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A Two-Phase Five-Level Converter With Least Number of Power Switches Requiring Only a Single DC Source

Naik, B Satish and Umanand, L and Gopakumar, K and Reddy, B Subba (2018) A Two-Phase Five-Level Converter With Least Number of Power Switches Requiring Only a Single DC Source. In: IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS, 6 (4). pp. 1942-1952.

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Official URL: http://dx.doi.org/10.1109/JESTPE.2018.2791403


A novel single dc source fed five-level converter topology for medium-voltage high-power isolated grid-tied systems requiring only 12 power switches is proposed. The present configuration has two stages namely, five-level converter and the Scott-T transformer. The five-level converter stage generates only two phase voltages. Latter, these voltages are converted into three phases by using the Scott-T transformer connection. This topology requires less number of power devices and its associated gate drivers in comparison to any existing topology. In addition, the dc-link capacitors used in the topology have an ability to self-balance by themselves which eliminates the requirement of capacitor balance circuitry and complex control algorithms. The overall component count in the present configuration is very less in comparison to other topologies. Further, each device in the converter is stressed to only half of the dc-link voltage. A level-shifted carrier pulsewidth modulation scheme is adopted to control the converter, and proportional integral controllers are used to inject current into the grid at unity power factor. Theoretical analysis and simulation of the proposed converter are performed and a prototype with 1 kVA rating is validated by connecting it to a three-phase grid.

Item Type: Journal Article
Additional Information: Copy right for this article belong to IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords: Cascaded H-bridge (CHB); full bridge; low-voltage devices; multilevel inverter; multilevel converter (MLC); pulsewidth modulation (PWM)
Department/Centre: Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Division of Electrical Sciences > Electrical Engineering
Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research
Date Deposited: 19 Nov 2018 14:42
Last Modified: 19 Nov 2018 14:42
URI: http://eprints.iisc.ac.in/id/eprint/61098

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