Rapid parameter identification method of chaotic ferroresonance system of coal mine power grid

Abstract

The invention provides a rapid parameter identification method for a chaotic ferroresonance system of a coal mine power grid, and is suitable for the field of electrical engineering. The method designs a nonlinear controller according to a fixed time stability theory and combines with a traditional adaptive control method, so that the control amount can reach any small neighborhood of the reference value in a limited time. More specifically, the method has the advantages that: uncertain parameters of the chaotic ferroresonance system of the coal mine power grid can be identified in a limited time without depending on the initial value; the time range of a parameter identification can be guaranteed to have an upper bound, and the upper bound of the recognition time can be calculated by themethod provided by the present invention; and ferroresonance parameters can be rapidly and accurately acquired, thereby providing a parameter support for preventing and controlling abnormal operationsof transformer overvoltage and overcurrent, and providing a theoretical basis and a technical support for safety operation research of the coal mine power grid.

Description

technical field [0001] The invention designs a fast parameter identification method, which is especially suitable for the fast parameter identification method of a chaotic ferromagnetic resonance system of a coal mine power grid used in the field of electrical engineering. Background technique [0002] Ferromagnetic resonance is an oscillation phenomenon of nonlinear inductance and capacitance in a power system. It is a complex electrical phenomenon. It may occur in a power transformer or an electromagnetic voltage transformer (PT) and a reactor with an iron core. In the loop formed by non-linear inductance elements and capacitance elements. So far, scholars at home and abroad have studied ferromagnetic resonance for a hundred years, but ferromagnetic resonance still occurs frequently in power systems, and various harmonic elimination measures cannot completely eliminate ferromagnetic resonance. The main reason is that the generating circuit of ferromagnetic resonance is ex...

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Problems solved by technology

[0004] The finite time identification method can identify system parameters in a finite time, but it is limited by the limitation of finite time stability—it is affected by the initial conditions of the system, and the initial conditions of the system are generally difficult to obtain accurate parameters in coal mine power grids

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