Modulation Methods for Three-level Neutral-Point-Clamped Inverter Achieving Stress Redistribution under Moderate Modulation Index

Research output: Contribution to journalLetterpeer-review

44 Citations (Scopus)

Abstract

This letter investigates the loss and thermal behaviors of a three-level neutral-point-clamped (3L-NPC) inverter undergoing moderate modulation index, which is typically presented during minor voltage sags of the power grid or speed changes of the electric machines. A series of new space vector modulation methods is then proposed to relocate the thermal loading among the power devices. It is concluded that, with some of the proposed modulation methods, the device loading in the 3L-NPC inverter can be effectively modified and optimized, and the junction temperature of the most stressed devices can be also relieved. The control ability of DC-bus midpoint potential, which is one of the crucial considerations for the 3L-NPC topology, is also investigated when applying the proposed modulation methods.
Original languageEnglish
JournalI E E E Transactions on Power Electronics
Volume31
Issue number1
Pages (from-to)5-10
Number of pages6
ISSN0885-8993
DOIs
Publication statusPublished - Jan 2016

Keywords

  • Modulation
  • Neutral point current
  • Space vector modulation (SVM)
  • Three-level neutral-point-clamped (3L-NPC)

Fingerprint

Dive into the research topics of 'Modulation Methods for Three-level Neutral-Point-Clamped Inverter Achieving Stress Redistribution under Moderate Modulation Index'. Together they form a unique fingerprint.

Cite this