A blade feathering method for a wind turbine

Abstract

The invention discloses a blade feathering method of a wind turbine generator. At least two feathering modes are selected according to the average wind velocity during halting feathering, and the variable pitch rates of the at least two feathering modes are different. When the average wind velocity during halting feathering is low, the corresponding variable pitch rate is higher than the variablepitch rate corresponding to the higher average wind velocity. Preferably, the two feathering modes are adopted, the variable pitch rate of the first feathering mode is higher than the variable pitch rate of the second feathering mode, and if the average wind velocity during halting feathering is smaller than a preset value, the first feathering mode is adopted; and if the average wind velocity during halting feathering is larger than or equal to the preset value, the second feathering mode is adopted for feathering. According to the blade feathering method, the different feathering modes are adopted according to the different wind velocities during halting, the large variable pitch rate is adopted when the wind velocity is lower, and the small variable pitch rate is adopted when the wind velocity is higher; and compared with an existing feathering mode, stable feathering and halting of the wind turbine generator can be guaranteed, the impact load during halting is effectively reduced,and the damage possibility of the wind turbine generator is reduced.

Description

technical field [0001] The invention relates to the technical field of blade feathering of a wind turbine, in particular to a blade feathering method of a wind turbine. Background technique [0002] The wind turbine control system includes a main control system and a monitoring system. When there is a bad external environment or a fault occurs in the wind turbine, it is necessary to rely on the monitoring system for feathering and shutdown. The probability of damage to small wind turbines. [0003] At present, the wind turbine monitoring system can adopt different feathering methods according to different fault levels to stop the feathering. Feathering at propeller speed, these feathering methods are based on the state of the fan unit to determine how to feather, without considering how to reduce the load during the feathering process, to avoid damage to the unit in the event of a harsh external environment or a failure of the wind turbine unit load. With the continuous ...

AI Technical Summary

Problems solved by technology

With the continuous increase of the wind turbine rotor, the continuous increase of the tower, and the requirements for structure miniaturization and light weight based on the demand for cost reduction, the occurrence of damage loads in the above two cases has increased significantly, and the existing shutdown The feathering control method cannot meet the requirements of load reduction and smooth shutdown, so it is necessary to optimize the feathering control method in the monitoring system

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