Comparative Study of Switching Techniques Performance for Cascaded H-bridge Multilevel Inverters
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Abstract
Phase-shifted and level-shifted switching methods are commonly employed in cascaded H-bridge multilevel inverters. The level-shifted method can also be classified into 3 types, i.e., IPD, APOD, and POD, based on the arrangement of the carrier waveforms. However, each switching method might provide different levels of output voltage and total harmonic distortion, especially in the case of modulation index is modified. Therefore, those switching methods based on SVPWM are investigated and compared in this paper. The effectiveness of switching methods for multilevel inverters is clearly demonstrated by simulation.
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