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Compensation-Voltage-Injection-Based Neutral-Point Voltage Fluctuation Suppression Method for NPC Converters

Author

Listed:
  • Guo Chen

    (School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

  • Chunyang Gong

    (Collage of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China)

  • Jun Bao

    (Shanghai Xilong Technology Co., Ltd., Shanghai 201109, China)

  • Lihua Zhu

    (Shanghai Chint Power Systems Co., Ltd., Shanghai 201614, China)

  • Zhixin Wang

    (School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

Abstract

Three-level neutral-point clamped (NPC) inverters are widely used in the new energy power generation, motor drive, and many other occasions. However, the neutral-point voltage imbalance of an NPC inverter will affect the output of the inverter system, and the control of the neutral point voltage has become a popular research topic. In this paper, a compensation-voltage-injection-based neutral-point voltage balancing method is proposed. During the switching cycle, the average value model of the neutral-point current under different voltage vectors is applied to calculate the value of the compensation voltage that needs to be injected. The self-balance of the neutral-point voltage based on a switching cycle is realized, and the influence of modulation ratio and power factor on equalization ability is discussed. A MATLAB/Simulink simulation model and a small power prototype are established to verify the effectiveness of the method, and the simulation and experimental results show that the proposed method can effectively suppress the neutral-point voltage fluctuation in a wide range of modulation ratios and power factors.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:11:p:4409-:d:1159470
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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. Manel Hammami & Gabriele Rizzoli & Riccardo Mandrioli & Gabriele Grandi, 2018. "Capacitors Voltage Switching Ripple in Three-Phase Three-Level Neutral Point Clamped Inverters with Self-Balancing Carrier-Based Modulation," Energies, MDPI, vol. 11(12), pages 1-20, November.
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