Single-Stage MVAC-LVDC SST with Reduced Current Stress and Switch Count

Harisyam, PV and Mazumder, S and Basu, K (2024) Single-Stage MVAC-LVDC SST with Reduced Current Stress and Switch Count. In: 2024 Energy Conversion Congress and Expo Europe, ECCE Europe 2024, 2 September 2024-6 September 2024, Darmstadt.

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Abstract

Conventional high-power DC applications requiring medium voltage (MV) grid integration such as renewable, electric vehicle fast-charging use Line Frequency Transformers (LFT) to step down MV to low voltage (LV) before connecting to a AC-DC converter. LFTs are quite heavy and bulky which reduces the overall power density and therefore solid state transformers have the potential to replace them in such applications. Cascaded multi level configuration with input series output parallel combination per phase has emerged as a promising solution among different MVAC to LVDC solutions. The power density and reliability can be further improved by having single stage solution by eliminating the requirement of large DC link capacitors required per phase. However, large device count and high-frequency current stress is still a challenge in these solutions which needs to be solved. This paper introduces a novel single-stage dual-active-bridge-derived solid-state transformer designed to minimize device count, current stress, switching losses, and enhance improve overall efficiency and power density. Validation using simulation software and experimental verification is presented with a scaled down laboratory-scale prototype. © 2024 IEEE.

Item Type:	Conference Paper
Publication:	ECCE Europe 2024 - Energy Conversion Congress and Expo Europe, Proceedings
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to the publisher.
Keywords:	Distribution transformers; Fast charging (Batteries); High frequency transformers; HVDC power transmission; Magnetic levitation vehicles; Surface discharges; Thin film transistors; Vehicle-to-grid, Current stress; Dual active bridges; High frequency HF; High-frequency-link; Phase shift modulation; Power densities; Single stage; Solid state transformer; State-transformers; Triple-phase-shift modulation, DC transformers
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	27 Dec 2024 09:45
Last Modified:	27 Dec 2024 09:45
URI:	http://eprints.iisc.ac.in/id/eprint/87210

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