Simple Time Averaging Current Quality Evaluation of a Single-Phase Multilevel PWM Inverter

Boris Reznikov, Milan Srndovic, Yakov L. Familiant, Gabriele Grandi, Alex Ruderman

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


This paper addresses theoretical calculation of a single-phase multilevel pulsewidth modulation (PWM) inverter current total harmonic distortion (THD). Analytical approach introduced in late 1980s for a two-level inverter is generalized for an arbitrary level count for a single-phase inverter. Although the obtained closed-form piecewise analytical solutions assume (infinitely) large ratio of switching and fundamental frequencies and pure inductive load, they are practically very accurate for the ratios of (apparent) switching and fundamental frequencies larger than 25-30 and inductance-dominated loads. Along with strict mathematical solutions, simple accurate Bessel function approximation and hyperbolic average trend one are suggested. The formulas clearly reveal a single-phase PWM inverter current THD dependence on modulation index for an arbitrary voltage level count and are easily modified to cover grid-connected cases.

Original languageEnglish
Article number7430289
Pages (from-to)3605-3615
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Issue number6
Publication statusPublished - Jun 1 2016


  • DC-AC converter
  • harmonic
  • multilevel converter
  • single-phase systems

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering
  • Computer Science Applications

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