Active DC voltage balancing PWM technique for high-power cascaded multilevel converters

Luca Tarisciotti, Pericle Zanchetta, Alan Watson, Stefano Bifaretti, Jon C. Clare, Patrick W. Wheeler

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)


In this paper, a dedicated pulse width modulation (PWM) technique specifically designed for single-phase (or four wire three-phase) multilevel Cascaded H-Bridge Converters is presented. The aim of the proposed technique is to minimize the DC-Link voltage unbalance, independently from the amplitude of the DC-Link voltage reference, and compensate the switching device voltage drops and on-state resistances. Such compensation can be used to achieve an increase in the waveform quality of the converter. This is particularly useful in high-power low supply voltage applications where a low switching frequency is used. The DC-Link voltage balancing capability of the method removes the requirement for additional control loops to actively balance the DC-Link voltage on each H-Bridge, simplifying the control structure. The proposed modulation technique has been validated through the use of simulation and extensive experimental testing to confirm its effectiveness.

Original languageEnglish
Article number6748051
Pages (from-to)6157-6167
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Issue number11
Publication statusPublished - 1 Jan 2014


  • Multilevel converters
  • predictive control
  • smart grid

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Computer Science Applications
  • Electrical and Electronic Engineering


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