Variable-pitch brake control method for preventing galloping of wind generating set

Abstract

The invention discloses a variable-pitch brake control method for preventing galloping of a wind generating set. A control system and a brake device are included, the control system comprises a variable-pitch controller and an overspeed switch, the output end of the overspeed switch is electrically connected with the input end of the brake device, the brake device is a passive electromagnetic brake, and the passive electromagnetic brake is used for being in a brake release state when power is off and can brake a variable-pitch motor when power is on. The variable-pitch brake control method has the beneficial effects that under the condition that a fan control system loses efficacy or is seriously overspeed, blades can be retracted through thrust generated by wind power according to the power-off and brake-loosening characteristics of the passive electromagnetic brake, the safety of a fan is ensured, and the whole system is doubly guaranteed through the overspeed switch, so that galloping accidents caused by incapability of effectively changing a pitch when the control system fails are prevented.

Description

technical field [0001] The invention belongs to the field of industrial automation control, and in particular relates to a control method for pitch-variable braking to prevent a wind turbine from flying off. Background technique [0002] With the rapid development of science and technology and the improvement of human living standards, in the development of new energy, the utilization of wind energy has attracted the attention of countries all over the world. The use of new energy can effectively reduce environmental pollution, and wind energy is a clean and renewable energy, and the use of wind energy can largely achieve the purpose of energy saving and emission reduction. In order to make more effective use of wind energy, large-scale wind power generators (hereinafter referred to as fans) are used to convert wind energy into electrical energy for utilization, and the safe operation of the fan is guaranteed by various systems, among which the pitch system is particularly c...

AI Technical Summary

Problems solved by technology

[0010] At present, the vast majority of wind turbines are equipped with active electromagnetic brakes, that is, electromagnetic brakes with power supply release. The pitch controller sends a signal to turn on the electromagnetic brakes for pitch operation. If the pitch control system fails to retract the pitch in time when the pitch backup power supply is out of power, the wind turbine will be in danger of speeding up, and even cause a serious accident in which the entire wind turbine collapses.

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