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A Study on Neutral-Point Potential in Three-Level NPC Converters

Author

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  • Maosong Zhang

    (School of Electrical Engineering and Automation, Anhui University, Hefei 230601, China
    Collaborative Innovation Center of Industrial Energy-Saving and Power Quality Control, Anhui University, Hefei 230601, China)

  • Ying Cui

    (School of Electrical Engineering and Automation, Anhui University, Hefei 230601, China
    Collaborative Innovation Center of Industrial Energy-Saving and Power Quality Control, Anhui University, Hefei 230601, China)

  • Qunjing Wang

    (School of Electrical Engineering and Automation, Anhui University, Hefei 230601, China
    Engineering Research Center of Power Quality, Ministry of Education, Anhui University, Hefei 230601, China)

  • Jun Tao

    (School of Electrical Engineering and Automation, Anhui University, Hefei 230601, China)

  • Xiuqin Wang

    (School of Electrical Engineering and Automation, Anhui University, Hefei 230601, China
    Collaborative Innovation Center of Industrial Energy-Saving and Power Quality Control, Anhui University, Hefei 230601, China)

  • Hongsheng Zhao

    (State Grid Hubei Electric Power Company Limited Economic Research Institute, Wuhan 430077, China)

  • Guoli Li

    (School of Electrical Engineering and Automation, Anhui University, Hefei 230601, China
    Engineering Research Center of Power Quality, Ministry of Education, Anhui University, Hefei 230601, China)

Abstract

This paper proposes an accurate mathematical model of three-level neutral-point-clamped (NPC) converters that can accurately represent the midpoint potential drift of the DC link with parameter perturbation. The mathematical relationships between the fluctuation in neutral-point voltage, the parametric perturbation, and the capacitance error are obtained as mathematical expressions in this model. The expressions can be used to quantitatively analyze the reason for the neutral-point voltage imbalance and balancing effect based on a zero-sequence voltage injection. The injected zero-sequence voltage, which can be used to balance the DC-side voltages with the combined action of active current, can be easily obtained from the proposed model. A balancing control under four-quadrant operation modes is proposed by considering the active current to verify the effectiveness of this model. Both the simulation and experiment results validate the excellent performance of the proposed model compared to the conventional model.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:17:p:3367-:d:262957
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    References listed on IDEAS

    as
    1. Hyo-Chul In & Seok-Min Kim & Kyo-Beum Lee, 2018. "Design and Control of Small DC-Link Capacitor-Based Three-Level Inverter with Neutral-Point Voltage Balancing," Energies, MDPI, vol. 11(6), pages 1-18, June.
    2. Yungdeug Son & Jangmok Kim, 2018. "A Novel Phase Current Reconstruction Method for a Three-Level Neutral Point Clamped Inverter (NPCI) with a Neutral Shunt Resistor," Energies, MDPI, vol. 11(10), pages 1-18, October.
    3. 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.
    4. 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.
    5. Ming Wu & Zhenhao Song & Zhipeng Lv & Kai Zhou & Qi Cui, 2019. "A Method for the Simultaneous Suppression of DC Capacitor Fluctuations and Common-Mode Voltage in a Five-Level NPC/H Bridge Inverter," Energies, MDPI, vol. 12(5), pages 1-14, February.
    6. Shi Weng Gui & Zhen Jun Lin & Sheng Hua Huang, 2015. "A Varied VSVM Strategy for Balancing the Neutral-Point Voltage of DC-Link Capacitors in Three-Level NPC Converters," Energies, MDPI, vol. 8(3), pages 1-16, March.
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    Cited by:

    1. Weixuan Zhang & Yu Fang & Rong Ye & Zhengqun Wang, 2020. "Analysis and Design of a Double Fuzzy PI Controller of a Voltage Outer Loop in a Reversible Three-Phase PWM Converter," Energies, MDPI, vol. 13(15), pages 1-19, July.
    2. Sebastian Berhausen & Tomasz Jarek & Petr Orság, 2022. "Influence of the Shielding Winding on the Bearing Voltage in a Permanent Magnet Synchronous Machine," Energies, MDPI, vol. 15(21), pages 1-19, October.

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