Improved harmonic performance of cascaded H-bridge converters with thermal control

Vito Giuseppe Monopoli, Abraham Marquez, Jose I. Leon, Youngjong Ko, Giampaolo Buticchi, Marco Liserre

Research output: Journal PublicationArticlepeer-review

18 Citations (Scopus)
3 Downloads (Pure)

Abstract

Among multilevel converter topologies, the cascaded H-bridge (CHB) converter is one suitable solution for multiple applications, such as flexible ac transmission systems and motor drives. CHB presents a natural high modularity because it is formed by the serial connection of H-bridges. This paper deals with a CHB where the cells do not have the same aging because the maintenance during the years of operation forces to replace some damaged cells of the converter with new or repaired ones. A method based on clamping one power cell can be used to reduce the power losses of that cell reducing its temperature and increasing its lifetime. However, clamping one cell of the CHB introduces high harmonic distortion around twice the carrier frequency due to the CHB unbalanced operation when a conventional phase-shifted pulsewidth modulation (PWM) is applied. A deep harmonic distortion analysis of the CHB output voltage with thermal control based on clamping one cell is presented. Using this analysis, the harmonic distortion at twice the carrier frequency is eliminated applying a nonconventional phase-shifted PWM where the angles between the carriers of consecutive power cells are modified. Experimental results show how the thermal control applying the clamping of a power cell is achieved while the harmonic distortion around twice the carrier frequency is eliminated.

Original languageEnglish
Article number8464672
Pages (from-to)4982-4991
Number of pages10
JournalIEEE Transactions on Industrial Electronics
Volume66
Issue number7
DOIs
Publication statusPublished - Jul 2019

Keywords

  • Harmonic analysis
  • multilevel converters
  • pulsewidth modulation (PWM)

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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