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Phase-Shifted Carrier Pulse Width Modulation Based on Particle Swarm Optimization for Cascaded H-bridge Multilevel Inverters with Unequal DC Voltages

Author

Listed:
  • Xin-Jian Cai

    (State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China
    College of Information Science and Engineering, Fujian University of Technology, Fuzhou 350118, Fujian, China
    National Key Laboratory for Vessel Integrated Power System Technology, Wuhan 430205, Hubei, China)

  • Zhen-Xing Wu

    (National Key Laboratory for Vessel Integrated Power System Technology, Wuhan 430205, Hubei, China)

  • Quan-Feng Li

    (School of Electrical Engineering, Zhejiang University, Hangzhou 310058, Zhejiang, China)

  • Shu-Xiu Wang

    (National Key Laboratory for Vessel Integrated Power System Technology, Wuhan 430205, Hubei, China)

Abstract

High-voltage cascaded H-bridge multilevel (CHBML) inverters usually include many isolated dc voltage sources. Some dc source faults result in a drop in the dc voltage, thereby leading to unequal cell dc voltages. On the other hand, the differences in cell dc source parameters result in unequal dc voltages too. At present, riding through the faults of dc sources and operating under the condition of unequal dc voltages are required to improve the reliability of CHBML inverters. Unfortunately, the conventional phase-shifted carrier pulse width modulation (PSCPWM), which is widely used for CHBML inverters, cannot eliminate low-frequency sideband harmonics when cell dc voltages are not equal. This paper analyzes the principle of sideband harmonic elimination, and proposes an improved PSCPWM based on the particle swarm optimization algorithm. This modulation technique eliminates low-frequency sideband harmonics by calculating and regulating the carrier phases according to different cell dc voltages. The proposed PSCPWM enhances the reliability of the CHBML inverter and extends the range of its application. Simulation and experimental results obtained from the prototype of the CHBML inverter verify the theoretical analysis and the achievements made in this paper.

Suggested Citation

  • Xin-Jian Cai & Zhen-Xing Wu & Quan-Feng Li & Shu-Xiu Wang, 2015. "Phase-Shifted Carrier Pulse Width Modulation Based on Particle Swarm Optimization for Cascaded H-bridge Multilevel Inverters with Unequal DC Voltages," Energies, MDPI, vol. 8(9), pages 1-18, September.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:9:p:9670-9687:d:55400
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    Citations

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    Cited by:

    1. Xiongmin Tang & Junhui Zhang & Zheng Liu & Miao Zhang, 2017. "A Switching Frequency Optimized Space Vector Pulse Width Modulation (SVPWM) Scheme for Cascaded Multilevel Inverters," Energies, MDPI, vol. 10(5), pages 1-18, May.
    2. Luyun Jiao & Dongyuan Qiu & Bo Zhang & Yanfeng Chen, 2019. "A Hybrid Nine-Arm High-Voltage Inverter with DC-Fault Blocking Capability," Energies, MDPI, vol. 12(20), pages 1-15, October.
    3. Xiongmin Tang & Chengjing Lai & Zheng Liu & Miao Zhang, 2017. "A SVPWM to Eliminate Common-Mode Voltage for Multilevel Inverters," Energies, MDPI, vol. 10(5), pages 1-10, May.
    4. Borzou Yousefi & Soodabeh Soleymani & Babak Mozafari & Seid Asghar Gholamian, 2017. "Speed Control of Matrix Converter-Fed Five-Phase Permanent Magnet Synchronous Motors under Unbalanced Voltages," Energies, MDPI, vol. 10(10), pages 1-21, September.

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