Thrust reduction control algorithm of wind generating set

Abstract

The invention discloses a thrust reduction control algorithm of a wind generating set. The algorithm includes the steps that first, the cabin acceleration of the wind generating set is measured in real time through a sensor; then a corresponding minimum pitch angle is obtained through a look-up table method according to the measured cabin acceleration; and afterwards, the minimum pitch angle value is input to a variable pitch controller of the wind generating set to be compared with the minimum pitch angle value set by the variable pitch controller, the maximum value is taken as a novel minimum pitch angle limit value of the controller, in other words, the thrust borne by the set can be changed by changing the minimum pitch angle limit value of the controller in real time, and thus load optimizing control of the wind generating set based on the cabin acceleration can be realized. By the adoption of the control algorithm, wind wheel thrust of the set can be effectively reduced, and therefore blade, hub and tower loads are lowered, and performance of the wind generating set is improved comprehensively. Hence, the control algorithm has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of load control of wind power generators, in particular to a thrust reduction control algorithm of wind power generators. Background technique [0002] 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 a relatively harsh external environment, which causes the unit load to increase. It constitutes a great safety hazard to the operation of the unit and brings negative impact on the owner's economic benefits. [0003] Aiming at the problem of excessive unit load, there are currently many solutions, among which the following two solutions are common: [0004] 1. Strengthen the unit components to improve the safety performance of the unit; [0005] 2. Optimizing the control strategy and optimizing the load reduction control of the unit. [00...

AI Technical Summary

Problems solved by technology

[0007] In the normal operating area of ​​the wind turbine, when the tip speed ratio is constant, the thrust coefficient Ct will gradually decrease with the increase of the blade pitch angle β. The above methods are all based on this principle. By adjusting the propeller The set value of the distance angle is used to reduce the thrust of the unit, thereby reducing the load of the unit, but there are still deficiencies. Among them, the Fine pitch schedule strategy has the problem of large loss of power generation, and the Dynamic Fine pitch schedule strategy is only at rated It works above the wind speed, and the Dynamic thrust limiting strategy is only for certain extreme conditions

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