Control method and module for preventing overspeed of wind generating set

Abstract

The invention discloses a control method and module for preventing overspeed of a wind generating set. According to the method, firstly, a cabin front and back acceleration, a pitch angle and a generator speed are measured in real time through a sensor, and a generator speed deviation is calculated according to a generator speed set value; secondly, the cabin front and back acceleration is multiplied by the generator speed deviation to obtain a monitoring index value for judging whether to start a pitch adjustment strategy, a corresponding threshold value is obtained according to real-time pitch angle linear interpolation, and the pitch adjustment strategy is started when the monitoring index value is greater than or equal to the threshold value; in other words, an additional pitch angle is superposed in an original pitch changing instruction output by a pitch changing controller of the wind generating set so as to achieve the purpose of inhibiting sharp increase of the generator speedin advance, or otherwise the pitch adjustment strategy is not started; and finally, a pitch changing actuator adjusts the pitch angle of a blade according to the pitch changing instruction sent by the pitch changing controller. Therefore, load optimization control of the wind generating set based on the cabin front and back acceleration and the generator speed deviation is realized.

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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