DC–AC Bidirectional Converters for Application in Isolated Microgrids

This article sets out the design for control loops and the development of a 40-kW bidirectional converter for applications in isolated microgrids. This is the grid-forming converter, responsible for controlling the voltage and frequency of the microgrid. It is connected to an energy storage system a...

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Bibliographic Details
Published in:Journal of control, automation & electrical systems automation & electrical systems, 2021, Vol.32 (4), p.1087-1098
Main Authors: de Souza Ribeiro, Luiz Antonio, de Matos, José Gomes, Saavedra, Osvaldo Ronald, Caracas, João Victor Mapurunga, de Carvalho Farias, Guilherme, de Paula Assunção Pinheiro, Lucas, Pinheiro, Narana Milhomem
Format: Article
Language:English
Subjects:
Alternating current
Control
Control and Systems Theory
Data buses
Distributed generation
Electric converters
Electric potential
Electric power systems
Electrical Engineering
Energy conversion efficiency
Energy storage
Engineering
Installation costs
Mechatronics
Power flow
Robotics
Robotics and Automation
Topology
Voltage
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Summary:This article sets out the design for control loops and the development of a 40-kW bidirectional converter for applications in isolated microgrids. This is the grid-forming converter, responsible for controlling the voltage and frequency of the microgrid. It is connected to an energy storage system and must have a bidirectional power flow. There is also a description of the topology and respective design of the control loops. Experimental results demonstrated the efficiency of the converter in controlling the charging and discharging current of the battery bank, the DC bus voltage of the converter, and the voltage and frequency of the AC microgrid system. Two units of this converter were installed in a real-time isolated microgrid at Ilha Grande (Grande Island), located in the northeast of Brazil. The purpose of this project was to replace the inverter/rectifier devices previously used to provide a bidirectional power flow. Tests conducted with the new converter showed a significant improvement in power quality, in the efficiency of the electric power system, and reduced installation costs.
ISSN:2195-3880
2195-3899
DOI:10.1007/s40313-021-00748-3