A system and method for emergency shutdown control of a wind power generating set

Abstract

The invention relates to an emergency shutdown control system and an emergency shutdown control method for a wind generating set. The method comprises the following steps that when the set operates, a safety system continuously sends a high level signal; when the set goes wrong, the safety system triggers the emergency feathering and offline of a frequency converter according to an emergency shutdown signal and simultaneously judges whether a master control system is effective and whether the rotating speed is lower than a set threshold value; when the master control system is effective and the rotating speed is lower than the set threshold value, a high speed shaft brake is started; when the master control system loses the effectiveness, the high speed shaft brake is started after time is directly delayed; and when the fault of the set is eliminated, the high speed shaft brake is released. The system comprises an emergency shutdown trigger module, a master control system rotating speed detection module, a safety system emergency shutdown module, a hydraulic system and the high speed shaft brake. According to the invention, the wind generating set can be enabled to be still safely and rapidly shut down under the condition that the master control system loses the effectiveness; the safety of the wind generating set is protected; and the hardware cost of the wind generating set does not need to be additionally increased.

Description

technical field [0001] The invention relates to the field of safety control of a wind power generating set, in particular to an emergency stop control system and method for a wind generating set. Background technique [0002] In order to ensure the safe operation of wind turbines, in addition to the safety control strategy of the main control system, large wind turbines also have a set of safety systems independent of the main control system, also known as safety chains, whose execution level is higher than The master control system controls the execution level of the system. [0003] The safety system connects all serious fault points that threaten the safety of the fan through the safety relay, including emergency shutdown, overspeed detection, twisted cable limit switch, vibration detection, etc. Once the safety chain is broken, the wind turbine will go off-grid instantly and perform emergency feathering, so as to ensure the safety of the turbine to the greatest extent. ...

AI Technical Summary

Problems solved by technology

The existing command system generally controls the braking and release of the high-speed shaft brake directly through the main control system, but if the main control system fails suddenly and the communication is interrupted, the high-speed shaft brake will not operate, which may cause damage to the unit. serious damage

And if additional hardware is connected to the safety system, it will increase the cost of the unit

[0005] This shows that above-mentioned existing a kind of wind power generating set emergency stop control system and method obviously still have inconvenience and defect in structure, method and use, and need to be further improved urgently

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