การศึกษาเปรียบเทียบสมรรถนะของวิธีการสวิตช์สำหรับอินเวอร์เตอร์หลายระดับชนิดคาดเคสเฮชบริดจ์

Comparative Study of Switching Techniques Performance for Cascaded H-bridge Multilevel Inverters

อดิศร จิวสืบพงษ์, ณัฐพงษ์ โปธิ และ เชวศักดิ์ รักเป็นไทย

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.

Keywords: Multilevel inverter, Switching techniques, Cascaded H-bridges