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

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 dif...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2012-08, Vol.27 (8), p.3505-3512
Main Authors: Roshankumar, P., Rajeevan, P. P., Mathew, K., Gopakumar, K., Leon, Jose I., Franquelo, Leopoldo G.
Format: Article
Language:English
Subjects:
Applied sciences
Capacitors
Circuit properties
Circuits of signal characteristics conditioning (including delay circuits)
Clamps
Dielectric, amorphous and glass solid devices
Discharges (electric)
Electric currents
Electric power
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electrical equipment
Electronic circuits
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Flying capacitor (FC)
H-bridge
induction motor drive
Inverters
multilevel inverter
Power electronics, power supplies
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Switches
Switching
Topology
Vectors
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Summary: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.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2012.2185714