A Unidirectional Single-Stage Three-Phase Soft-Switched Isolated DC-AC Converter

Pal, Anirban and Basu, Kaushik (2019) A Unidirectional Single-Stage Three-Phase Soft-Switched Isolated DC-AC Converter. In: IEEE TRANSACTIONS ON POWER ELECTRONICS, 34 (2). pp. 1142-1158.

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Abstract

This paper presents a novel single-stage soft-switched high-frequency-link three-phase dc-ac converter topology. The topology supports unidirectional dc to ac power flow and is targeted for applications like grid integration of photovoltaic sources, fuel cell, etc. The high frequency magnetic isolation results in reduction of system volume, weight, and cost. Sine-wave pulsewidth modulation is implemented in dc-side converter. Though high-frequency switched, dc-side converter is soft switched for most part of the line cycle. The ac-side converter active switches are line frequency switched incurring negligible switching loss. The line frequency switching of ac-side converter facilitates use of high voltage blocking inherently slow semiconductor devices to generate high voltage ac output. In addition, a cascaded multilevel structure is presented in this paper for direct medium-voltage ac grid integration. A detailed circuit analysis considering nonidealities like transformer leakage and switch capacitances, is presented in this paper. A 6-kW three-phase laboratory prototype is built. The presented simulation and experimental results verify the operation of the proposed topologies.

Item Type:	Journal Article
Publication:	IEEE TRANSACTIONS ON POWER ELECTRONICS
Publisher:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Additional Information:	Copyright of this article belongs to IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords:	Cascaded multilevel inverter; dc-ac converter; high-frequency transformer (HFT); pulsewidth modulation (PWM); rectifier-type HFL; single stage; zero-voltage switching (ZVS)
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	28 Jan 2019 08:55
Last Modified:	28 Jan 2019 08:55
URI:	http://eprints.iisc.ac.in/id/eprint/61473

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