Thermally Compensated Discontinuous Modulation Strategy for Cascaded H-Bridge Converters

Youngjong Ko, Markus Andresen, Giampaolo Buticchi, Marco Liserre

Research output: Journal PublicationArticlepeer-review

32 Citations (Scopus)

Abstract

A widely adopted multilevel converter topology is the cascaded H-bridge (CHB), as it can provide voltage and power scalability. However, since the CHB converter can be composed by cells with different remaining lifetime, it could be useful to delay a fault of higher aged cells in order to prolong the entire converter's lifetime. In this paper, a thermally compensated discontinuous pulse width modulation (DPWM) strategy is proposed in order to reduce the thermal stress for power semiconductors in power modules of higher aged cells. Considering the thermal cycles as the most influencing cause of wear out of power modules, the proposed method compensates the thermal cycles under a varying power profile by manipulating the clamping angle of the DPWM. Moreover, the proposed method obtains a comparable total harmonic distortion performance to the phase-shifted carrier modulation.

Original languageEnglish
Article number7900423
Pages (from-to)2704-2713
Number of pages10
JournalIEEE Transactions on Power Electronics
Volume33
Issue number3
DOIs
Publication statusPublished - Mar 2018
Externally publishedYes

Keywords

  • Active thermal control
  • cascaded H-bridge (CHB)
  • discontinuous pulse width modulation (DPWM)
  • multilevel converter
  • reliability

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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