Safe shutdown method and system, and wind turbine generator

Abstract

The embodiment of the invention provides a safe shutdown method and system, and a wind turbine generator, and relates to the technical field of wind power generation. According to the safe shutdown method provided by the invention, if it is detected that communication between a master controller and a converter is disconnected, or communication is disconnected due to abnormal working conditions, such as failure of the master controller, through an additional loading mode of the converter, the speed of an impeller is effectively prevented from being increased, and reduced to be within a safe range; and therefore guarantee is provided for safe shutdown of a unit. Compared with the prior art, after the converter is designed to enter an auxiliary shutdown mode, various factors are fully considered, so that a loading electric torque of the converter can be larger than a mechanical torque of wind energy acting on the impeller all the time; the effects of inhibiting the increase of the speed and reducing the speed to be within the safe range are achieved, and the safety of the unit is ensured; and a series of serious accidents, such as blade breakage, tower drum damage and even tower falling due to overspeed galloping are avoided.

Description

Technical field[0001]The present invention relates to the field of wind power generation, and in particular, there is a safe shutdown method, a system, and a wind turbine.Background technique[0002]Wind turbines are usually installed in places where wind resources is rich, but these places are generally relatively far, natural environment is more harfous, especially in mountainous wind farms, high temperature and humidity, low temperature freezing, turbulent flow and wind cuts It is close to normal, which has made strict requirements for the safety and reliable operation of wind turbines. The unit has long running in this harsh environment, which may have various abnormal conditions for the performance failure of electronic devices, transmission parts, communication line interrupts. If the protection mechanism of the unit design is not perfect, it is likely to cause a unit speed, a blade appears. The break, tower is damaged, and even a series of serious accidents such as falling towe...

AI Technical Summary

Problems solved by technology

However, this method is slow in response and low in efficiency, and often misses the best protection opportunity (according to previous case studies, accidents usually occur within a short period of time), and it is prone to uncontrolled impeller speed and failure to close A series of unpredictable situations such as propellers, eccentric flight trips under overspeed conditions, etc., cannot ensure the safety of the unit.

[0004] There is also a method to automatically yaw crosswinds, but under the above-mentioned abnormal conditions, the speed of the unit is not controlled, and the wind speed and wind direction are also uncontrolled. If the yaw action is executed rashly, it is likely to cause the vibration of the unit to increase and expand the accident. The degree of harm, accelerating the downturn of the unit will be counterproductive, and it will take a long time for the unit to complete the yaw action of 90 degrees in the crosswind. During this process, if the wind speed increases and the speed rises too fast, the moment of inertia of the unit will be large. This method also does not achieve the effect of safe shutdown

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