Five-level T-type cascade converter for rooftop grid-connected photovoltaic systems
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Data publicació2019-05-08
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Abstract
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.
CitacióVerdugo, C. [et al.]. Five-level T-type cascade converter for rooftop grid-connected photovoltaic systems. "Energies", 8 Maig 2019, vol. 12, núm. 9, p. 1743-1-1743-20.
ISSN1996-1073
Versió de l'editorhttps://www.mdpi.com/1996-1073/12/9/1743
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