SELECTIVE HARMONIC ELIMINATION FOR CASCADED H- BRIDGE MULTILEVEL SINGLE SOURCE INVERTER

Authors

  • G. S. Shehu Department of Electrical Engineering, Ahmadu Bello University, Zaria
  • A. B. Kunya Department of Electrical Engineering, Ahmadu Bello University, Zaria
  • I. H. Shanono Department of Electrical Engineering, Bayero University, Kano
  • A. U. Lawan Department of Electrical Engineering, Hussaini Adamu Polytechnic, Kazaure

Keywords:

H-bridge Multilevel Inverter; Half–Equal-Phase; Harmonic Reduction; Selective Harmonic Elimination.

Abstract

In this paper, cascaded H-bridge multi-level inverter using a single DC source is designed
to eliminate selected harmonics by chopping off the fundamental component at certain pre-
determined switching angles and reduces switching losses. The proposed inverter generates
11-level output voltage with an isolation transformer at high switching frequency. To obtain
the gates switching angles offline, Selective Harmonic Elimination (SHE) technique is
applied to solve the nonlinear transcendental equations. The switching angles are then
arranged using Half–Equal-Phase (HEP) technique to enhance the inverter order
harmonics elimination at chosen modulation index. One of the advantage of the design over
conventional ones is the reduction of the number of switches and gate drivers. Based on the
time-based simulation carried out, it is observed that the proposed SHE based inverter has
the ability to eliminate selected harmonics by chopping off the fundamental output
component thereby obtaining a THD of 0.94%.

Published

2019-06-27

Issue

Vol. 8 No. 1 (2019)

Section

Articles