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
    Event14th European Conference on Power Electronics and Applications - Birmingham, United Kingdom
    Duration: 30 Aug 20111 Sept 2011
    Conference number: 14

    Conference

    Conference14th European Conference on Power Electronics and Applications
    Number14
    Country/TerritoryUnited Kingdom
    CityBirmingham
    Period30/08/201101/09/2011

    Keywords

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

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