Download This PaperComparative Analysis of Multi-carrier PWM Methodologies for 3-Phase 9-Level Cascade Inverter
9 Pages Posted: 15 Apr 2020
Date Written: April 14, 2020
Abstract
This work puts forth the comparative analysis of multi-carrier pulse width modulation (PWM) methodologies for 9-level cascaded H-bridge inverter. Multilevel inverters (MLIs) have many advantages over traditional inverters, especially for high power applications. The cascade-connected H-bridge multilevel inverters use capacitors and devices, requiring fewer components per level. Different sinusoidal PWM technologies are used to generate correlation pulses which control the converter switching. The simulation results show the relative performance of different multi-carrier PWM techniques in respect of output voltage waveforms. From the results, it is observed that in phase disposition (IPD) technique provides better performance and produces a substantially sinusoidal output voltage waveform vis-à-vis phase opposite disposition (POD) and alternate phase opposite disposition (APOD) techniques. Further, the total harmonic distortion (THD) is also reduced significantly and effective responses are obtained under varying modulation index.
Keywords: multilevel cascaded inverter, multi-carrier PWM techniques, total harmonic distortion and modulation index
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