Fault detection on multicell converter based on output voltage frequency analysis

Pablo Lezana, Ricardo Aguilera, José Rodríguez

Research output: Contribution to journalArticlepeer-review

149 Citations (Scopus)


Multilevel converters use a large amount of semiconductors, allowing the reconfigurate of the converter to work even on internal fault condition. This paper presents a method to detect faulty cells in a cascaded multicell converter requiring just one voltage measurement per output phase. The method is based on high-frequency harmonic analysis, using a dynamic prediction of their behavior, avoiding erroneous detection on transients while keeping the precision under real fault events. Once the faulty cell is detected, it can be bypassed allowing the converter to keep working according to previously reported techniques. Experimental results confirm accurate and fast fault detection, with a good rejection to normal operation transients.

Original languageEnglish
Pages (from-to)2275-2283
Number of pages9
JournalIEEE Transactions on Industrial Electronics
Issue number6
Publication statusPublished - 2009


  • Digital control
  • Fault diagnosis
  • Multilevel systems
  • Power electronics

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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