HYBRID MODULATION SCHEME FOR CASCADED H-BRIDGE INVERTER CELLS

Authors

  • CI Odeh E.ON ENERGY RES. CENTER, INST. FOR POWER GENERATION AND STORAGE SYSTEMS, RWTH AACHEN UNIV., GERMANY

DOI:

https://doi.org/10.4314/njt.341.909

Keywords:

Cascade H-Bridge, multilevel, PWM, H-bridge

Abstract

This work proposes a switching technique for cascaded H-Bridge (CHB) cells. Single carrier Sinusoidal PWM (SCSPWM) scheme is employed in the generation of the gating signals. A sequential switching and base PWM circulation schemes are presented for this fundamental cascaded multilevel inverter topology. With these proposed concepts, it is now possible to generate equal average switching signal patterns in all the constituting power semiconductor switches. This results in equal switching loss dissipation and equal power sharing in CHB multilevel inverter modules; and therefore technically modularizes the cascaded system. A 4-cell cascaded structure has been used to exemplify the proposed switching technique. Outlines with switching functions are given for the proposed modulation strategy. For a modulation index of 0.9, a THD value of 14.62% has been achieved in the output voltage waveform of the exemplanary 4-cell cascaded configuration. Verification of the performance of the proposed control technique is done through simulations and experiments.

 

http://dx.doi.org/10.4314/njt.v34i1.24

Downloads

Issue

Section

Computer, Telecommunications, Software, Electrical & Electronics Engineering

How to Cite

HYBRID MODULATION SCHEME FOR CASCADED H-BRIDGE INVERTER CELLS. (2014). Nigerian Journal of Technology, 34(1), 193-202. https://doi.org/10.4314/njt.341.909

Most read articles by the same author(s)

1 2 > >>