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Design and Optimization of High-frequency Transformer for Isolated Single-Stage Three-Phase AC/DC Converter using Bidirectional Switches | IEEE Conference Publication | IEEE Xplore

Design and Optimization of High-frequency Transformer for Isolated Single-Stage Three-Phase AC/DC Converter using Bidirectional Switches

Publisher: IEEE

Abstract:

This paper presents the design and optimization of the high-frequency transformer for an isolated single-stage three-phase AC/DC converter enabled by the 4H-SiC BiDirecti...View more

Abstract:

This paper presents the design and optimization of the high-frequency transformer for an isolated single-stage three-phase AC/DC converter enabled by the 4H-SiC BiDirectional Field Effect Transistor (BiDFET). Non-dominated Sorting Genetic Algorithm II (NSGA-II) is used to perform a multiobjective optimization to minimize loss, weight, and volume. A 20 kW, 50 kHz hardware prototype based on the selected optimal point is characterized by a power amplifier. The finite element analysis simulation results are also presented to validate the core magnetic flux density and winding electric field strength. The experimental prototype was tested at 800 V dc /480 V rms at 10 kW rated power.
Date of Conference: 29 October 2023 - 02 November 2023
Date Added to IEEE Xplore: 29 December 2023
ISBN Information:

ISSN Information:

Publisher: IEEE
Conference Location: Nashville, TN, USA

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I. Introduction

The first monolithic SiC four-quadrant (4Q) switch has been fabricated with two 1.2 kV 4H-SiC JBSFETs connected in a common-drain configuration [1]. An isolated AC/DC converter for grid-tied photovoltaic (PV) three-phase commercial application shown as Fig 1, is proposed to demonstrate the feasibility and to showcase the system-level benefits of using monolithic BiDFET [2]. The proposed converter has a full-bridge inverter using 2-quadrant switches on the PV-side, whereas the matrix converter on the grid-side operates by switching any two-phases during a switching period. Owing to the new switching sequence enabled by the 4Q BiDFET, a multi-level staircase voltage is imposed on the isolation transformer, in which the excitation for such converter is different from a traditional DAB converter [3]. The converter can be operated as an inverter or as a rectifier depending on the application. In this work, the inverter mode is used to interface the 800 Vdc PV with the 480 Vrms power grid.

References

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