Step-up Transformerless Seven-level DC-AC Hybrid Topology for Interconnection of Renewable-based DC Sources to Microgrids

This article introduces a new step-up transformerless multi-level DC-AC hybrid topology for interconnecting renewable DC sources to loads or microgrids. This enabling technology incorporates the best characteristics of three modified basic topologies-a DC-DC multi-level boost converter, a DC-DC mult...

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Bibliographic Details
Published in:Electric power components and systems 2014-12, Vol.42 (16), p.1792-1801
Main Authors: Rodríguez, Juan Ramón, Moreno-Goytia, Edgar Lenimirko, Rebollar, Vicente Venegas, Ugalde, Luis Eduardo, Salgado-Herrera, Nadia María
Format: Article
Language:English
Subjects:
DC-AC converter
DC-DC converter
Density
Design engineering
Direct current
Electric currents
Electric power generation
Electric power grids
Electrical equipment
Electricity distribution
field-programmable gate array
Hybrid structures
microgrids
multi-level boost converter
multi-level buck converter
Network topologies
Prototypes
Renewable resources
Switches
Topology
transformerless
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Summary:This article introduces a new step-up transformerless multi-level DC-AC hybrid topology for interconnecting renewable DC sources to loads or microgrids. This enabling technology incorporates the best characteristics of three modified basic topologies-a DC-DC multi-level boost converter, a DC-DC multi-level buck converter, and an H-bridge-to obtain a seven-level step-up DC-AC hybrid structure using only one DC input and nine power switches for a single-phase output with field-programmable gate array based control. The advantages of the step-up seven-level structure compared to other proposals are higher efficiency, a reduced number of power switches, and high power density associated with transformerless characteristic. Furthermore, in contrast to conventional topologies, the proposed design does not require voltage/current monitoring of the capacitors or a capacitor-balancing control scheme, and only one DC source input is used. Consequently, a high-performance configuration is obtained. The laboratory results demonstrate the validity of the design and the performance of the prototype.
ISSN:1532-5008
1532-5016
DOI:10.1080/15325008.2014.949910