A method for maximum wind energy capture of variable speed wind turbines

Abstract

The invention relates to a maximum wind energy capturing method of variable-speed wind generating sets. The method includes that current optimum rotary speed of a plurality of wind generators is estimated by capturing conditions of wind energy through the wind generators within previous control periods and is taken as the input of a controller, errors are reduced through proportional control on the basis of an indirect speed control algorithm, the optimum rotary speed in tracking the wind generators is realized, and the maximum output power is acquired. With the method, precise modeling of the wind generators is not needed, nor is measuring of wind velocity; simpleness in structure is achieved, parameters are easy to adjust, production energy is higher than that by a maximum wind energy capturing method and a speed velocity indirect control method which are commonly used in industry, influence of environment factors and structural changes of the wind generators on energy generation can be weakened, a control objective that most of the wind generators are lower than rated wind velocity sections can be met, and great application values are achieved.

Description

technical field [0001] The invention relates to the technical field of control of wind power generators, in particular to the maximum wind energy capture control of the low wind speed section of the wind power generator. Background technique [0002] Wind energy is a green, non-polluting and renewable new energy source. Therefore, the capture of wind energy is of great significance for solving environmental pollution and energy crisis. In recent years, wind power conversion technology has achieved rapid development worldwide. Adopting power electronic technology with variable speed and constant frequency, the variable-pitch and variable-speed wind turbines gradually improved on the basis of the original fixed-pitch and fixed-speed wind turbines have become the mainstream type of wind power installed capacity. The power generation state of variable-pitch and variable-speed wind turbines can be roughly divided into two stages, the maximum wind energy capture stage in the low ...

AI Technical Summary

Problems solved by technology

[0017] In order to overcome the shortcomings of the indirect speed control algorithm traditionally used in the industry, which has poor tracking performance and is greatly affected by the wind turbine's own structure and environmental changes, the present invention proposes a maximum wind energy capture method for variable-speed wind turbines, as follows:

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