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Energies 2015, 8(9), 9670-9687; doi:10.3390/en8099670

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

1
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
2
College of Information Science and Engineering, Fujian University of Technology, Fuzhou 350118, Fujian, China
3
National Key Laboratory for Vessel Integrated Power System Technology, Wuhan 430205, Hubei, China
4
School of Electrical Engineering, Zhejiang University, Hangzhou 310058, Zhejiang, China
*
Author to whom correspondence should be addressed.
Academic Editor: Paul Stewart
Received: 20 June 2015 / Revised: 17 August 2015 / Accepted: 19 August 2015 / Published: 8 September 2015
View Full-Text   |   Download PDF [2460 KB, uploaded 8 September 2015]   |  

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. View Full-Text
Keywords: cascaded H-bridge multilevel (CHBML) inverter; particle swarm optimization; phase-shifted carrier pulse width modulation (PSCPWM); unequal dc voltages cascaded H-bridge multilevel (CHBML) inverter; particle swarm optimization; phase-shifted carrier pulse width modulation (PSCPWM); unequal dc voltages
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Cai, X.-J.; Wu, Z.-X.; Li, Q.-F.; Wang, S.-X. Phase-Shifted Carrier Pulse Width Modulation Based on Particle Swarm Optimization for Cascaded H-bridge Multilevel Inverters with Unequal DC Voltages. Energies 2015, 8, 9670-9687.

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