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An Improved Overmodulation Strategy for a Three-Level NPC Inverter Considering Neutral-Point Voltage Balance and Common-Mode Voltage Suppression

Author

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  • Zhixun Ma

    (National Maglev Transportation Engineering R&D Center, Tongji University, Shanghai 201804, China
    Key Laboratory of Control of Power Transmission and Conversion (SJTU), Ministry of Education, Shanghai 200240, China
    Key Laboratory of Road and Traffic Engineering of the State Ministry of Education, Shanghai 201804, China)

  • Haichuan Niu

    (National Maglev Transportation Engineering R&D Center, Tongji University, Shanghai 201804, China
    Key Laboratory of Road and Traffic Engineering of the State Ministry of Education, Shanghai 201804, China
    College of Transportation Engineering, Tongji University, Shanghai 201804, China)

  • Xiang Wu

    (School of Electrical Engineering, China University of Mining and Technology, Xuzhou 221008, China)

  • Xu Zhang

    (National Maglev Transportation Engineering R&D Center, Tongji University, Shanghai 201804, China)

  • Guobin Lin

    (National Maglev Transportation Engineering R&D Center, Tongji University, Shanghai 201804, China)

Abstract

The three-level neutral-point clamped voltage source inverter (3L-NPC-VSI) is widely used in the maglev traction systems due to its high output voltage, large output capacity and low output current harmonics. In order to improve the utilization of the DC-bus voltage, an overmodulation strategy is necessary. This paper proposes an improved overmodulation strategy based on the minimum amplitude error method for a 3L-NPC-VSI. Compared with the conventional overmodulation strategy based on the minimum amplitude error method, the utilization of the DC-bus voltage is higher. Meanwhile, a virtual space vector modulation strategy is adopted for inverter neutral-point (NP) voltage balance and common-mode voltage (CMV) suppression. Furthermore, the suppression of leakage current also has been verified. Furthermore, the implementation details of the proposed overmodulation strategy based on minimum amplitude error method is elaborated. The effectiveness of the proposed method is verified by simulation and experimental results.

Suggested Citation

  • Zhixun Ma & Haichuan Niu & Xiang Wu & Xu Zhang & Guobin Lin, 2022. "An Improved Overmodulation Strategy for a Three-Level NPC Inverter Considering Neutral-Point Voltage Balance and Common-Mode Voltage Suppression," Sustainability, MDPI, vol. 14(19), pages 1-16, October.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:19:p:12558-:d:932049
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    References listed on IDEAS

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    1. Hossein Khoun Jahan & Reyhaneh Eskandari & Tohid Rahimi & Rasoul Shalchi Alishah & Lei Ding & Kent Bertilsson & Mehran Sabahi & Frede Blaabjerg, 2021. "A Limited Common-Mode Current Switched-Capacitor Multilevel Inverter Topology and Its Performance and Lifetime Evaluation in Grid-Connected Photovoltaic Applications," Energies, MDPI, vol. 14(7), pages 1-18, March.
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    Cited by:

    1. Matías Garbarino & Jaime Rohten & Rodrigo Morales & José Espinoza & Javier Muñoz & José Silva & David Dewar, 2023. "Extended Operating Region Algorithm for PV Array Connected to Microgrids for Wide Frequency and Amplitude Variations," Energies, MDPI, vol. 16(7), pages 1-22, March.

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