind generating set in real time in real time, and monitoring whether the wind generating set generates brake torque or not in real time; when the monitored wind generating set cannot generate the brake torque and the average pitch angle of the currently-measured pitch angles corresponding to the blades is smaller than the preset pitch angle threshold value, controlling the blades to be collected at the first blade collecting speed, and recording fist time of blade collection at the first blade collection speed; and when the first time exceeds the preset time threshold value, controlling the blades to be collected at the second blade collecting speed until the average pitch angle of the blades reaches the shutdown angle, wherein the first blade collection speed is larger than the second blade collection speed. According to the technical scheme, shutdown operation of the operating wind generating set can be achieved, and meanwhile the limit load of a tower of the wind generating set is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of wind power, in particular to a method and device for controlling the shutdown of a wind power generating set. Background technique [0002] When the wind turbine needs to be shut down during operation, and the generator can still provide braking torque during the shutdown process, the use of a constant pitch retraction rate will not cause excessive tower limit loads. However, when the wind turbine is shut down due to off-grid or other faults, and the generator cannot generate braking torque due to off-grid, if the unit encounters a large gust of wind at this time, still adopting the constant-speed propeller retraction shutdown method will cause the tower The limit load of the frame is increased. Contents of the invention [0003] The embodiment of the present invention provides a method and device for controlling the shutdown of a wind power generating set, which solves the problem that when the genera...

AI Technical Summary

Problems solved by technology

[0003] Embodiments of the present invention provide a method and device for controlling the shutdown of wind power generators, which solves the problem that when the generator cannot generate braking torque due to off-grid and encounters a large gust of wind, the shutdown mode of constant speed blade retraction will cause the tower The problem of increased ultimate load

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