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Backstepping Control of NPC Multilevel Converter Interfacing AC and DC Microgrids

Author

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  • J. Dionísio Barros

    (Departamento de Engenharia Eletrotécnica, Faculdade de Ciências Exatas e da Engenharia, Universidade da Madeira, Campus Universitário da Penteada, 9020-105 Funchal, Portugal
    Instituto de Engenharia de Sistemas e Computadores: Investigação e Desenvolvimento em Lisboa, INESC-ID, Rua Alves Redol, 1000-029 Lisboa, Portugal
    Grupo de Investigação em Engenharia Eletrotécnica e de Computadores, GIEEC, Campus Universitário da Penteada, 9020-105 Funchal, Portugal)

  • Luis Rocha

    (Instituto de Engenharia de Sistemas e Computadores: Investigação e Desenvolvimento em Lisboa, INESC-ID, Rua Alves Redol, 1000-029 Lisboa, Portugal
    Instituto Superior de Engenharia de Lisboa, Polytechnic Institute of Lisbon, Rua Conselheiro Emídio Navarro, 1959-007 Lisboa, Portugal)

  • J. Fernando Silva

    (Instituto de Engenharia de Sistemas e Computadores: Investigação e Desenvolvimento em Lisboa, INESC-ID, Rua Alves Redol, 1000-029 Lisboa, Portugal
    Departamento de Engenharia Eletrotécnica e de Computadores, Instituto Superior Técnico, University of Lisbon, INESC-ID, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)

Abstract

This work introduces modified backstepping methods to design controllers for neutral point clamped (NPC) converters interfacing a DC/AC microgrid. The modified backstepping controllers are derived from a proper converter model, represented in dq coordinates, and are designed to regulate the DC voltage and to balance the two NPC converter DC capacitor voltages through a DC offset in the sinusoidal pulse width modulation (SPWM) carriers. The averaged and separated dynamics backstepping controllers also enforce nearly sinusoidal AC currents at a given power factor. The two proposed NPC converter controllers are evaluated through MATLAB/Simulink simulations and experimental implementation using a laboratory prototype. Simulations and experimental results show that the two modified backstepping controllers regulate the microgrid DC voltage in steady state and in transient operation, even with load disturbances or DC voltage reference changes, while enforcing nearly AC sinusoidal currents at a given power factor or injected reactive power. The modified backstepping-controlled NPC converter is bidirectional, converting energy from DC renewable energy sources or storage systems to AC or charging storage systems from AC. The results also highlight the effective balancing of the NPC DC capacitor voltages.

Suggested Citation

  • J. Dionísio Barros & Luis Rocha & J. Fernando Silva, 2023. "Backstepping Control of NPC Multilevel Converter Interfacing AC and DC Microgrids," Energies, MDPI, vol. 16(14), pages 1-18, July.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:14:p:5515-:d:1198697
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    References listed on IDEAS

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    1. Hajar Doubabi & Issam Salhi & Najib Essounbouli, 2022. "A Novel Control Technique for Voltage Balancing in Bipolar DC Microgrids," Energies, MDPI, vol. 15(9), pages 1-14, May.
    2. Khaizaran Abdulhussein Al Sumarmad & Nasri Sulaiman & Noor Izzri Abdul Wahab & Hashim Hizam, 2022. "Energy Management and Voltage Control in Microgrids Using Artificial Neural Networks, PID, and Fuzzy Logic Controllers," Energies, MDPI, vol. 15(1), pages 1-22, January.
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