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Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation

Author

Listed:
  • Lingling Cao

    (School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen 518055, China)

  • Jiefeng Lin

    (School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen 518055, China)

  • Shikai Chen

    (School of Automation, Guangdong University of Technology, Guangzhou 510006, China)

  • Yuanmao Ye

    (School of Automation, Guangdong University of Technology, Guangzhou 510006, China)

Abstract

Multilevel inverters have been widely used in various industrial applications such as renewable energy generation and electric vehicles. An improved circuit of symmetrical cascaded switched-capacitor multilevel inverter is proposed so that the reactive power is absorbed by its power supply instead of capacitors. Then, a special hybrid pulse width modulation strategy combing level-shifted pulse width modulation (LS-PWM) and phase-shifted pulse width modulation (PS-PWM) was developed for the inverter. With this modulation algorithm, the power between cascaded units is automatically balanced, and the voltage of the capacitor in each unit is also automatically balanced to the dc input voltage. In addition, the optimized capacitor voltage ripple makes it possible to use a smaller capacitor to produce a better output voltage waveform. Theoretical analysis, simulation and experimental results show that the equivalent switching frequency of the cascaded multilevel inverter is twice the original frequency so that the output voltage harmonics are only distributed near even multiples of the carrier frequency.

Suggested Citation

  • Lingling Cao & Jiefeng Lin & Shikai Chen & Yuanmao Ye, 2021. "Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation," Energies, MDPI, vol. 14(22), pages 1-15, November.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:22:p:7643-:d:679794
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    References listed on IDEAS

    as
    1. 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.
    2. Hao Qiang & Zhenyu Wu & Tian Xu & Pengcheng Kong & Shuren Mao & Jianfeng Zheng, 2021. "Boost Voltage Single Phase Full Bridge Inverter with No Voltage Drop Based on Switched Capacitor," Energies, MDPI, vol. 14(12), pages 1-18, June.
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    Cited by:

    1. Vishal Anand & Varsha Singh & M. Jagabar Sathik & Dhafer Almakhles, 2022. "A Generalized Switched-Capacitor Multilevel Inverter Topology with Voltage Boosting Ability and Reduced Inrush Current," Energies, MDPI, vol. 15(23), pages 1-14, December.
    2. Shaik Nyamathulla & Dhanamjayulu Chittathuru, 2023. "A Review of Multilevel Inverter Topologies for Grid-Connected Sustainable Solar Photovoltaic Systems," Sustainability, MDPI, vol. 15(18), pages 1-44, September.

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