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Five-Level T-type Cascade Converter for Rooftop Grid-Connected Photovoltaic Systems

Author

Listed:
  • Cristian Verdugo

    (Electrical Engineering Department, Polytechnic University of Catalonia, 08222 Barcelona, Spain
    These authors contributed equally to this work.)

  • Samir Kouro

    (Electronics Engineering Department, Universidad Técnica Federico Santa María, Valparaiso 2390123, Chile
    Current address: Av. España 1680, Valparaíso 2390123, Chile.
    These authors contributed equally to this work.)

  • Christian A. Rojas

    (Electronics Engineering Department, Universidad Técnica Federico Santa María, Valparaiso 2390123, Chile
    Current address: Av. España 1680, Valparaíso 2390123, Chile.
    These authors contributed equally to this work.)

  • Marcelo A. Perez

    (Electronics Engineering Department, Universidad Técnica Federico Santa María, Valparaiso 2390123, Chile
    Current address: Av. España 1680, Valparaíso 2390123, Chile.
    These authors contributed equally to this work.)

  • Thierry Meynard

    (Institut National Polytechnique de Toulouse, 31071 Toulouse, France
    These authors contributed equally to this work.)

  • Mariusz Malinowski

    (Institute of Control & Industrial Electronics, Warsaw University of Technology, 00-662 Warsaw, Poland
    These authors contributed equally to this work.)

Abstract

Multilevel converters are widely considered to be the most suitable configurations for renewable energy sources. Their high-power quality, efficiency and performance make them interesting for PV applications. In low-power applications such as rooftop grid-connected PV systems, power converters with high efficiency and reliability are required. For this reason, multilevel converters based on parallel and cascaded configurations have been proposed and commercialized in the industry. Motivated by the features of multilevel converters based on cascaded configurations, this work presents the modulation and control of a rooftop single-phase grid-connected photovoltaic multilevel system. The configuration has a symmetrical cascade connection of two three-level T-type neutral point clamped power legs, which creates a five-level converter with two independent string connections. The proposed topology merges the benefits of multi-string PV and symmetrical cascade multilevel inverters. The switching operation principle, modulation technique and control scheme under an unbalanced power operation among the cell are addressed. Simulation and experimental validation results in a reduced-scale power single-phase converter prototype under variable conditions at different set points for both PV strings are presented. Finally, a comparative numerical analysis between other T-type configurations to highlight the advantages of the studied configuration is included.

Suggested Citation

  • Cristian Verdugo & Samir Kouro & Christian A. Rojas & Marcelo A. Perez & Thierry Meynard & Mariusz Malinowski, 2019. "Five-Level T-type Cascade Converter for Rooftop Grid-Connected Photovoltaic Systems," Energies, MDPI, vol. 12(9), pages 1-20, May.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:9:p:1743-:d:229257
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    References listed on IDEAS

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    1. Jesús Muñoz-Cruzado-Alba & Christian A. Rojas & Samir Kouro & Eduardo Galván Díez, 2016. "Power Production Losses Study by Frequency Regulation in Weak-Grid-Connected Utility-Scale Photovoltaic Plants," Energies, MDPI, vol. 9(5), pages 1-21, April.
    2. Wei-Neng Chang & Ching-Huan Liao, 2017. "Design and Implementation of a STATCOM Based on a Multilevel FHB Converter with Delta-Connected Configuration for Unbalanced Load Compensation," Energies, MDPI, vol. 10(7), pages 1-17, July.
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    Cited by:

    1. Pawel Szczepankowski & Jaroslaw Luszcz & Alexander Usoltsev & Natalia Strzelecka & Enrique Romero-Cadaval, 2021. "The Conceptual Research over Low-Switching Modulation Strategy for Matrix Converters with the Coupled Reactors," Energies, MDPI, vol. 14(3), pages 1-25, January.
    2. Kui-Jun Lee, 2020. "Analytical Modeling of Neutral Point Current in T-type Three-level PWM Converter," Energies, MDPI, vol. 13(6), pages 1-11, March.
    3. Christian A. Rojas & Samir Kouro & Ruben Inzunza & Yasuaki Mitsugi & Abraham M. Alcaide, 2022. "Harmonic Impedance Model of Multiple Utility-Interactive Multilevel Photovoltaic Inverters," Energies, MDPI, vol. 15(24), pages 1-21, December.
    4. Cristian Verdugo & Jose Ignacio Candela & Pedro Rodriguez, 2021. "Quadrature Voltage Compensation in the Isolated Multi-Modular Converter," Energies, MDPI, vol. 14(3), pages 1-21, January.
    5. Chandramouli Adupa & V. Sivachidambaranathan, 2022. "Critical analysis on cascaded T-type multilevel inverter topology to grid-integrated photovoltaic systems for symmetrical voltage ratios," International Journal of System Assurance Engineering and Management, Springer;The Society for Reliability, Engineering Quality and Operations Management (SREQOM),India, and Division of Operation and Maintenance, Lulea University of Technology, Sweden, vol. 13(3), pages 1474-1484, June.
    6. Tariq Kamal & Murat Karabacak & Vedran S. Perić & Syed Zulqadar Hassan & Luis M. Fernández-Ramírez, 2020. "Novel Improved Adaptive Neuro-Fuzzy Control of Inverter and Supervisory Energy Management System of a Microgrid," Energies, MDPI, vol. 13(18), pages 1-22, September.

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