Generation of Higher Number of Voltage Levels by Stacking Inverters of Lower Multilevel Structures with Low Voltage Devices for Drives

Viju R. Nair, Arun S. Rahul, R. Sudharshan Kaarthik, Abhijit Kshirsagar, K. Gopakumar

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

This paper proposes a new method of generating higher number of levels in the voltage waveform by stacking multilevel converters with lower voltage space vector structures. An important feature of this stacked structure is the use of low voltage devices while attaining higher number of levels. This will find extensive applications in electric vehicles since direct battery drive is possible. The voltages of all the capacitors in the structure can be controlled within a switching cycle using the switching state redundancies (pole voltage redundancies). This helps in reducing the capacitor size. Also, the capacitor voltages can be balanced irrespective of modulation index and load power factor. To verify the concept experimentally, a nine-level inverter is developed by stacking two five-level inverters and an induction motor is run using V/f control scheme. Both steady state and transient results are presented.

Original languageEnglish (US)
Article number7404050
Pages (from-to)52-59
Number of pages8
JournalIEEE Transactions on Power Electronics
Volume32
Issue number1
DOIs
StatePublished - Jan 2017

Keywords

  • Cascaded H-bridge inverter (CHB)
  • Topology
  • flying capacitor (FC)
  • induction motor (IM) drive
  • low voltage devices, multilevel inverter (MLI)
  • pulse width modulation (PWM)

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