Analytical current THD evaluation for threephase voltage source inverters

Zhansen Akhmetov, Alex Ruderman

Research output: Contribution to journalArticlepeer-review


This study addresses the calculation of current total harmonic distortion (THD) for three-phase (3P) pulse-width modulation (PWM) inverters. First, it demonstrates how an analytical approach to PWM current ripple normalised mean square (NMS) calculation introduced in the late 1980s for a two-level (2L) inverter can be used for current THD evaluation. Second, it is shown how to evaluate current THD for a three-level (3L) 3P inverter using the current ripple NMS concept. Though considered is a 3P cascaded inverter with one H-bridge per phase, the results are applicable to popular 3L neutral point clamped (T-type) and flying capacitor inverters.

Original languageEnglish
Pages (from-to)1286-1289
Number of pages4
JournalIET Power Electronics
Issue number6
Publication statusPublished - May 6 2020

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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