A 5-Level Inverter Topology Using a Single DC-Link with Reduced Switch Count for Open-End Induction Motor Drives

Abstract

A multilevel inverter scheme with reduced number of switches using a single DC-link for open-end induction motor drive (OEIM) is presented in this paper. The total inverter system with OEIM yields voltage Space Vector Locations (SVL) alike to a 5-Level inverter. This proposed system is obtained by supplying OEIM with 3-Level inverter from one side and capacitor fed 2-Level inverter from another side. The capacitor of the 2-Level inverter is balanced by Space Vector (SV) redundancy to its nominal voltage of $V_{dc}/4$ where $V_{dc}$ is the DC-link voltage and the flying capacitors in 3-Level inverter is balanced by pole voltage redundancy to its nominal voltage of $V_{dc}/2$. The simulation and hardware results for steady and transient state operation are also presented in this paper.