A New Three Phase Multilevel Inverter Topology with Symmetrical and Asymmetrical Algorithms

Authors

  • Suresh Kumar
  • K. Sri Gowri
  • S. Nagaraja Rao
  • B. M. Manjunatha
  • P. Rama Mohan

Abstract

In the multilevel inverters, the complexity of the system will depend on number of switches and control schemes involved during the power conversion process. This article recommends a new three phase multi-level inverter topology with a minimum number of switches for PV system applications. This topology includes three level generating blocks and traditional two level three phase inverter. In each level generating block m-number of proposed basic units are connected in series to generate required number of voltage levels. But level generator will produce only unidirectional voltage levels. Then by connecting traditional three phase inverter we obtain bidirectional voltage levels. The proposed model is best in terms of reduction in power switches and control circuits than traditional topologies published in literature. Due to a smaller number of elements, the overall size of the system is small and installation cost will be less. Additionally, a major factor ‘FP’ is introduced in this paper, where the factor ‘FP’ deals with the switch count required for generating the pole voltage levels. A comparison is done in between present and existing topologies based on this factor. In this script proposed topology is explained for symmetrical algorithm (SA) and asymmetrical algorithms (AA). The output performance of this topology is verified in terms of voltage THD through Matlab/ Simulink model.

Downloads

Published

2020-02-08

Issue

Section

Articles