Journal
ENERGIES
Volume 8, Issue 9, Pages 9670-9687Publisher
MDPI
DOI: 10.3390/en8099670
Keywords
cascaded H-bridge multilevel (CHBML) inverter; particle swarm optimization; phase-shifted carrier pulse width modulation (PSCPWM); unequal dc voltages
Categories
Funding
- National Natural Science Foundation of China [51277178]
- National High Technology Research and Development Program (863 Program) of China [2013AA-050404]
- Program for New Century Excellent Talents in University of Ministry of Education of China [NECT-11-0871]
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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.
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