Yaw shutdown control method and system for wind turbine generator

Abstract

The invention discloses a yaw shutdown control method and system for a wind turbine generator. The method comprises the steps of issuing an instruction for reducing the rotating speed to a yaw driver, and controlling a yaw motor to reduce the rotating speed to a preset rotating speed R1; increasing the yaw braking torque; and issuing a de-enabling instruction to the yaw driver, and controlling the yaw motor to brake. The system comprises a main control module used for issuing the instruction for reducing the rotating speed to the yaw driver and controlling the yaw motor to reduce the rotating speed to the preset rotating speed R1; a hydraulic yaw braking module used for increasing the yaw braking torque; and a de-enabling module used for issuing the de-enabling instruction to the yaw driver and controlling the yaw motor to brake. According to the yaw shutdown control method and system for the wind turbine generator provided by the invention, before the pressure of the hydraulic yaw braking module rises to a specified value, the yaw motor still can be ensured to have enough power output, and the situation that a cabin is pushed by external wind power to generate displacement and overspeed under the high wind speed condition due to insufficient power of the cabin is avoided.

Description

technical field [0001] The invention relates to the technical field of wind power control, in particular to a method and system for controlling yaw shutdown of a wind turbine. Background technique [0002] Large horizontal axis wind turbines generally use an electric yaw system to adjust the rotor and align it with the wind direction. The yaw system generally includes an anemometer, a yaw motor (often using an asynchronous motor), a yaw motor controller (often using a frequency converter or a soft starter), a yaw planetary gear reducer, and a yaw braking system (often using a Hydraulic braking system, when the yaw ends, the nacelle needs to rely on the braking force provided by the braking system to firmly fix the current yaw angle to prevent the nacelle from being pushed by the external wind to cause angular displacement), the large gear of the rotating body, etc. The anemometer acts as a sensing element to convert changes in wind speed and direction into electrical signal...

AI Technical Summary

Problems solved by technology

After the yaw hydraulic braking system is put into use, since the yaw braking torque of the nacelle increases gradually with the gradual increase of the oil pressure, the yaw hydraulic braking The braking force provided by the system is relatively small and cannot meet the requirements. At this time, if the ambient wind suddenly increases sharply, the nacelle will have the problem of overspeeding of the yaw velocity (angular velocity) under the push of the wind load.

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