Emergency blade collection method for wind turbine generator

Abstract

The invention discloses an emergency blade collection method for a wind turbine generator. According to the method, the blade collection action of a wind turbine generator under the emergency working condition is achieved through nonconstant variable blade speeds. The method specifically comprises the steps that (1) a blade collection control program comprising different variable blade speeds and variable blade times corresponding to the different variable blade speeds is preestablished; and (2) and whether the working condition of the wind turbine generator meets the blade collection control program starting conditions or not is judged, if yes, the blade collection control program is executed, and if not, the working condition of the wind turbine generator is continuously monitored. The method further comprises a fault protection step. Through the preestablished blade collection control program, when the emergency shutdown working conditions are met, the blade collection action is conducted at the nonconstant variable blade speeds, impact on the wind turbine generator due to the resonance frequency of the wind regime and the wind turbine generator is reduced, the safety of the wind turbine generator during emergency shutdown is better ensured, the tower drum production cost is reduced, the safety performance of the wind turbine generator is improved, and a foundation for further enlargement of the wind turbine generator is laid.

Description

technical field [0001] The invention relates to the technical field of wind turbine pitch control, in particular to an emergency pitch reduction method for a wind turbine. Background technique [0002] With the continuous reduction of traditional fossil fuel energy reserves and the rapid development of new energy technologies, wind power has been widely used around the world, and the installed capacity of wind power has increased year by year. The large increase in the number of wind turbines has led to more complex installation environments and wind conditions for wind turbines, and fewer and fewer wind resource areas that can be used. Requirements present new demands and challenges. [0003] To adapt to the low wind speed, the blades and unit capacity of wind turbines need to be enlarged, which leads to the increasing diameter of the impellers and the increase of the load impact on the wind turbines, which has a negative impact on the safety of the wind turbines, the stre...

AI Technical Summary

Problems solved by technology

[0003] To adapt to the low wind speed, the blades of the wind turbine and the capacity of a single unit need to be enlarged, which leads to the increasing diameter of the impeller and the increase of the load impact on the wind turbine. new big challenge

[0004] The current wind turbines use a constant variable pitch speed to retract to a safe position when a fault occurs and the emergency shutdown occurs. The wind turbines will be impacted by a large load, which increases the unsafety of the wind turbines and improves the wind turbine tower. production cost

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