A Hybrid Seven Level Inverter Topology with a Single DC Supply and Reduced Switch Count

Rahul, Arun S and Kaarthik, Sudharshan R and Gopakumar, K and Rajeevan, PP and Franquelo, Leopoldo G and Leon, Jose I and Nagy, Istvan (2015) A Hybrid Seven Level Inverter Topology with a Single DC Supply and Reduced Switch Count. In: 17th European Conference on Power Electronics and Applications (EPE ECCE-Europe), SEP 08-10, 2015, Geneva, SWITZERLAND.

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Abstract

In this paper, a new three-phase hybrid seven level inverter topology with a single DC supply is proposed for the first time. The proposed inverter is realized by cascading two three level flying capacitor inverters with a half bridge module. The inverter topology is having multiple switching state redundancies for each of the pole voltage levels. By using these switching state redundancies, capacitor charging can be controlled in every PWM switching cycle. This feature is advantageous for reducing the capacitor sizing. Another advantage of the proposed inverter is that the charge balancing of each capacitor can be controlled irrespective of modulation index and load power factor. A hysteresis controller based capacitor charge control algorithm is implemented for the proposed inverter. Furthermore, the proposed topology uses lesser number of semiconductor devices, capacitors and DC power supplies compared to conventional seven level inverter topologies. The proposed topology is tested with open loop V/f control scheme in an induction motor drive. Inverter is tested for entire modulation range, and experimental results for steady-state operation are presented for various fundamental frequencies. Experimental results showing the effectiveness of capacitor charge control for both steady state and transient operating conditions are presented.

Item Type:	Conference Proceedings
Series.:	European Conference on Power Electronics and Applications
Publisher:	IEEE
Additional Information:	Copy right for this article belongs to the IEEE, 345 E 47TH ST, NEW YORK, NY 10017 USA
Keywords:	Adjustable speed drive; Multilevel converters; Pulse Width Modulation (PWM); Induction motor
Department/Centre:	Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Date Deposited:	08 Jul 2016 05:37
Last Modified:	08 Jul 2016 05:37
URI:	http://eprints.iisc.ac.in/id/eprint/54170

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