The Circuit-Level Decoupling Modulation Strategy for Three-Level Neutral-Point-Clamped (TL-NPC) Inverter

Zhe Zhang, Ole Cornelius Thomsen, Michael A. E. Andersen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

In this paper, a circuit-level decoupling modulation strategy is proposed for the three-level (TL) neutral-point-clamped (NPC) inverters. With the proposed modulation scheme, the TL-NPC inverter can be decoupled into two three-level Buck converters in each defined operating section, which makes the controller design much simpler. The decoupling principle including the driving signal synthesis and the neutral point potential variation are analyzed detailed. It is found that switching losses can be reduced by one third and the voltage balance between the dividing dc link capacitors can be achieved without any feedback control. The simulation results show the validity of theoretical analysis.
Original languageEnglish
Title of host publication14. European Conference on Power Electronics and Applications
Publication date2011
ISBN (Print)9789075815153
Publication statusPublished - 2011
Event14. European Conference on Power Electronics and Applications - Birmingham, United Kingdom
Duration: 1 Jan 2011 → …
Conference number: 14

Conference

Conference14. European Conference on Power Electronics and Applications
Number14
CityBirmingham, United Kingdom
Period01/01/2011 → …

Keywords

  • Voltage Source Inverters (VSI)
  • Multilevel converters
  • Modulation strategy

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