Pitch control method for wind turbines combining fuzzy feedforward and linear active disturbance rejection

Abstract

Aiming at the problems of intrinsic great inertia of a wind generating set and difficulty in accurate mathematical modeling, the invention provides a wind generating set variable-pitch control method combining fuzzy feed-forward with linear active disturbance rejection. The method includes: firstly, constructing a mathematical model of a variable-pitch wind generating set and obtaining output active power of the wind generating set; secondly, designing a linear active disturbance rejection controller on the basis of the step 1, and rapidly eliminating perturbation and external disturbance effects of unmodeled system portions by adjusting controlling quality of the active disturbance rejection controller; thirdly, designing a fuzzy feed-forward controller on the basis of the step 2, and obtaining a proper feed-forward pitch angle variation betaf, wherein the fuzzy feed-forward controller comprises a fuzzy feed-forward controller rule list; and finally, adding the feed-forward pitch angle variation betaf to an output u of the linear active disturbance rejection controller so that a pitch angle set value betar is obtained. By the method, adjusting time of a system is shortened, stability and reliability of the system are enhanced, and the controllers have distinct advantages over existing traditional controllers.

Description

technical field [0001] The invention belongs to the field of control systems of wind turbines, and in particular relates to pitch control of wind turbines combined with fuzzy feedforward and linear active disturbance rejection. Background technique [0002] In order to reduce the load of the wind turbine to prolong its service life, suppress the fluctuation of the output power of the wind turbine to reduce the adverse impact on the grid, large and medium-sized wind turbines usually adopt variable pitch control above the rated wind speed, that is, by changing the pitch angle of the wind turbine, Then change the wind energy utilization coefficient accordingly to keep the unit output power stable. However, the wind turbine has a large moment of inertia and serious nonlinearity, and the natural wind speed varies widely, which makes it difficult to control the pitch control system. [0003] At present, most wind turbines use PID controllers to control the variable pitch system, ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the inherent large inertia of wind turbines and the difficulty of accurately establishing mathematical models, and to provide a pitch control method for wind turbines that combines fuzzy feedforward and linear active disturbance rejection

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