A control method and module for preventing wind turbine from overspeeding

Abstract

The invention discloses a control method and module for preventing overspeed of a wind power generating set. Firstly, the front and rear acceleration of the nacelle, the pitch angle and the generator speed are measured in real time by a sensor, and the generator speed deviation is calculated according to the generator speed setting value, and then Multiply the front and rear acceleration of the engine room by the generator speed deviation to obtain the monitoring index value of whether to start the pitch control strategy, and obtain the corresponding threshold value according to the linear interpolation of the real-time pitch angle. When the monitoring index value is greater than or equal to the threshold value, the pitch control strategy is started. That is, an additional pitch angle is superimposed on the original pitch command output by the pitch controller of the wind turbine to achieve the purpose of suppressing the soaring speed of the generator in advance, otherwise the pitch control strategy will not be started. Finally, the pitch actuator will be based on The pitch command issued by the pitch controller adjusts the pitch angle of the blades, so as to realize the load optimization control of the wind turbine based on the front and rear acceleration of the nacelle and the deviation of the generator speed.

Description

technical field [0001] The invention relates to the technical field of wind power generators, in particular to a control method and module for preventing wind power generators from overspeeding. Background technique [0002] With the development of wind power generation technology and the demand of the market to reduce the cost of electricity, the capacity of wind turbines is getting larger and longer, and the blades are getting longer and longer, and the units often operate in relatively harsh external environments, which causes the load of the units to increase. Large, it poses a great challenge to the design and operation of the unit, and brings potential risks to the owner's economic benefits. [0003] When the unit encounters EOG gust wind conditions accompanied by power failure of the power grid, the unit will bear a huge unfavorable load. The process is described as follows: EOG gust (Annual extreme operation gust, EOG for short, commonly known as straw hat wind), the...

AI Technical Summary

Problems solved by technology

[0006] Improve the safety performance of the unit by strengthening the strength of the unit components, that is, increase the size of the unit components or replace them with materials with better performance, which will inevitably increase the weight and cost of the unit, resulting in an increase in the cost per kilowatt-hour of wind turbines and reducing competitiveness

Therefore, the second scheme is a common method and research hotspot in this field at present, but the existing technologies are uneven and still need to be further improved

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