Control method and control system for wind turbine emergency feathering

Abstract

The invention discloses a control method and a control method for emergent feathering of a wind turbine generator. Safety positions and stop positions are adjacently arranged at the periphery of a variable pitch bearing of the wind turbine generator in the blade feathering rotating direction in sequence; a limiting device is arranged on an inner ring of the variable pitch bearing; and when bladesare positioned in a zero-pitch angle position, spacing angles between the limiting device and the stop positions are near a normal working angle range of blades. The control method comprises the following steps: a variable pitch motor drives the blades to rotate in the feathering direction; a variable pitch driver monitors the rotating positions of the blades; and when the limiting device is rotated to the safety positions, the variable pitch driver controls the variable pitch motor to reduce the feathering rotating speeds of the blades according to a preset mode. The method and the system canreduce impact and vibration to the unit in emergent feathering of the wind turbine generator, prevent increment of the fatigue load of the unit, prolong the service life of the unit, and meanwhile, can effectively reduce the unloading pressure of energy consumption elements.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a control method and a control system for emergency feathering of a wind turbine. Background technique [0002] In variable-speed constant-frequency wind turbines, the pitch system of the wind turbine not only has the functions of adjusting power and stabilizing the speed, but also has the function of aerodynamic braking. [0003] The specific function of the pneumatic brake is: in order to ensure the safety of the wind turbine, the pitch system must be able to realize emergency feathering in case of any failure of the wind turbine, so that the blades of the wind turbine can be feathered to the stop position to prevent the wind turbine from Fly, or avoid damage to the internal electronics. [0004] Please refer to figure 1 , figure 1 It is a schematic diagram of the relationship between pitch speed and blade position during emergency feathering of the existing pi...

AI Technical Summary

Problems solved by technology

After emergency feathering and the limit switch is triggered, the pitch system will immediately set the control speed of the pitch motor to 0, thus increasing the unloading pressure of the energy-consuming components

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