Analytical current THD evaluation for three‐phase voltage source inverters

Zhansen Akhmetov, Alex Ruderman

2020

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DOI 10.1049/iet-pel.2019.1257

Data confidence 70 medium

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Abstract

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.