Robust pitch control method for wind turbines based on ude

Abstract

The invention discloses a variable-pitch robust control method based on a UDE for a wind generating set. The method comprises the steps of creating a dynamic model of wind-driven generators on the basis of unmodeled dynamics and disturbance of the wind generating set; defining dynamic characteristics of regulation errors and expectation errors; rewriting the dynamic model of the wind generating set and obtaining a preliminary expression of a pitch angle controller; arranging a low pass filter for carrying out approximation on non-affine uncertain items and disturbance terms of the dynamic model of the wind-driven generators, substituting the approximation result into the preliminary expression of the pitch angle controller, carrying out Laplace transformation, carrying out inverse Laplace transformation after merging and sorting and obtaining final pitch angle control signals. In the design process, the problem that the design of a non-affine system controller is difficult is solved, the unmodeled dynamics and the environmental disturbance of a system are fully considered, the structure of an obtained controller is simple, the number of needed parameters is small, the robustness is good, the anti-jamming capability is high, a more stable wind wheel rotation speed and more stable generation power can be provided, and high-quality electric energy can be provided for a power grid.

Description

technical field [0001] The invention relates to the technical field of control of wind power generating sets, in particular to the pitch control of the high wind speed section of the variable pitch wind generating set. Background technique [0002] In recent years, due to the increasing contradiction between socioeconomic development and resource shortage, wind power has developed rapidly worldwide. Compared with other renewable energy sources, wind energy has its unique advantages. By the end of 2015, the total installed capacity of wind power in the world had reached 432.419GW. In the past ten years, the total installed capacity of wind turbines in China has grown at an annual growth rate of more than 19%. [0003] Wind turbines are generally divided into two categories: fixed-pitch constant-speed wind turbines and variable-pitch variable-speed wind turbines. Variable-pitch and variable-speed wind turbines have good stability, high work efficiency, and can achieve maxim...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the non-affine uncertain characteristics of wind turbines and solve the problem that the existing pitch angle controllers do not consider the dynamics of the system and environmental interference, the present invention provides a stable speed in the high wind speed section, simple and quick parameter adjustment, The robust pitch control method can better deal with the system's non-affine uncertain characteristics, unmodeled dynamics and disturbances, and provide more stable power generation to meet the needs of most pitch-variable wind power generation systems

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