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Analysis of Grid-Connected Three-Phase Three-Wire Voltage-Source Converters Operating with Unbalanced Conditions

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Abstract

Since the future grid needs to provide sufficient electrical energy with high quality, it is envisaged that most of the used energy will be supplied by grid-connected voltage source converters (VSCs). The VSCs are used for connecting renewable energy source to the grid, e.g., wind and solar power. The grid-connected VSC considered in this paper is a three-phase three-wire full-bridge converter in which a capacitor is connected to its dc side, while its ac-side is connected to the grid with current control. When operating under unbalanced voltages at the point of common coupling, either due to the presence of unbalanced loads or due to a grid fault condition, a voltage ripple appears at the dc side. The interaction between the VSC dc- side voltage ripple and the VSC ac-side currents is the main focus of this study. In this paper, we analyze the interaction between the VSC dc-side voltage ripple and the VSC ac-side currents under unbalanced voltages. Furthermore, the proposed model is used to determine in which conditions the stability of the VSC ac-side currents can be guaranteed even in the presence of the dc-side voltage ripple. Experimental results confirm that the system remains stable, although with distorted currents due to the dc voltage ripple. Furthermore, it is also shown that the injection of negative sequence currents can decrease the current distortion.

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Acknowledgements

The authors would like to thank the anonymous reviewers who helped to improve the final version of the work. The authors would like to thank the agency FAPESP for the grants 2022/00317-3 and 2016/08645-9.

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Author notes

  1. Claudionor Francisco Nascimento, Edson Hirokazu Watanabe, Luis Guilherme Barbosa Rolim and Andre Guilherme P. Alves have contributed equally to this work.

Authors and Affiliations

  1. Hydro-Quebec, Institut de Recherches, 1800 Bd Lionel-Boulet, Varennes, QC, J3X 1S1, Canada

    Oumar Diene

  2. PEE/COPPE, Federal University of Rio de Janeiro, Cidade Universitária, Rio de Janeiro, RJ, 21945-970, Brazil

    Oumar Diene, Edson Hirokazu Watanabe, Luis Guilherme Barbosa Rolim & Andre Guilherme P. Alves

  3. DEE-CCET, Federal University of São Carlos, P.O. Box 676, São Carlos, SP, 13565-905, Brazil

    Claudionor Francisco Nascimento

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  1. Oumar Diene
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Correspondence to Oumar Diene.

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Diene, O., Nascimento, C.F., Watanabe, E.H. et al. Analysis of Grid-Connected Three-Phase Three-Wire Voltage-Source Converters Operating with Unbalanced Conditions. J Control Autom Electr Syst 35, 92–104 (2024). https://doi.org/10.1007/s40313-023-01048-8

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  • DOI: https://doi.org/10.1007/s40313-023-01048-8

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