A Seven-Level Inverter Topology for Induction Motor Drive Using Two-Level Inverters and Floating Capacitor Fed H-Bridges

A multilevel inverter topology for seven-level space vector generation is proposed in this paper. In this topology, the seven-level structure is realized using two conventional two-level inverters and six capacitor-fed H-bridge cells. It needs only two isolated dc-voltage sources of voltage rating V...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2011-06, Vol.26 (6), p.1733-1740
Main Authors: Rajeevan, P. P., Sivakumar, K., Patel, C., Ramchand, R., Gopakumar, K.
Format: Article
Language:English
Subjects:
Applied sciences
Capacitors
Dielectric, amorphous and glass solid devices
Electric power
Electrical engineering. Electrical power engineering
Electrical equipment
Electrical machines
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Floating capacitor
H-bridge
induction motor drive
Induction motors
Inverters
Modulation
multilevel inverters
Power electronics, power supplies
Regulation and control
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Switches
Topology
Windings
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Summary:A multilevel inverter topology for seven-level space vector generation is proposed in this paper. In this topology, the seven-level structure is realized using two conventional two-level inverters and six capacitor-fed H-bridge cells. It needs only two isolated dc-voltage sources of voltage rating V dc /2 where V dc is the dc voltage magnitude required by the conventional neutral point clamped (NPC) seven-level topology. The proposed topology is capable of maintaining the H-bridge capacitor voltages at the required level of V dc /6 under all operating conditions, covering the entire linear modulation and overmodulation regions, by making use of the switching state redundancies. In the event of any switch failure in H-bridges, this inverter can operate in three-level mode, a feature that enhances the reliability of the drive system. The two-level inverters, which operate at a higher voltage level of V dc /2, switch less compared to the H-bridges, which operate at a lower voltage level of V dc /6, resulting in switching loss reduction. The experimental verification of the proposed topology is carried out for the entire modulation range, under steady state as well as transient conditions.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2010.2090541