Analytical Approach to THD Formulation and Optimization in Sine-PWM-based Single-Phase Multilevel Inverters with Variable DC Ratios

Eli Barbie, Mor Mordechai Peretz, Alon Kuperman, Dmitry Baimel

Research output: Contribution to journalArticlepeer-review

Abstract

Asymmetric Multilevel Inverters (MLI) with Unequal Voltage Steps (UVS) are often combined with the Staircase Modulation (SCM) technique to improve both voltage and current THD - an approach known as Optimal Minimization of THD (OMTHD). This is usually achieved by varying both the Switching Angles (SA) and the DC source Ratios (DCR), to obtain the desired Modulation Index (MI) while THD is minimized. In this article, a novel Sine-PWM (SPWM) based OMTHD is considered as an alternative to SCM-based OMTHD. Because only the DCRs need to be optimized instead of both SAs and DCRs, the OMTHD process is simplified, while voltage THD, current THD, as well as power efficiency, are improved, especially for the medium-low MI range, compared to conventional SPWM. An analytical formulation of phase-voltage THD for UVS-based SPWM MLIs is derived and utilized for the novel SPWM-based OMTHD. Validation is carried out by theoretical analysis, digital simulations, and real-time C-HIL-based experiments.

Original languageEnglish
Pages (from-to)1
Number of pages1
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
DOIs
StateAccepted/In press - 1 Jan 2022

Keywords

  • Multilevel inverters
  • Multilevel inverters
  • Optimization
  • Optimization
  • Power electronics
  • Pulse width modulation
  • Sine-PWM
  • Switches
  • Topology
  • Total Harmonic Distortion
  • Unequal DC Sources
  • Voltage
  • level-shifted

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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