Hybrid model to evaluate the frequency-dependent leakage inductance of partially-filled transformers

Sharma, Angshuman; Kimball, Jonathan W.

doi:10.1016/j.pedc.2023.100038

Hybrid model to evaluate the frequency-dependent leakage inductance of partially-filled transformers

Journal Article · Thu Mar 16 00:00:00 EDT 2023 · Power Electronic Devices and Components

DOI:https://doi.org/10.1016/j.pedc.2023.100038· OSTI ID:1991822

Sharma, Angshuman ^[1]; ^[2]

Missouri University of Science and Technology, Rolla, MO (United States); Missouri University of Science and Technology
Missouri University of Science and Technology, Rolla, MO (United States)

The leakage inductance of a transformer designed for a power electronic converter can drop significantly as the switching frequency is increased due to skin and proximity effects. Although the magnetic image method-based double-2-D model can predict the low-frequency leakage inductance of a partially-filled transformer with sufficient accuracy, it is inherently a frequency-independent model. While Dowell’s 1-D model uses frequency-dependent relations to account for both skin and proximity effects, its accuracy is severely affected by the assumed winding geometry. In this paper, a semianalytical hybrid model is proposed that uses superposition to combine a modified Dowell’s model with the double-2-D model to predict the true leakage inductance of partially-filled transformers at any given frequency. All three conductor types—round, foil, and litz wire—are modeled and analyzed. The quasi-2-D model is further investigated on a variable inductance transformer (VIT) whose winding geometry can be modified mechanically to vary its leakage inductance. With less than 5 % error throughout, the semi-analytically evaluated leakage inductances are in excellent agreement with the finite element method (FEM) simulated and experimentally measured leakage inductances.

View Accepted Manuscript (DOE)

Research Organization:: Missouri University of Science and Technology, Rolla, MO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO)

Grant/Contract Number:: EE0008449

OSTI ID:: 1991822

Journal Information:: Power Electronic Devices and Components, Journal Name: Power Electronic Devices and Components Vol. 5; ISSN 2772-3704

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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References (20)

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