Five-Level T-type Cascade Converter for Rooftop Grid-Connected Photovoltaic Systems
Multilevel converters are widely considered to be the most suitable configurations for renewable energy sources. Their high-power quality, efficiency and performance make them interesting for PV applications. In low-power applications such as rooftop grid-connected PV systems, power converters with...
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doaj-05f8e0a6f2a1496ab7d0b564d7c08ea52020-11-25T02:07:59ZengMDPI AGEnergies1996-10732019-05-01129174310.3390/en12091743en12091743Five-Level T-type Cascade Converter for Rooftop Grid-Connected Photovoltaic SystemsCristian Verdugo0Samir Kouro1Christian A. Rojas2Marcelo A. Perez3Thierry Meynard4Mariusz Malinowski5Electrical Engineering Department, Polytechnic University of Catalonia, 08222 Barcelona, SpainElectronics Engineering Department, Universidad Técnica Federico Santa María, Valparaiso 2390123, ChileElectronics Engineering Department, Universidad Técnica Federico Santa María, Valparaiso 2390123, ChileElectronics Engineering Department, Universidad Técnica Federico Santa María, Valparaiso 2390123, ChileInstitut National Polytechnique de Toulouse, 31071 Toulouse, FranceInstitute of Control & Industrial Electronics, Warsaw University of Technology, 00-662 Warsaw, PolandMultilevel converters are widely considered to be the most suitable configurations for renewable energy sources. Their high-power quality, efficiency and performance make them interesting for PV applications. In low-power applications such as rooftop grid-connected PV systems, power converters with high efficiency and reliability are required. For this reason, multilevel converters based on parallel and cascaded configurations have been proposed and commercialized in the industry. Motivated by the features of multilevel converters based on cascaded configurations, this work presents the modulation and control of a rooftop single-phase grid-connected photovoltaic multilevel system. The configuration has a symmetrical cascade connection of two three-level T-type neutral point clamped power legs, which creates a five-level converter with two independent string connections. The proposed topology merges the benefits of multi-string PV and symmetrical cascade multilevel inverters. The switching operation principle, modulation technique and control scheme under an unbalanced power operation among the cell are addressed. Simulation and experimental validation results in a reduced-scale power single-phase converter prototype under variable conditions at different set points for both PV strings are presented. Finally, a comparative numerical analysis between other T-type configurations to highlight the advantages of the studied configuration is included.https://www.mdpi.com/1996-1073/12/9/1743grid-connected photovoltaic systemscascade multilevel convertersmultistring convertersT-type converters |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Cristian Verdugo Samir Kouro Christian A. Rojas Marcelo A. Perez Thierry Meynard Mariusz Malinowski |
spellingShingle |
Cristian Verdugo Samir Kouro Christian A. Rojas Marcelo A. Perez Thierry Meynard Mariusz Malinowski Five-Level T-type Cascade Converter for Rooftop Grid-Connected Photovoltaic Systems Energies grid-connected photovoltaic systems cascade multilevel converters multistring converters T-type converters |
author_facet |
Cristian Verdugo Samir Kouro Christian A. Rojas Marcelo A. Perez Thierry Meynard Mariusz Malinowski |
author_sort |
Cristian Verdugo |
title |
Five-Level T-type Cascade Converter for Rooftop Grid-Connected Photovoltaic Systems |
title_short |
Five-Level T-type Cascade Converter for Rooftop Grid-Connected Photovoltaic Systems |
title_full |
Five-Level T-type Cascade Converter for Rooftop Grid-Connected Photovoltaic Systems |
title_fullStr |
Five-Level T-type Cascade Converter for Rooftop Grid-Connected Photovoltaic Systems |
title_full_unstemmed |
Five-Level T-type Cascade Converter for Rooftop Grid-Connected Photovoltaic Systems |
title_sort |
five-level t-type cascade converter for rooftop grid-connected photovoltaic systems |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2019-05-01 |
description |
Multilevel converters are widely considered to be the most suitable configurations for renewable energy sources. Their high-power quality, efficiency and performance make them interesting for PV applications. In low-power applications such as rooftop grid-connected PV systems, power converters with high efficiency and reliability are required. For this reason, multilevel converters based on parallel and cascaded configurations have been proposed and commercialized in the industry. Motivated by the features of multilevel converters based on cascaded configurations, this work presents the modulation and control of a rooftop single-phase grid-connected photovoltaic multilevel system. The configuration has a symmetrical cascade connection of two three-level T-type neutral point clamped power legs, which creates a five-level converter with two independent string connections. The proposed topology merges the benefits of multi-string PV and symmetrical cascade multilevel inverters. The switching operation principle, modulation technique and control scheme under an unbalanced power operation among the cell are addressed. Simulation and experimental validation results in a reduced-scale power single-phase converter prototype under variable conditions at different set points for both PV strings are presented. Finally, a comparative numerical analysis between other T-type configurations to highlight the advantages of the studied configuration is included. |
topic |
grid-connected photovoltaic systems cascade multilevel converters multistring converters T-type converters |
url |
https://www.mdpi.com/1996-1073/12/9/1743 |
work_keys_str_mv |
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