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A Harmonic Voltage Injection Based DC-Link Imbalance Compensation Technique for Single-Phase Three-Level Neutral-Point-Clamped (NPC) Inverters

Author

Listed:
  • Kyoung-Pil Kang

    (Department of Electrical Engineering, Konkuk University, Seoul 05029, Korea)

  • Younghoon Cho

    (Department of Electrical Engineering, Konkuk University, Seoul 05029, Korea)

  • Myung-Hyo Ryu

    (Industry Application Research Laboratory, Korea Electrotechnology Research Institute, Changwon 123456, Korea)

  • Ju-Won Baek

    (Industry Application Research Laboratory, Korea Electrotechnology Research Institute, Changwon 123456, Korea)

Abstract

In three-level neutral-point-clamped (NPC) inverters, the voltage imbalance problem between the upper and lower dc-link capacitors is one of the major concerns. This paper proposed a dc-link capacitor voltage balancing method where a common offset voltage was injected. The offset voltage consists of harmonic components and a voltage difference between the upper and the lower capacitors. Here, both the second-order harmonics and the half-wave of the second-order component were injected to compensate for the unbalanced voltage between the capacitors. In order to show the effectiveness of the proposed voltage injection, the theoretical analyses, simulations, and experimental results are provided. Since the proposed method does not require any hardware modifications, it can be easily adapted. Both the simulations and the experiments validated that the voltage difference of the dc-link could be effectively reduced with the proposed method.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:7:p:1886-:d:158908
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    Citations

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    Cited by:

    1. Guo Chen & Chunyang Gong & Jun Bao & Lihua Zhu & Zhixin Wang, 2023. "Compensation-Voltage-Injection-Based Neutral-Point Voltage Fluctuation Suppression Method for NPC Converters," Energies, MDPI, vol. 16(11), pages 1-20, May.
    2. Guozheng Zhang & Bingxu Wei & Xin Gu & Xinmin Li & Zhanqing Zhou & Wei Chen, 2019. "Sector Subdivision Based SVPWM Strategy of Neutral-Point-Clamped Three-Level Inverter for Current Ripple Reduction," Energies, MDPI, vol. 12(14), pages 1-16, July.
    3. 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.
    4. Maosong Zhang & Ying Cui & Qunjing Wang & Jun Tao & Xiuqin Wang & Hongsheng Zhao & Guoli Li, 2019. "A Study on Neutral-Point Potential in Three-Level NPC Converters," Energies, MDPI, vol. 12(17), pages 1-22, September.

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