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A Chaos Control Method Based on Feedback Linearization Theory

A technology of feedback linearization and chaos control, which is applied in the direction of single-network parallel feed arrangement, reduction/prevention of power oscillation, etc., can solve problems such as inability to compensate nonlinear system, improve self-adaptive ability and intelligent level, and achieve good robustness sticky effect

Inactive Publication Date: 2011-12-28
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

The variable feedback control method is to reduce the influence of the nonlinear term of the system by adjusting the feedback coefficient, and then suppress the chaos, so that the system enters the inherently unstable periodic orbit of the chaotic attractor. The stable periodic orbit limits the application of this method; the nonlinear feedback control method can compensate the nonlinearity of the system model, so it can suppress the chaotic oscillation phenomenon, so it can realize the stable control of the power system. However, this method requires that the system must be accurately established mode, otherwise the controller cannot compensate the nonlinearity of the system
In addition, even if the controller compensates the nonlinearity of the system, the system will not undergo chaotic oscillation under the action of the controller, but because the periodic load disturbance still exists, the system cannot return to the initial equilibrium point, but in a certain cycle run on track

Method used

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  • A Chaos Control Method Based on Feedback Linearization Theory
  • A Chaos Control Method Based on Feedback Linearization Theory
  • A Chaos Control Method Based on Feedback Linearization Theory

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Embodiment

[0023] Embodiment: a kind of chaos control method based on feedback linearization theory (see figure 1 , figure 2 ), characterized in that it comprises the following steps:

[0024] (1) Using feedback linearization theory to design a dynamic linearization model of a dynamic system unipolar inverter topology circuit (see figure 1 ), wherein, V1, V2, V3 and V4 are the power switching devices that make up the converter, the DC side of the converter has a voltage stabilizing capacitor C, and the AC side is connected to the power grid; the power switching devices can be IGBT or IGCT switches device;

[0025] (2) For an n-order nonlinear dynamic system, if the system has a relative order r, the system is input-output linearizable, and if the system has a relative order n, then the system is input-to-state and input-to-output linearizable ; Then, for a nonlinear system that can be linearized for input and output, carry out coordinate transformation, carry out homeomorphic transfo...

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Abstract

The invention relates to a chaotic control method based on a feedback linearization theory. The method comprises the following steps of: (1) designing a dynamic linearization model monopolar inversion topological circuit of a dynamic system by using the feedback linearization theory; (2) performing coordinate conversion on a nonlinear system which can be subjected to input and output linearization; (3) performing feedback linearization on the external state of the system through state feedback; (4) designing a chaotic vibration controller u; and (5) selecting appropriate feedback gain and pole assignment to stably control the system. The chaotic control method has the advantages that: 1, different from the general linearization, the feedback linearization fulfills the aim of linearizationthrough strict state conversion and feedback instead of linear approximation of the dynamic characteristic; and 2, the controlled variable can be applied at any moment, and the control method is highin robustness when a model error and measurement noise are generated.

Description

(1) Technical field: [0001] The invention relates to the field of feedback control and chaos control of electric power system, in particular to a chaos control method based on feedback linearization theory. (two) background technology: [0002] The traditional methods of suppressing chaotic oscillation include variable feedback control method and nonlinear feedback control method. The variable feedback control method is to reduce the influence of the nonlinear term of the system by adjusting the feedback coefficient, and then suppress the chaos, so that the system enters the inherently unstable periodic orbit of the chaotic attractor. The stable periodic orbit limits the application of this method; the nonlinear feedback control method can compensate the nonlinearity of the system model, so it can suppress the chaotic oscillation phenomenon, so it can realize the stable control of the power system. However, this method requires that the system must be accurately established ...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/38
Inventor 周雪松李劲马幼捷陈浩梁芳
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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