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This letter investigates the magnetic integration of the LCL filter in grid-connected inverters. By sharing an ungapped core and arranging the windings properly, the fundamental fluxes generated by the two inductors of an LCL filter cancel out mostly in the common core. Thus, the common core with low flux level can be dramatically reduced. Although the reluctance of the common core can hardly be zero,...
The LCL filter is widely used in grid-connected inverters due to its outstanding performance of attenuating the switching frequency current harmonics. An LCL filter has two individual inductors. Numbers of magnetic cores are required, and large volume has to be reserved for these two inductors. In order to reduce the core volume, magnetic integration of these two inductors is introduced in this paper...
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