Galloping preventing safety control method for wind generating set

Abstract

The invention provides a galloping preventing safety control method for a wind generating set, which particularly comprises the following steps: in case of troubles on the wind generating set, the master control system PLC ( programmable logic controller) of the wind generating set enters a stopping process; after stopping is judged or being under a PLC safe mode, a current transformer is started to enter into a safe mode, the safe mode of the current transformer can enable the current transformer to screen non-critical troubles and maintain the work of the wind generating set utmost, when the effective rotational speed of the wind turbine generator is higher than the starting rotational speed, the current transformer generates electricity and operates; and when the rotational speed of the wind turbine generator is not higher than the starting rotational speed, the current transformer is not in operation. According to the invention, the control link of the PLC safe mode is added, the safe grade of the control system of the wind generating set is enhanced greatly, and potential safety hazards caused by blower galloping due to incontrollable pitch variation are reduced greatly.

Description

technical field [0001] The invention relates to a safety control method for anti-coasting of a wind power generating set. Background technique [0002] At present, the control system of megawatt-level direct-drive wind turbines has a relatively complete control logic and protection mechanism, which can prevent the occurrence of wind turbine overrun accidents. However, if the control system fails, the pitch control mechanism will not be able to return to the feathered state, and the wind turbine generator will be continuously accelerated by the continuous wind energy, exceeding the structural load requirements of the wind turbine generator set tower, which will eventually cause the generator bearing to break or even the unit to collapse. The occurrence of major flying accidents. In the wind turbine generator control system, the protection mechanism usually classifies and judges faults according to each sub-component. Once the protection mechanism of any sub-component is trig...

AI Technical Summary

Problems solved by technology

[0004] However, the disadvantages of the above-mentioned prior art are as follows: when a wind turbine failure occurs, the control system will start the shutdown process, stop the converter, no load will be applied, and the generator will be in the no-load operation state

As for the shutdown process, there is only one situation where the wind turbine may be in danger of speeding, that is, the three blades cannot be retracted at the same time.

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