An Efficiency Analysis of 27 Level Single-Phase Asymmetric Inverter without Regeneration

Eduardo Espinosa, Pedro Melín, Carlos Baier, José Espinoza and Hugo Garcés
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Eduardo Espinosa: Department of Electrical Engineering, Universidad Católica de la Santísima Concepción, Concepción 4090541, Chile
Pedro Melín: Department of Electrical and Electronic Engineering, Universidad del Bío-Bío, Concepción 4051381, Chile
Carlos Baier: Department of Electrical Engineering, Universidad de Talca, Curicó 3340000, Chile
José Espinoza: Department of Electrical Engineering, Universidad de Concepción, Concepción 4070386, Chile
Hugo Garcés: Department of Computer Science, Universidad Católica de la Santísima Concepción, Concepción 4090541, Chile

Energies, 2021, vol. 14, issue 5, 1-14

Abstract: For medium voltage applications, multilevel inverters are used. One of its classic topologies is the Cascaded H-Bridge, which requires isolated DC voltages to work. Depending on the DC voltage ratio used in the Cascaded H-bridge can be classified into symmetric and asymmetric. In comparison between symmetric and asymmetric inverters, the latter can generate an AC output voltage with more output voltage levels. DC voltage ratio most documented are binary and trinary. The last can generate an AC voltage of 3 n = 27 levels is obtained, using n = 3 inverters in cascade and NLM modulation, which generates a flow power of the load to the inverters (regeneration). This work analyzes the semiconductor losses (switching and conduction) and the THD of the AC output voltage in function of index modulation, considering a non-regenerative modulation technique for a 27-level single-phase asymmetric inverter. To confirm the theoretical analyzes, simulation and experimental results are shown.

Keywords: DC—AC Converters; THD minimization; efficiency; asymmetric inverters (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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