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

Xin-Jian Cai, Zhen-Xing Wu, Quan-Feng Li and Shu-Xiu Wang
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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
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

Energies, 2015, vol. 8, issue 9, 1-18

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.

Keywords: cascaded H-bridge multilevel (CHBML) inverter; particle swarm optimization; phase-shifted carrier pulse width modulation (PSCPWM); unequal dc voltages (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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