Design method of robust pitch controller above rated wind speed for wind turbine

Abstract

The invention introduces a design method and control method of a robust pitch controller above the rated wind speed of a wind power generator. The pitch controller design method first establishes the blade load model, performs vector transformation to achieve decoupling, and linearizes the decoupling model in the vertex set of the scheduling parameter convex set; secondly, converts the model into an LPV system, and uses H The ∞ theory standardizes the model as a standardized augmented control object containing performance indicators, uses the linear matrix inequality method to design the controllers on the vertex set of the convex set of scheduling parameters, and uses the gain scheduling principle to obtain the global pitch controller, and finally uses the vector The inverse of the transform yields the actual control signal.

Description

technical field [0001] The invention relates to the development of clean and environment-friendly energy, in particular to a robust control method for reducing the mechanical load of wind turbine blades above the rated wind speed. Background technique [0002] As a kind of green energy, wind energy is more and more popular. But in many cases, wind turbine blades often work in a fatigue state for a long time due to uneven force, and thus break prematurely, causing huge losses. Reducing the mechanical load on the wind turbine blades is an effective way to prolong the working life of the wind turbine and increase the power level. [0003] Due to the nonlinear and random characteristics of the wind energy system, the unit loads affected by the wind also show strong nonlinearity, uncertainty, and parameter dependence. Therefore, it is difficult to achieve the control target with the traditional control method of linear time-invariant system. At present, the most commonly used ...

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Problems solved by technology

[0006] The problem solved by the present invention is: to overcome the deficiencies in the prior art, aiming at the characteristics of wind turbine fatigue load strong nonlinearity and uncertainty, parameter dependence, uncertain wind energy disturbance, etc., a method based on Linear Parameter Varying (Linear Parameter Varying, LPV) is proposed. ) and Gain Scheduling (GS) H∞ robust control method to solve the robust control of reducing the mechanical load of the wind turbine, and improve the wind turbine load in the case of strong nonlinearity, model uncertainty, and parameter dependence Accuracy and robustness of load shedding control, reducing algorithm complexity

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