Active DC-Bias Mitigation Method for a Single-Phase Transformer-Connected Converter through DC-Link Measurement

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Abstract

DC-bias in the magnetic flux is a common challenge for transformer-connected converters. Typically, in isolated switched-mode converters, it is induced by a DC current flowing through one or more windings of the transformer. This bias can increase the core losses of the transformer and drive the transformer core into saturation, which deteriorates the performance of the transformer and can even result in the malfunctioning of the converter. Conventional methods for DC-bias mitigation involve expensive sensing circuitry and/or impair the performance of the converter. The proposed method utilizes the fact the DC-bias current through the transformer will result in a switching-frequency current component in the DC-link current of the converter. A band-pass filter can for example used to indirectly measure the switching-frequency current component and then mitigate that in a closed-loop manner. Both simulation results and experimental measurements are provided to verify the theoretical analysis and effectiveness of the proposed method.

Original languageEnglish
Title of host publicationIECON 2023- 49th Annual Conference of the IEEE Industrial Electronics Society
PublisherInstitute of Electrical and Electronics Engineers
Pages1-5
Number of pages5
ISBN (Electronic)979-8-3503-3182-0
DOIs
Publication statusPublished - 16 Nov 2023

Funding

ACKNOWLEDGMENT This publication is part of the project NEON (with project number 17628 of the research programme Crossover which is (partly) financed by the Dutch Research Council (NWO)).

FundersFunder number
Nederlandse Organisatie voor Wetenschappelijk Onderzoek

    Keywords

    • DC-bias
    • dual-active bridge
    • flux balancing
    • isolated converters
    • magnetic saturation

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