Method for controlling dynamic bifurcation of wind driven generator based on nonlinear feedback control

Abstract

The invention discloses a method for controlling dynamic bifurcation of a wind driven generator based on nonlinear feedback control. The method comprises the following steps of: 1, establishing a simplified dynamic model of a doubly-fed inductor motor; 2, designing a Hopf bifurcation controller by adopting a nonlinear feedback control rule; 3, inhibiting sub-critical bifurcation; 4, calculating a frequency value; 5, calculating a period value of a voltage signal; 6, measuring an angular speed; and 7, controlling the dynamic bifurcation. The method has the advantages that: 1, the transfer of a Hopf bifurcation point of a system can be realized, the stability region of the system is enlarged, the sub-critical bifurcation is inhibited, simultaneously the stability and the amplitude value of a limit cycle can be controlled, and the voltage oscillation of the system can be inhibited; 2, a very good control effect for the wind driven generator is achieved by designing the Hopf bifurcation controller by adopting the nonlinear feedback control rule; and 3, a circuit design method is simple and easy to implement.

Description

(1) Technical field: [0001] The invention relates to the field of control of wind power generators, in particular to a dynamic branch control method of wind power generators based on nonlinear feedback control. (two) background technology: [0002] As renewable energy is increasingly valued by governments around the world, wind power technology has increasingly become a hot topic in the field of science and technology. The wind power system is a strong electromechanical coupling system, and there is a complex nonlinear coupling relationship between its electrical parameters and mechanical parameters. Therefore, there are a large number of mechanical and electrical oscillations in the system, which correspond to the dynamic bifurcation of the bifurcation theory. Bifurcation phenomena are generally very complex, such as periodic oscillations in voltage when a large power grid is about to collapse. Hopf bifurcation is the most representative dynamic bifurcation, and it is also...

AI Technical Summary

Problems solved by technology

Hopf bifurcation is the most representative dynamic bifurcation, and it is also a phenomenon that often occurs in wind power systems. It often leads to continuous periodic oscillation or increasing amplitude of the system, which eventually leads to system oscillation instability.

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