Open AccessModulation Index Effect on the 5-Level SHE-PWM Voltage Source Inverter
Author(s) -
H. Farahani,
H. Sarabadani
Publication year - 2011
Publication title -
engineering
Language(s) - English
Resource type - Journals
eISSN - 1947-3931
pISSN - 1947-394X
DOI - 10.4236/eng.2011.32022
Subject(s) - modulation index , total harmonic distortion , pulse width modulation , inverter , harmonics , voltage , modulation (music) , harmonic , control theory (sociology) , voltage source , electronic engineering , computer science , engineering , physics , electrical engineering , acoustics , control (management) , artificial intelligence
Harmonic content of the voltage source inverters is important and must be in the allowed ranges. Different method are proposed to decrease the Total Harmonic Distortion (THD) and caused to be sinusoidal the output voltage of inverters. One of these methods is using multilevel structure. In this structure many important parameters which are effective on voltage source inverter operation that among them we can mention to modulation index (MI). Variation of modulation index can change the THD. One of the harmonic reduction methods is using multilevel structure. In this paper, a sample 5-level SHE-PWM voltage source inverter is presented and all equation and choosing switching angles for elimination desired harmonics from different order. To investigate the effective parameters on the inverter operation, a typical 5-level inverter is simulated in PSPICE software. The simulation has been done for different values of modulation and its effect on the inverter operation is evaluated