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Volume 10
Issue 4
10.3390/electronics10040409
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Article

A Cascaded DC-AC-AC Grid-Tied Converter for PV Plants with AC-Link

by
Manuel A. Barrios
1,2,*,
Víctor Cárdenas
1,
Jose M. Sandoval
1,
Josep M. Guerrero
2,* and
Juan C. Vasquez
2
1
Engineering Department, Autonomous University of San Luis Potosi, Dr. Manuel Nava No. 8, Col. Zona Universitaria Poniente, San Luis Potosí 78290, Mexico
2
Center for Research on Microgrids (CROM), Department of Energy Technology, Aalborg University, 9220 Aalborg, Denmark
*
Authors to whom correspondence should be addressed.
Electronics 2021, 10(4), 409; https://doi.org/10.3390/electronics10040409
Submission received: 8 January 2021 / Revised: 28 January 2021 / Accepted: 4 February 2021 / Published: 8 February 2021
(This article belongs to the Section Power Electronics)
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Abstract

Cascaded multilevel converters based on medium-frequency (MF) AC-links have been proposed as alternatives to the traditional low-voltage inverter, which uses a bulky low-frequency transformer step-up voltage to medium voltage (MV) levels. In this paper, a three-phase cascaded DC-AC-AC converter with AC-link for medium-voltage applications is proposed. Three stages integrate each DC-AC-AC converter (cell): a MF square voltage generator; a MF transformer with four windings; and an AC-AC converter. Then, k DC-AC-AC converters are cascaded to generate the multilevel topology. This converter’s topological structure avoids the per-phase imbalance; this simplifies the control and reduces the problem only to solve the per-cell unbalance. Two sets of simulations were performed to verify the converter’s operation (off-grid and grid-connected modes). Finally, the papers present two reduced preliminary laboratory prototypes, one validating the cascaded configuration and the other validating the three-phase configuration.
Keywords: AC-link; medium-frequency magnetic link; photovoltaic; multilevel converter; cascaded converter; AC-AC converter; matrix converter AC-link; medium-frequency magnetic link; photovoltaic; multilevel converter; cascaded converter; AC-AC converter; matrix converter

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MDPI and ACS Style

Barrios, M.A.; Cárdenas, V.; Sandoval, J.M.; Guerrero, J.M.; Vasquez, J.C. A Cascaded DC-AC-AC Grid-Tied Converter for PV Plants with AC-Link. Electronics 2021, 10, 409. https://doi.org/10.3390/electronics10040409

AMA Style

Barrios MA, Cárdenas V, Sandoval JM, Guerrero JM, Vasquez JC. A Cascaded DC-AC-AC Grid-Tied Converter for PV Plants with AC-Link. Electronics. 2021; 10(4):409. https://doi.org/10.3390/electronics10040409

Chicago/Turabian Style

Barrios, Manuel A., Víctor Cárdenas, Jose M. Sandoval, Josep M. Guerrero, and Juan C. Vasquez. 2021. "A Cascaded DC-AC-AC Grid-Tied Converter for PV Plants with AC-Link" Electronics 10, no. 4: 409. https://doi.org/10.3390/electronics10040409

APA Style

Barrios, M. A., Cárdenas, V., Sandoval, J. M., Guerrero, J. M., & Vasquez, J. C. (2021). A Cascaded DC-AC-AC Grid-Tied Converter for PV Plants with AC-Link. Electronics, 10(4), 409. https://doi.org/10.3390/electronics10040409

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