Single-phase autotransformer modelling and model parameter identification

Benšić, Tin; Biondić, Ivan; Marić, Predrag

doi:10.1007/s00202-017-0534-2

Cited by 4 publications

(1 citation statement)

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“…The latter resulting from the nonlinear relationship between magnetic field strength (H) and magnetic flux density (B) within the ferromagnetic core. This nonlinear relationship is described by the magnetization curve and magnetic hysteresis loops and can be measured under material aspect [2][3][4] or by considering the equivalent circuit of entire equipments [5][6][7][8][9]. Since there is no general analytical formula for the hysteresis loops and magnetization curve, several empirical equations are used to describe the nonlinear property of the hysteresis loops, including the Preisach model [10], the Jiles-Atherton model [2,11], and Wlodarski model [12,13].…”

Section: Introductionmentioning

confidence: 99%

Modeling the Hysteresis Characteristics of Transformer Core under Various Excitation Level via On-Line Measurements

Pan

Guzzomi

2018

Electronics

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In this paper, the hysteresis characteristics of a transformer core are determined from limited on-line measured voltages and currents under certain excitations. A method for calculating the magnetization curve and hysteresis loops of the transformer core under various excitation is developed based on limited excitation conditions, and using the deep neural network, support vector regressor and the Wlodarski model. The coercivity and the amplitude of magnetic field strength of hysteresis loops can be captured with high accuracy based on this method. Then, a finite element model of the transformer core is constructed to predict the distributed magnetic flux density and the excitation current using the calculated hysteresis loops. The currents from various excitation voltages on two different transformer structures are also measured to compared with simulated currents. The outcome indicates that the overall hysteresis loops and magnetization curve of the transformer core may be useful for modeling the magnetic field and excitation current under any voltage excitation.

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