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

Comparison of 2- and 3-level active filters with enhanced bridge-leg loss distribution,10.1109/ICPE.2011.5944519,Thiago B. Soeiro,Mario Schweizer,Jorg

Comparison of 2- and 3-level active filters with enhanced bridge-leg loss distribution  
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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.
Conference: Internatonal Conference on Power Electronics - ICPE , pp. 1835-1842, 2011
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