Method for preventing wind generating set from runaway

Abstract

The invention provides a method for preventing a wind generating set from runaway. After a fan master control system sends a variable pitch instruction for certain time, a pitch control system cannot be tracked in real time and is considered as failure when the rotating speed of a wind wheel exceeds a given value. According to the method, under the condition that the pitch control system of the fan fails, the fan is controlled to yaw for 90-degree crosswind, accordingly, the wind energy absorption of the wind wheel is maximum, the rotating speed of the wind wheel is rapidly reduced, and the fan can be protected from being damaged to the greatest extend after failure of variable pitch of the fan.

Description

technical field [0001] The invention relates to a method for preventing a wind power generating set from flying, which is suitable for a wind generating set with three blades, variable pitch, upwind direction and active yaw. Background technique [0002] At present, the main braking system of wind turbines is aerodynamic brakes. The variable pitch wind turbines adjust the blade pitch angle to 90° through the pitch system. The entire blade forms a damping plate, and the airflow does not affect the blade. Torque, so that the speed of the wind rotor is reduced to act as a brake. The main reason for the speeding is that the blades cannot be feathered to 90° when the wind rotor is overspeeding. As the wind speed increases, the wind rotor turns faster and faster, eventually causing an accident. The pitch control mechanisms of wind turbines include hydraulic pitch control and electric pitch control. The failure causes of the hydraulic system are mainly: power plant failure, contro...

AI Technical Summary

Problems solved by technology

Any of the above-mentioned reasons will cause feathering failure and lead to speeding accidents, resulting in heavy losses. At