A hybrid seven level inverter topology with a single DC supply and reduced switch count

S. Arun Rahul, R. Sudharshan Kaarthik, K. Gopakumar, P. P. Rajeevan, Leopoldo G. Franquelo, Jose I. Leon, I. Nagy

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

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.

Original languageEnglish
Title of host publication2015 17th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9789075815221
DOIs
Publication statusPublished - Oct 27 2015
Event17th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2015 - Geneva, Switzerland
Duration: Sep 8 2015Sep 10 2015

Other

Other17th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2015
CountrySwitzerland
CityGeneva
Period9/8/159/10/15

Keywords

  • Adjustable speed drive
  • Induction motor
  • Multilevel converters
  • Pulse Width Modulation (PWM)

ASJC Scopus subject areas

  • Fuel Technology
  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology

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  • Cite this

    Rahul, S. A., Kaarthik, R. S., Gopakumar, K., Rajeevan, P. P., Franquelo, L. G., Leon, J. I., & Nagy, I. (2015). A hybrid seven level inverter topology with a single DC supply and reduced switch count. In 2015 17th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2015 [7309051] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/EPE.2015.7309051