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Novel Single-Phase Grid-Tied NPC Five-Level Converter with an Inherent DC-Link Voltage Balancing Strategy for Power Quality Improvement

Author

Listed:
  • Jorge Lara

    (División de Estudios de Posgrado e Investigación, TNM Instituto Tecnológico de La Laguna, Torreón 27000, Mexico)

  • Lesedi Masisi

    (School of Electrical and Information Engineering, University of the Witwatersrand, Johannesburg 2000, South Africa)

  • Concepcion Hernandez

    (División de Estudios de Posgrado e Investigación, TNM Instituto Tecnológico de La Laguna, Torreón 27000, Mexico)

  • Marco A. Arjona

    (División de Estudios de Posgrado e Investigación, TNM Instituto Tecnológico de La Laguna, Torreón 27000, Mexico)

  • Ambrish Chandra

    (Department of Electrical Engineering, École de Technologie Supérieure (ÉTS), Montreal, QC H3C 1K3, Canada)

Abstract

This paper presents a novel single-phase grid-tied neutral-point-clamped (NPC) five-level converter (SPFLC). Unlike the literature on five-level NPC topologies, the proposed one is capable of inherently balancing the voltage of the DC-link split capacitors. For this purpose, a simple Multicarrier Phase Disposition (MPD) Pulse Width Modulation (PWM) technique is used, thus avoiding both complex modifications to the Space Vector Modulation (SVM) and offset voltage injections into the carrier based (CB) PWM, as commonly done in most conventional balancing algorithms. Bearing in mind that the proposed balancing strategy only requires measuring the capacitors’ voltages and the sign of the converter output current, it has a very low complexity. The developed strategy is not only straightforwardly implemented but is also very effective for obtaining symmetrical and undistorted voltage levels from the proposed multilevel converter, as well as for significantly improving the power quality of the SPFLC output voltage and, in turn, of the grid current. The simulation results obtained with MATLAB-SimPowerSystems as well as the experimental results obtained with the prototype built in the laboratory validate the topology of the proposed NPC five-level converter and the voltage balancing strategy, by showing a good performance under step-changes and exhaustive operating test conditions.

Suggested Citation

  • Jorge Lara & Lesedi Masisi & Concepcion Hernandez & Marco A. Arjona & Ambrish Chandra, 2021. "Novel Single-Phase Grid-Tied NPC Five-Level Converter with an Inherent DC-Link Voltage Balancing Strategy for Power Quality Improvement," Energies, MDPI, vol. 14(9), pages 1-22, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:9:p:2644-:d:549052
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    References listed on IDEAS

    as
    1. Kyoung-Pil Kang & Younghoon Cho & Myung-Hyo Ryu & Ju-Won Baek, 2018. "A Harmonic Voltage Injection Based DC-Link Imbalance Compensation Technique for Single-Phase Three-Level Neutral-Point-Clamped (NPC) Inverters," Energies, MDPI, vol. 11(7), pages 1-15, July.
    2. Tao Zhou & Zeliang Shu & Hongjian Lin & Deng Luo & Yajun Chen & Xiaoxiao Guo, 2017. "A High-Power-Density Single-Phase Rectifier Based on Three-Level Neutral-Point Clamped Circuits," Energies, MDPI, vol. 10(5), pages 1-11, May.
    3. Jae-Myeong Kim & Geum-Seop Song & Jae-Jung Jung, 2021. "Zero-Sequence Voltage Injection Method for DC Capacitor Voltage Balancing of Wye-Connected CHB Converter under Unbalanced Grid and Load Conditions," Energies, MDPI, vol. 14(4), pages 1-18, February.
    4. Eun-Su Jun & Sangshin Kwak, 2018. "A Highly Efficient Single-Phase Three-Level Neutral Point Clamped (NPC) Converter Based on Predictive Control with Reduced Number of Commutations," Energies, MDPI, vol. 11(12), pages 1-28, December.
    5. Roberto Zanasi & Davide Tebaldi, 2021. "Modeling Control and Robustness Assessment of Multilevel Flying-Capacitor Converters," Energies, MDPI, vol. 14(7), pages 1-40, March.
    6. Xiaoqiong He & Xiaolan Lin & Xu Peng & Pengcheng Han & Zeliang Shu & Shibin Gao, 2017. "Control Strategy of Single-Phase Three Level Neutral Point Clamped Cascaded Rectifier," Energies, MDPI, vol. 10(5), pages 1-16, April.
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    Cited by:

    1. Lingling Cao & Jiefeng Lin & Shikai Chen & Yuanmao Ye, 2021. "Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation," Energies, MDPI, vol. 14(22), pages 1-15, November.
    2. Jagabar Sathik & Shady H. E. Abdel Aleem & Rasoul Shalchi Alishah & Dhafer Almakhles & Kent Bertilsson & Mahajan Sagar Bhaskar & George Fernandez Savier & Karthikeyan Dhandapani, 2021. "A Multilevel Inverter Topology Using Diode Half-Bridge Circuit with Reduced Power Component," Energies, MDPI, vol. 14(21), pages 1-21, November.

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