Losses Comparison Among Carrier-Based PWM Modulation Strategies in Three-Level Neutral-Point-Clamped Inverter
DOI:
https://doi.org/10.24084/repqj09.537Abstract
This paper investigates the power losses in semiconductors for a three-phase, three level neutral point clamped (3L-NPC) inverter. Analytical expressions for the switching and conductor losses are derived. Three different modulation strategies are analyzed: sinusoidal modulation (SPWM); sine modulation with injection of the third harmonic (THIPWM); carrier based space vector modulation (CB-SVMPWM). Based on these strategies, the inverter losses are estimated through computational simulation under different operating conditions. The influence of these strategies on the losses is also analyzed.