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3 results on '"AC-to-AC converters"'

1. Direct AC–AC Converters Using Commercial Power Modules Applied to Voltage Restorers.

Author

Soeiro, Thiago B., Petry, Clovis A., Fagundes, João C. dos S., and Barbi, Ivo

Subjects
*ELECTRIC current converters, *ALTERNATING currents, *ELECTRIC potential, *ELECTRONIC modulation, *ELECTRIC switchgear, *ELECTRIC inductors, *TRANSISTORS
Abstract

The focus of this paper is the study of direct alternating-current (ac)–ac converters, beginning by buck, half-bridge, full-bridge, and push–pull converters. From the basic converters, we apply a simple methodology to make the use of switches in commercial configurations possible. Following that, eight voltage restorers supplied either on the line side or on the load side are proposed. A comparative evaluation of these topologies concerning implementation, complexity, and component effort is presented. It is notable that some of the studied topologies are known in the literature and others are new. For one of the presented topologies, the design of a 3-kVA voltage restorer is developed, and experimental results are shown, certifying the correct operation of the drive strategy used. [ABSTRACT FROM AUTHOR]

Published
2011
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2. Improvement of the PF using symmetrical angle switched single- & three-phase rectifiers in micro hydro power plants

Author

Bory Prevez, Henry, Martínez García, Herminio, Vazquez Seisdedos, Luis, García Vílchez, Encarnación, Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica, and Universitat Politècnica de Catalunya. EPIC - Energy Processing and Integrated Circuits

Subjects
Convertidors altern-altern, Controlled rectifiers, Switching AC/AC converters, AC-to-AC converters, Symmetrical switching, Power factor, Enginyeria electrònica [Àrees temàtiques de la UPC]
Abstract

Micro-size hydro power plants (µHPPs) are commonly used at remote areas to supply islanded AC micro-grids. A typical way to control grid frequency is to manipulate active power dissipated in ballast loads by AC/AC converters. However, these asymmetrically switched thyristor controlled converters consume reactive power degrading the power factor at the generator output. In this paper the operation of a symmetric angle switched, bridged three-phase rectifier and three single-phase rectifiers connected in series with ballast load, are studied to improve the power factor of the system. As a consequence, the objective is to evaluated the use of the three and single-phase rectifiers switched with symmetrical angle to improve the power factor, by reactive power compensation, at the output terminal of the electric generator of µHPPs that use ballast load to regulate frequency.

Published
2020

3. Symmetrical angle switched single–phase and 3–phase rectifiers: application to micro hydro power plants

Author

Bory Prevez, Henry, Vazquez Seisdedos, Luis, Martínez García, Herminio, Majanne, Yrjö, Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica, and Universitat Politècnica de Catalunya. EPIC - Energy Processing and Integrated Circuits

Subjects
Convertidors altern-altern, Controlled rectifiers, Switching AC/AC converters, AC-to-AC converters, Symmetrical switching, Power factor, Enginyeria electrònica [Àrees temàtiques de la UPC]
Abstract

Micro-size hydro power plants are commonly used at remote areas to supply islanded AC micro-grids. A typical way to control grid frequency is to manipulate active power dissipated in ballast loads by AC/AC converters. However, these asymmetrically switched thyristor controlled converters consume reactive power degrading the power factor at the generator output. In this paper the operation of a symmetric angle switched, bridged three-phase rectifier and three single-phase rectifiers connected in series with ballast load, are studied to improve the power factor of the system. As a consequence, the objective is to evaluated the use of the three and single-phase rectifiers switched with symmetrical angle to improve the power factor, by reactive power compensation, at the output terminal of the electric generator of µHPPs that use ballast load to regulate frequency.

Published
2019

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