A variable speed feathering stop method, device and wind turbine

Abstract

The invention provides a variable-speed feathering shutdown method and device and a wind turbine generator set, and relates to the technical field of wind turbine generator set feathering shutdown. The wind turbine generator set comprises a generator and a cabin, wherein the generator is installed in the cabin. The method comprises the steps that the shutdown feathering speed of the wind turbine generator set is changed from an initial first shutdown feathering speed to a second shutdown feathering speed according to the rotating speed of the generator and the acceleration of the cabin, wherein the first shutdown feathering speed is determined by the pitch angle at the initial moment of the wind turbine generator set, and the second shutdown feathering speed is determined by the pitch angle at the current moment of the wind turbine generator set; the shutdown feathering speed of the wind turbine generator set is changed from the second shutdown feathering speed to a third shutdown feathering speed according to the rotating speed and power of the generator, and feathering and shutdown are completed at the third shutdown feathering speed. Through the method, the device can enable thewind turbine generator set to have a good load reduction effect in the shutdown process.

Description

technical field [0001] The present application relates to the technical field of feathering shutdown of wind turbines, in particular, to a variable speed feathering shutdown method, device and wind turbines. Background technique [0002] In order to reduce the load of the wind turbine during shutdown, a variable-speed feathering shutdown scheme is often used to control the shutdown of the wind turbine. However, the existing variable-rate feathering shutdown scheme uses fixed time or pitch angle position as the conversion condition of variable rate, which makes the load reduction effect of wind turbines not good. Contents of the invention [0003] The purpose of the present application is to provide a variable-speed feathering shutdown method, device and wind turbine, which can make the wind turbine have a good load reduction effect during shutdown. [0004] In order to achieve the above purpose, the technical solution adopted in the embodiment of the present application i...

AI Technical Summary

Problems solved by technology

However, the existing variable-rate feathering shutdown scheme uses fixed time or pitch angle position as the conversion condition of variable rate, which makes the load reduction effect of wind turbines not good.

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