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Modified Transformerless Series-Connected Current Source Converter Without Series-Connected Switches | IEEE Journals & Magazine | IEEE Xplore

Modified Transformerless Series-Connected Current Source Converter Without Series-Connected Switches


Abstract:

Transformerless series-connected current source converters (SC-CSCs) were recently proposed. Compared with existing ones, they eliminate the transformer, giving significa...Show More

Abstract:

Transformerless series-connected current source converters (SC-CSCs) were recently proposed. Compared with existing ones, they eliminate the transformer, giving significant reductions in cost and size. However, they need the use of series-connected switches in medium/high-voltage applications, and as a result, very complicated voltage balancing schemes are required. To address this challenge, a modified transformerless SC-CSC is proposed. In the modified one, the series-connected switches are replaced with a cascaded half-bridge converter, while the left remains the same as existing ones. By doing so, the need for series-connected switches is eliminated, while the advantages of original converters are well retained. In addition, the cascaded half-bridge converter has inherent voltage balancing, reduced switching frequencies, and a unique zero-load feature. The operation principle of the modified converter is presented. The performance is verified by both simulations and lab-scaled experiments.
Published in: IEEE Transactions on Industrial Electronics ( Volume: 70, Issue: 12, December 2023)
Page(s): 12331 - 12339
Date of Publication: 17 January 2023

ISSN Information:


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