Brake control method of wind driven generator yaw system

Abstract

The invention relates to a brake control method of a wind driven generator yaw system. When the yaw system is in a yawing state, the excitation power source of a yaw motor is connected forwards; when the yawing of the yaw system is completed, the excitation power source of the yaw motor is connected reversely; when the rotating speed of the yaw motor is zero, the reverse excitation power source is disconnected from the yaw motor. According to the brake control method of the wind driven generator yaw system, after the yawing of the yaw system is completed, the excitation power source of the yaw motor is connected reversely, and at the moment, the direction of rotation of the yaw motor is opposite to the direction of rotation of a rotating magnetic field; in other words, when the electromagnetic torque generated by the yaw motor is a braking torque, the yaw motor decelerates quickly; meanwhile, the two ends of the armature of the yaw motor are connected to an exciting coil and energized to generate a magnetic field, the armature is pulled in by a magnet yoke and then a yaw bearing is mechanically braked by the armature and by use of a connecting flange, and due to the combination of the magnetic field and the mechanical braking, the braking distance is shortened and the accuracy of braking is guaranteed.

Description

technical field [0001] The invention relates to the field of wind power generating equipment, in particular to a braking control method for a yaw system of a wind power generator. Background technique [0002] The yaw system of the wind turbine is also called the wind-facing device. Its function is to quickly and smoothly align the wind direction when the direction of the wind speed vector changes, so that the wind rotor can obtain the maximum wind energy. The yaw system of the traditional wind turbine drives the yaw bearing to rotate through the yaw motor. In order to reduce the torque during yaw, the yaw motor is decelerated by the coaxial reducer, and the yaw torque acts on the large rotating body. On the gear, the wind wheel is driven to yaw against the wind. When the wind wheel and the wind vector form a vertical angle, that is, when the maximum wind energy is obtained, the motor is controlled to brake, and the yaw is completed. The traditional yaw system braking syste...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a braking control method for the yaw system of a wind power generator to solve the problems in the prior art that the yaw system is easy to produce a braking distance error, the braking process is unstable, the vibration of the wind turbine cabin is too large, and the brake disc is seriously worn out.

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