Shunt Active-Power-Filter Topology Based on Parallel Interleaved Inverters
Asiminoaei, L.; Aeloiza, E.; Enjeti, P.N.; Blaabjerg, F.
Industrial Electronics, IEEE Transactions on
Volume 55, Issue 3, March 2008 Page(s):1175 - 1189
Digital Object Identifier 10.1109/TIE.2007.907671
Summary:In this paper, an interleaved active-power-filter concept with reduced size of passive components is discussed. The topology is composed of two pulsewidth-modulation interleaved voltage-source inverters connected together on the ac line and sharing the same dc-link capacitor. The advantages of the proposed approach are as follows: 1. significant reduction in the linkage inductors' size by decreasing the line-current ripple due to the interleaving; 2. reduction of the switching stress in the dc-link capacitor, due to the shared connection; and 3. more accurate compensation for high-power applications, because the power sharing allows one to use a higher switching frequency in each inverter. This paper analyzes the design of the passive components and gives a practical and low-cost solution for the minimization of the circulation currents between the inverters, by using common-mode coils. Several simulation results are discussed, and experimental results with a three-phase 10-kVA 400-V unit are obtained to validate the theoretical analysis.
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