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A Single-Phase ac-dc-ac Unidirectional Three-Leg Converter
This article presents a single-phase ac-dc-ac unidirectional three-level three-leg converter. It is composed by a unidirectional T-type leg at the input side, a bidirectional T-type leg at the load side and a bidirectional T-type leg that is shared between the input and load. The proposed converter...
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Published in: | IEEE transactions on industrial electronics (1982) 2021-05, Vol.68 (5), p.3876-3886 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | This article presents a single-phase ac-dc-ac unidirectional three-level three-leg converter. It is composed by a unidirectional T-type leg at the input side, a bidirectional T-type leg at the load side and a bidirectional T-type leg that is shared between the input and load. The proposed converter allows feeding the load voltage with a sinusoidal voltage that has both constant amplitude and frequency. It also keeps the well-known merits of a T-type leg, such as lower conduction losses and better power quality, associated with the reduced component count provided by the shared-leg. Therefore, the proposed converter is a good candidate for ac-dc-ac low-medium-voltage applications, in which efficiency and power quality are major selection criteria. A detailed analysis of the converter is provided, including the converter model, a complete control strategy and a space-vector pulsewidth modulation (PWM) technique. The space-vector PWM technique was developed aiming to reduce switching losses, while ensuring five-level multilevel voltages at both the grid and load sides, and equalizing the unbalance caused by the mid-point dc-link capacitor's connection. In order to validate the theoretical analysis, simulated and experimental results are presented and discussed. |
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ISSN: | 0278-0046 1557-9948 |
DOI: | 10.1109/TIE.2020.2987261 |