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Lagrangian model of an isolated dc-dc converter with a 3-phase medium frequency transformer accounting magnetic cross saturation
Abstract
This article presents a nonlinear equivalent circuit model of an isolated dc-dc converter with a 3-phase medium frequency transformer. The model takes into account the magnetic cross saturation of the 3-phase core-type magnetic circuit. The model is suitable in detailed electromagnetic transient simulations of power systems involving isolated dc-dc converters. The model is developed using the Lagrange energy method. It involves a matrix of dynamic inductances containing a nonlinear term resulting from core magnetization and a linear term resulting from leakage flux. The model parameters are determined based on a series of magnetostatic finite element method simulations. This approach is convenient when applied to high power transformers offering a limited characterization effort, or if the transformer prototype does not exist. The experimental validation performed on a novel 3-phase MFT prototype in a 100kW 1.2kV 20kHz dual active bridge converter has proved the validity of the model and model parameters. The no-load steady-state and inrush tests and the full-load test show a very good fit between the simulated and experimentally measured waveforms. The comparison with a classical simplified model neglecting magnetic cross saturation shows a significant difference in the no-load inrush test.
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Authors (5)
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Piotr Dworakowski
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Alexis Fouineau
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Martin Guillet
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- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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IEEE TRANSACTIONS ON POWER DELIVERY
no. 36,
pages 880 - 889,
ISSN: 0885-8977 - Language:
- English
- Publication year:
- 2021
- Bibliographic description:
- Dworakowski P., Wilk A., Michna M., Fouineau A., Guillet M.: Lagrangian model of an isolated dc-dc converter with a 3-phase medium frequency transformer accounting magnetic cross saturation// IEEE TRANSACTIONS ON POWER DELIVERY -Vol. 36,iss. 2 (2021), s.880-889
- DOI:
- Digital Object Identifier (open in new tab) 10.1109/tpwrd.2020.2995879
- Verified by:
- Gdańsk University of Technology
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