Load shedding control method for wind generating set and wind generating set

Abstract

The invention provides a load shedding control method for a wind generating set, and the method is characterized in that the rotating speed and the rotating acceleration of a generator are monitored simultaneously, when the rotating speed is determined to be greater than a preset first rotating speed and the acceleration is greater than a preset first acceleration, or the rotating speed is determined to be greater than a preset second rotating speed and the acceleration is determined to be greater than a preset second acceleration, the stage of periodically setting a target rotating speed is entered, and the rotating speed of the generator is adjusted through a variable pitch system based on the target rotating speed. Since the running state of the generator is monitored based on the rotating speed and the rotating acceleration of the generator, the rotating speed of the generator can be controlled more stably under the working condition of high rotating speed and high acceleration, and the phenomena that the rotating speed is overhigh and the machine is shut down due to overhigh pneumatic torque and the parts of the wind generating set are damaged are avoided.

Description

technical field [0001] The invention relates to the field of new energy, in particular to a load reduction control method for a wind power generator set under extreme wind conditions, and a wind power generator set using the control method. Background technique [0002] At present, domestic mainstream wind turbine models are designed according to IEC standards for loads. During the development of long-blade models, the ultimate load under certain specific working conditions (such as extreme coherent gusts with simultaneous changes in wind speed and wind direction) has become a key factor. The bottleneck of unit design. It is mainly manifested in the weak ultimate bearing capacity of key joints such as between the gearbox and the generator of the wind turbine, and between the tower top and the nacelle. When the wind speed suddenly increases (such as the wind speed from 9m / s to 24m / s) and When the wind direction changes (such as the wind direction from 0 degrees to 45 degrees...

AI Technical Summary

Problems solved by technology

It is mainly manifested in the weak ultimate bearing capacity of key joints such as between the gearbox and the generator of the wind turbine, and between the tower top and the nacelle. When the wind speed suddenly increases (such as the wind speed from 9m / s to 24m / s) and When the wind direction changes (such as the wind direction from 0 degrees to 45 degrees), if the pitch system adopts the conventional integral control (PI) method to control the speed of the generator, it is easy to cause the phenomenon of overspeed shutdown of the wind turbine, resulting in blade roots and Asymmetric limit loads appear on the top of the tower, which may damage the internal components of the wind turbine in severe cases

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