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Voltage Jump Suppression and Capacitor Voltage Fluctuation Analysis for a Four-Level Hybrid Flying Capacitor T-Type Converter

Author

Listed:
  • Chen Wei

    (School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China
    Department of Electrical and Electronic Engineering, University of Bristol, Bristol BS8 1TH, UK)

  • Xibo Yuan

    (School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China
    Department of Electrical and Electronic Engineering, University of Bristol, Bristol BS8 1TH, UK)

  • Juan Zhou

    (School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Kangan Wang

    (School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Yonglei Zhang

    (School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Xiaojie Wu

    (School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

In low and medium voltage power conversion systems, multilevel converters are becoming more and more attractive due to improved power density. However, the complexity of topology and control is a big challenge for the application of multilevel converters. In this paper, a four-level (4L) hybrid flying capacitor (FC) T-type converter has been researched in detail. The topological advantage of the converter is displayed in comparison to existing four-level converters. According to the feature of the topology, the operating status has been analyzed and the reason for the voltage jump is researched in detail during the dead-time period. A strategy to reduce voltage jump by adjusting the switching states has be presented. The FC voltages can be balanced by selecting the appropriate switching states. The relationships between the fluctuations of FC voltages and the modulation index and power factor (PF) have been analyzed by simulation results. The performance of the 4L converter has been investigated in MATLAB/Simulink as well as on a down-scaled laboratory prototype.

Suggested Citation

  • Chen Wei & Xibo Yuan & Juan Zhou & Kangan Wang & Yonglei Zhang & Xiaojie Wu, 2019. "Voltage Jump Suppression and Capacitor Voltage Fluctuation Analysis for a Four-Level Hybrid Flying Capacitor T-Type Converter," Energies, MDPI, vol. 12(4), pages 1-16, February.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:4:p:698-:d:207915
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    References listed on IDEAS

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    1. Daliang Yang & Li Yin & Shengguang Xu & Ning Wu, 2018. "Power and Voltage Control for Single-Phase Cascaded H-Bridge Multilevel Converters under Unbalanced Loads," Energies, MDPI, vol. 11(9), pages 1-18, September.
    2. Zheng Gong & Qi Cui & Xi Zheng & Peng Dai & Rongwu Zhu, 2018. "An Improved Imperialist Competitive Algorithm to Solve the Selected Harmonic Elimination Pulse-Width Modulation in Multilevel Converters," Energies, MDPI, vol. 11(11), pages 1-16, November.
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    Cited by:

    1. Chen Wei & Xibo Yuan & Yonglei Zhang & Xiaojie Wu, 2020. "A Generic Multi-Level SVM Scheme Based on Two-Level SVM for n -Level Converters," Energies, MDPI, vol. 13(9), pages 1-18, April.

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