Fixed time dynamic surface high-order sliding-mode suppression method for chaotic oscillation of power system

Abstract

The invention discloses a fixed time dynamic surface high-order sliding-mode suppression method for chaotic oscillation of a power system. The suppression method comprises the steps of (1) determining the reactive power of the to-be-compensated power system; (2) establishing a mathematical model of a current source type static synchronous compensation controller, and determining the output and reference value of the current source type static synchronous compensation controller; (3) determining a control target value, wherein the output can achieve an adjacent domain with an arbitrarily small reference value within finite time, and the upper bound of the convergence time does not depend on the initial value; (4) designing a fixed time dynamic surface high-order sliding-mode surface and control law to realize target control; and (5) determining the control parameter of the designed control law according to stability analysis of the Liapunov function. By adoption of the method, system stability can be realized within predetermined time under any initial starting condition of the system; and in addition, a buffeting phenomenon is overcome, higher transient response is obtained, the convergence speed is accelerated and the stability of the power system is improved.

Description

technical field [0001] The invention belongs to the field of electrical engineering, in particular to a finite-time suppression method for chaotic oscillation of a power system. Background technique [0002] Power system, as a complex nonlinear dynamic system, has abundant nonlinear dynamic behaviors. With the continuous increase of electricity load, the modern power system is more likely to operate near the boundary of the stable domain, and chaotic oscillation will occur when the system is disturbed by the outside world. Chaotic oscillation destroys the stability of the power system, causing wind angle instability, frequency oscillation and voltage collapse, and even induces large-scale power outages. Therefore, in order to ensure the safe and stable operation of the power system, it is necessary to study the control method of the chaotic oscillation of the power system. [0003] Chaotic oscillation is an important dynamic mechanism of voltage collapse. In order to supp...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a fixed-time dynamic surface high-order sliding mode suppression method for chaotic oscillations of power systems, to overcome the shortcomings of existing control methods; to make chaotic oscillations of power systems be obtained within a limited time that does not depend on the initial value Inhibit and overcome the chattering phenomenon that occurs during the control process

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