Minimization of voltage and current total harmonic distortion for a single-phase multilevel inverter staircase modulation

Kenessary Koishybay, Yakov L. Familiant, Alex Ruderman

Research output: Chapter in Book/Report/Conference proceedingConference contribution

14 Citations (Scopus)

Abstract

The paper addresses optimal voltage and current quality (minimal Total Harmonic Distortion - THD) for a singlephase multilevel inverter staircase modulation. The previous research mostly addressed optimal THD problem in frequency domain accounting for a limited harmonics count. The novelty of this research is that voltage and current minimal THD problems are formulated in time domain as a constrained optimization ones in order to find theoretically optimal switching angles accounting for all switching harmonics. The optimal switching angles and respective minimal THD values are obtained for different inverter level counts and the whole fundamental voltage (modulation index) range. Suggested are smooth ripple-free approximations for accurate voltage and current THD for arbitrary level counts and modulation indices. While these simple hyperbolic formulas accurately approximate the average trend, local maxima and minima of voltage and current THD may be considered on separate. In fact, the obtained current THD is frequency weighted THD that assumes inductance dominated RL-load. For grid-connected applications, normalized current fundamental harmonic is smaller than voltage modulation index and current THD is essentially larger than frequency weighted voltage one.

Original languageEnglish
Title of host publication9th International Conference on Power Electronics - ECCE Asia: "Green World with Power Electronics", ICPE 2015-ECCE Asia
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1203-1208
Number of pages6
ISBN (Print)9788957082546
DOIs
Publication statusPublished - Jul 27 2015
Event9th International Conference on Power Electronics - ECCE Asia, ICPE 2015-ECCE Asia - Seoul, Korea, Republic of
Duration: Jun 1 2015Jun 5 2015

Other

Other9th International Conference on Power Electronics - ECCE Asia, ICPE 2015-ECCE Asia
CountryKorea, Republic of
CitySeoul
Period6/1/156/5/15

Keywords

  • grid-connected applications
  • multilevel inverter
  • staircase modulation
  • switching angles
  • total harmonic distortion

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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    Koishybay, K., Familiant, Y. L., & Ruderman, A. (2015). Minimization of voltage and current total harmonic distortion for a single-phase multilevel inverter staircase modulation. In 9th International Conference on Power Electronics - ECCE Asia: "Green World with Power Electronics", ICPE 2015-ECCE Asia (pp. 1203-1208). [7167933] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICPE.2015.7167933