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A Five-Level Inverter Topology with Single-DC Supply by Cascading a Flying Capacitor Inverter and an H-Bridge

Roshankumar, P and Rajeevan, PP and Mathew, K and Gopakumar, K and Leon, Jose I and Franquelo, Leopoldo G (2012) A Five-Level Inverter Topology with Single-DC Supply by Cascading a Flying Capacitor Inverter and an H-Bridge. In: IEEE TRANSACTIONS ON POWER ELECTRONICS, 27 (8). pp. 3505-3512.

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Official URL: http://dx.doi.org/10.1109/TPEL.2012.2185714

Abstract

In this paper, a new three-phase, five-level inverter topology with a single-dc source is presented. The proposed topology is obtained by cascading a three-level flying capacitor inverter with a flying H-bridge power cell in each phase. This topology has redundant switching states for generating different pole voltages. By selecting appropriate switching states, the capacitor voltages can be balanced instantaneously (as compared to the fundamental) in any direction of the current, irrespective of the load power factor. Another important feature of this topology is that if any H-bridge fails, it can be bypassed and the configuration can still operate as a three-level inverter at its full power rating. This feature improves the reliability of the circuit. A 3-kW induction motor is run with the proposed topology for the full modulation range. The effectiveness of the capacitor balancing algorithm is tested for the full range of speed and during the sudden acceleration of the motor.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the IEEE
Keywords: Flying capacitor (FC); H-bridge; induction motor drive; multilevel inverter
Department/Centre: Division of Electrical Sciences > Electronic Systems Engineering (Formerly, (CEDT) Centre for Electronic Design & Technology)
Date Deposited: 18 Jul 2012 05:30
Last Modified: 18 Jul 2012 05:30
URI: http://eprints.iisc.ernet.in/id/eprint/44425

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