Control method and device for avoiding run-away and wind turbine

A control device for avoiding a wind turbine run-away, comprising:

• a processor;
• and
• a memory for storing instructions executable by the processor;
• wherein the processor is configured to:
• determine whether a brake system of the wind turbine has failed or not;
• if the brake system has failed, calculate an initial crosswind position based on a current wind direction angle, and enable a yaw system of the wind turbine to perform a crosswind operation based on the initial crosswind position;
• perform a long-period filter processing on wind direction data acquired during a crosswind process to obtain an average wind direction angle, and perform a short-period filter processing on the wind direction data to obtain an instantaneous wind direction angle;
• determine whether a wind direction has a sudden change or not based on the average wind direction angle and the instantaneous wind direction angle;
• and
• if the wind direction has the sudden change, calculate a new crosswind position based on the average wind direction angle, and enable the yaw system to perform a crosswind operation based on the new crosswind position.