An Investigation of THD in 5-level NPC Multilevel Inverter Based on Multicarrier PWM Techniques

International Journal of Electrical and Electronics Engineering

© 2017 by SSRG - IJEEE Journal

Volume 4 Issue 8

Year of Publication : 2017

Authors : Pairote Thongprasri

10.14445/23488379/IJEEE-V4I8P104

How to Cite?

Pairote Thongprasri, "An Investigation of THD in 5-level NPC Multilevel Inverter Based on Multicarrier PWM Techniques," SSRG International Journal of Electrical and Electronics Engineering, vol. 4,  no. 8, pp. ):20-28, 2017. Crossref, https://doi.org/10.14445/23488379/IJEEE-V4I8P104

Abstract:

This paper presents an investigation of the Total Harmonic Distortion in 5-level neutral point clamped multilevel inverter using 4 strategies of multicarrier PWM techniques; Phase Disposition, Phase Opposition Disposition, Phase Opposition Disposition with different frequencies, and Alternative Phase Opposition Disposition. The signals of the controlled switches of the multilevel inverter based on 4 strategies of multicarrier PWM techniques created by a TMS320F28335 DSP controller are proposed in this paper. Experimental results by varying the modulation index (ma) in the range of 0.4 to 1, the lowest percentage of the THD of the system is produced when the multilevel inverter is controlled by the PD modulation technique. The %THDv and the %THDi are 9.3 and 9.6,respectively, when the proto-type of the multilevel inverter with a resistive load 50 Ω and an inductive load 8 mH is controlled by the PD modulation technique using ma = 0.9.

Keywords:

Neutral point clamped multilevel inver-ter, Multicarrier PWM techniques, Total harmonic distortion.

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