A variable-rate feathering shutdown method for wind turbines based on nacelle acceleration

Abstract

The invention discloses a wind generating set variable rate feathering halt method based on accelerated velocity of an engine room. On the basis of a conventional control strategy, a variable rate feathering module based on the former accelerated velocity and the current accelerated velocity of the engine room is added. The method comprises the steps that when the set enters the halt logic, firstly, whether the fault type triggered by the set is software hypervelocity halt alarm or not is judged; If no, the corresponding halt logic action is taken, and if yes, the variable rate feathering haltlogic based on the accelerated velocity of the engine room is adopted; the former accelerated velocity and the current accelerated velocity of the engine room are measured in real time through a sensor; after filtering is conducted through a filter, a feathering rate value is output to be superposed with an original feathering rate value output by a controller; and then, amplitude limiting is conducted, and a final feathering rate value is multiplied by the cycling time of the controller, so that a final pitch angle given value is obtained and transmitted to a variable pitch system till all vane pitch angles reach the maximum pitch angle and the feathering halt action is completed. By means of the method, the load optimization control, under the special working condition, over the wind generating set can be achieved.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a variable-rate feathering shutdown method for a wind power generating set based on the acceleration of the nacelle. Background technique [0002] It is known in the industry that with the development of wind power generation technology and market demand, the capacity of wind turbines is getting larger and longer, and the blades are getting longer and longer, and the wind turbines often operate in relatively harsh external environments, which causes the unit load to increase. If it gets bigger and bigger, it will pose a great safety hazard to the operation of the unit and bring a negative impact on the economic benefits of the owner. [0003] When the wind speed increases sharply, it encounters the once-a-year EOG gust (Annual extreme operation gust, EOG1 for short) and power grid failure. Sudden changes in wind speed, as well as power failure (off-load) of the pow...

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problem of excessive load of the current wind power generating set in DLC1.5 (IEC-2nd), the present invention proposes a reliable wind power generating set based on the variable speed feathering shutdown method of the nacelle acceleration, and changes the shutdown process by optimizing the shutdown logic of the unit In the middle operating state of the unit, it avoids the occurrence of high speed and large pitch angle at the same time, reduces the reverse thrust, reduces the ultimate load at the bottom of the tower, and effectively realizes the load optimization control of the wind turbine under special working conditions

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