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Zero-Sequence Voltage Injection Method for DC Capacitor Voltage Balancing of Wye-Connected CHB Converter under Unbalanced Grid and Load Conditions

Author

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  • Jae-Myeong Kim

    (School of Electronic and Electrical Engineering, IT College, Kyungpook National University, Daegu 41566, Republic of Korea)

  • Geum-Seop Song

    (School of Electronic and Electrical Engineering, IT College, Kyungpook National University, Daegu 41566, Republic of Korea)

  • Jae-Jung Jung

    (School of Electronic and Electrical Engineering, IT College, Kyungpook National University, Daegu 41566, Republic of Korea)

Abstract

Leg capacitor energy balancing control is one of the crucial issues for stable operation of a cascaded H-bridge (CHB) converter. Because this topology inherently consists of numerous submodule cells with DC capacitors, the cell voltages and leg capacitor energy instantaneously fluctuate depending on operation sequence of the CHB converter. In general, a wye-connected CHB-converter-based static synchronous compensator (STATCOM) utilizes a zero-sequence voltage component for leg capacitor energy balancing. In this paper, to improve the dynamics of leg energy balancing control, a feedforward calculation method of the zero-sequence voltage injection is proposed. The feedforward term can be instantaneously calculated by using the information from the measured leg voltages and leg currents, and the method ensures successful regulation of the leg energy balance even under unbalanced grid and load conditions. Moreover, the verification of the proposed method is supported by the mathematical vector theorems. A 50MVA full-scale wye-connected CHB–STATCOM system simulation was performed to verify the proposed feedforward calculation method considering unbalanced grid as well as unbalanced load conditions.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:4:p:1019-:d:499912
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    References listed on IDEAS

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    1. Ana Rodríguez & Emilio J. Bueno & Álvar Mayor & Francisco J. Rodríguez & Aurelio García-Cerrada, 2014. "Voltage Support Provided by STATCOM in Unbalanced Power Systems," Energies, MDPI, vol. 7(2), pages 1-24, February.
    2. Fernando Martinez-Rodrigo & Dionisio Ramirez & Alexis B. Rey-Boue & Santiago De Pablo & Luis Carlos Herrero-de Lucas, 2017. "Modular Multilevel Converters: Control and Applications," Energies, MDPI, vol. 10(11), pages 1-26, October.
    3. 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. Mohammad Alathamneh & Haneen Ghanayem & Xingyu Yang & R. M. Nelms, 2022. "Three-Phase Grid-Connected Inverter Power Control under Unbalanced Grid Conditions Using a Time-Domain Symmetrical Components Extraction Method," Energies, MDPI, vol. 15(19), pages 1-16, September.
    2. Mohammad Alathamneh & Haneen Ghanayem & Xingyu Yang & R. M. Nelms, 2022. "Three-Phase Grid-Connected Inverter Power Control under Unbalanced Grid Conditions Using a Proportional-Resonant Control Method," Energies, MDPI, vol. 15(19), pages 1-17, September.
    3. Mohammad Alathamneh & Haneen Ghanayem & R. M. Nelms, 2022. "Bidirectional Power Control for a Three-Phase Grid-Connected Inverter under Unbalanced Grid Conditions Using a Proportional-Resonant and a Modified Time-Domain Symmetrical Components Extraction Method," Energies, MDPI, vol. 15(24), pages 1-23, December.
    4. 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.

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