On PWM Strategies and Current THD for Single- and Three-Phase Cascade H-Bridge Inverters with Non-Equal DC Sources

Zhansen Akhmetov, Manel Hammami, Gabriele Grandi and Alex Ruderman
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Zhansen Akhmetov: Department of Electrical and Computer Engineering, Nazarbayev University, 010000 Astana, Kazakhstan
Manel Hammami: Department of Electrical, Electronic, and Information Engineering, Univ. of Bologna, 40136 Bologna, Italy
Gabriele Grandi: Department of Electrical, Electronic, and Information Engineering, Univ. of Bologna, 40136 Bologna, Italy
Alex Ruderman: Department of Electrical and Computer Engineering, Nazarbayev University, 010000 Astana, Kazakhstan

Energies, 2019, vol. 12, issue 3, 1-17

Abstract: Cascade H-bridge (CHB) inverter is an attractive choice for integration of DC sources of different nature, e.g., for distributed generation with energy storage, photovoltaic generation, etc. In general, non-equal DC voltage sources can affect the total harmonic distortion (THD) of the CHB by introducing undesirable low-frequency subharmonics. This paper investigates different level-shifted (LS) and phase-shifted (PS) pulse width modulation (PWM) strategies for single- and three-phase cascade H-bridge inverters with non-equal DC sources from the load current THD minimization perspective. The best current quality is provided by LS PWM, as reported in the literature. The paper provides a simple time domain explanation of LS PWM superiority. However, PS PWM may be a preferable choice for practical applications due to fair power and loss sharing across individual H-bridges. The paper explains how to obtain the best current quality by PS PWM carriers’ order arrangement (DC sources switching sequence selection).

Keywords: multilevel inverters; total harmonic distortion; level-shifted PWM; phase-shifted PWM (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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