Crossing method and device for overspeed failure of wind generating set

Abstract

The invention provides a crossing method and device for an overspeed failure of a wind generating set. The method comprises the following steps: acquiring the current wind regime data; judging whetherthe current wind regime is overproof gust or not according the current wind regime data; if not, judging whether the current rotating speed of the wind generating set is greater than or equal to a preset crossing rotating speed or not and judging whether the current variable pitch rate of the wind generating set is greater than or equal to a preset crossing variable pitch rate or not; if the current rotating speed is greater than or equal to the preset crossing rotating speed and the current variable pitch rate is greater than or equal to the preset crossing variable pitch rate, increasing the cut-out rotating speed within a second preset time period and controlling the wind generating set to carry out a variable pitch operation continuously; reducing the cut-out rotating speed in a second preset time period, and judging whether the current rotating speed of the wind generating set is greater than or equal to the cut-out rotating speed or not; and if the current rotating speed of thewind generating set is smaller than the cut-out rotating speed, controlling the wind generating set to operate according to the current state.

Description

Technical field [0001] The embodiment of the present invention relates to the technical field of wind power generation, and in particular to a method and device for crossing over-speed faults of a wind generator set. Background technique [0002] In recent years, wind power generation has been widely used due to its environmental protection advantages. Wind turbines need to control their operating status according to different environments. As a key component of the wind turbine generator, the generator needs to control the speed to prevent the bad working conditions of the speed out of control. [0003] When the speed of the wind generator set reaches or exceeds the cut-out speed of the wind generator set, it is considered that the wind generator set has an overspeed fault. In the prior art control method for the wind generator set, once the overspeed fault is triggered, it needs to be executed immediately Failure to stop. [0004] However, many wind turbines are affected by fact...

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a ride-through method and device for overspeed faults of wind power generators. This method solves the problem of starting and stopping immediately after the overspeed fault is triggered in the control method of wind power generators in the prior art. The number of times increases, which increases the fatigue load generated during the start-up and shutdown of the wind turbine, and also reduces the power generation of the wind turbine and the technical problem of the mean time between failures.

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