A single leg switched PWM method for three-phase H-Bridge Voltage Source Converters

Osman Selcuk Senturk, Lars Helle, Stig Munk-Nielsen, Pedro Rodriguez, Remus Teodorescu

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

1 Citation (Scopus)


This paper proposes a single leg switched or a hybrid PWM (HPWM) method for three-phase three-level H-Bridge Voltage Source Converters (3L-HB-VSCs). By means of the proposed modulation, a 3L-HB-VSC can generate the same output as a three-level neutral point clamped (3L-NPC) VSC with phase disposition (PD) PWM provided that the outputs of 3L-HBVSC are isolated by transformers or connected to open winding machines. Thus, the proposed method is called PD-HPWM. Moreover, it is emphasized that 3L-HB-VSC with HPWM utilizes its switches similar to 3L-NPC-VSC. Compared to 3L-NPC-VSCs, 3L-HB-VSCs (without neutral point clamping diodes) have simpler, more modular, and more reliable 2L circuit structure. Therefore, this method encourages the use of 3L-HB-VSCs in the applications utilizing transformers such as grid-side converters of multi-MW wind turbines. The proposed PWM method's performance is demonstrated by the simulations of a 6MW wind turbine's grid connection and experimentally verified via a smallscale prototype.

Original languageEnglish
Title of host publicationProceedings of the IEEE Energy Conversion and Expo 2009
Number of pages6
Publication date2009
ISBN (Electronic)978-1-4244-2893-9
Publication statusPublished - 2009
EventIEEE Energy Conversion and Expo 2009 - ECCE 09 - San Jose, California, United States
Duration: 20 Sep 200924 Sep 2009


ConferenceIEEE Energy Conversion and Expo 2009 - ECCE 09
Country/TerritoryUnited States
CitySan Jose, California


  • H-Bridge
  • Hybrid modulation
  • Neutral point clamped
  • Multilevel converters
  • Wind energy


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