Comparison of 2- and 3-level active filters with enhanced bridge-leg loss distribution

Thiago B. Soeiro, Mario Schweizer, Jörgen Linner, Per Ranstad, Johann W. Kolar

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

24 Citations (Scopus)


In this paper an efficiency comparison between 3-phase shunt active filters derived from the 2-level VSC, the 3-level NPC, Active NPC (A-NPC) and the T-type VSC is presented. In order to address the loss distribution issue of the 3-level topologies, while keeping the efficiency of the system high, a space vector modulation scheme incorporating a special clamping of the phase is proposed. It is shown that 3-level active filters can have their losses well distributed over the chip dies, leading to only a small difference in their operating temperatures. Additionally, a semiconductor area based comparison is used to further evaluate the studied active filter systems. Finally, experimental results obtained with a 12kVAr/48kHz 3-level NPC based shunt active filter employing custom SiC power modules are presented in order to demonstrate the performance and feasibility of this solution.
Original languageEnglish
Title of host publication8th International Conference on Power Electronics - ECCE Asia
Number of pages8
ISBN (Print)978-1-61284-956-0
Publication statusPublished - 3 Jun 2011
Externally publishedYes
Event8th International Conference on Power Electronics, ICPE 2011 - Jeju, Korea, Republic of
Duration: 30 May 20113 Jun 2011
Conference number: 8


Conference8th International Conference on Power Electronics, ICPE 2011
Abbreviated titleICPE 2011
Country/TerritoryKorea, Republic of


  • Active filters
  • Switches
  • Power conversion
  • Clamps
  • Modulation
  • Voltage control
  • n/a OA procedure


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