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Title: A Hybrid Nine-level Inverter Topology for an Open-end Stator Winding Induction Motor
Authors: Kumar S.
Agarwal, Pramod
Published in: Electric Power Components and Systems
Abstract: In this article, a new hybrid nine-level inverter topology for an induction motor with an open-end stator winding is proposed. In the proposed topology, one end of the open-end winding is fed by a three-phase five-level inverter, and the other end is connected to a conventional three-phase two-level inverter. The three-phase five-level structure is realized by cascading a three-level flying capacitor inverter with capacitor-fed H-bridge in each phase. In the proposed topology, a total of 17,576 space vector combinations are available; hence, the capacitor voltages can be maintained at desired levels using switching redundancies. As compared to conventional topologies that require 48 switches, the proposed topology requires only 30 switches and completely eliminates the requirement of clamping diodes, which are required in a neutral point clamped inverter. Also, it requires only two capacitors per phase, whereas the nine-level flying capacitor inverter requires 28 capacitors per phase. In case of fault in any H-bridge, the system can be operated as a five-level inverter at its full power rating and improves the reliability of the inverter. The performance of the proposed system has been experimentally investigated on a 1.5-kW open-end stator winding induction motor, and results are presented. © 2016, Copyright © Taylor & Francis Group, LLC.
Citation: Electric Power Components and Systems (2016), 44(16): 1801-1814
Issue Date: 2016
Publisher: Taylor and Francis Inc.
Keywords: cascaded inverters
flying capacitor
H-bridge multi-level inverter
induction motor drive
medium-voltage drive
multi-level inverter
Opal-RT real-time digital simulator
open-end winding induction motor
pulse-width modulation
space vector pulse-width modulation
ISSN: 15325008
Author Scopus IDs: 57209548231
Author Affiliations: Kumar, S., Department of Electrical Engineering, Indian Institute of Technology, Roorkee, Uttarakhand, India
Agarwal, P., Department of Electrical Engineering, Indian Institute of Technology, Roorkee, Uttarakhand, India
Corresponding Author: Kumar, S.; Department of Electrical Engineering, Harcourt Butler Technological InstituteIndia; email:
Appears in Collections:Journal Publications [EE]

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