Evaluation of Alternative AC Filter Building Blocks (FBB) for Modular Three-Level Grid-Tied Inverters
The mutual inductance of the coupled inductor Mdmci is used to attenuate DM circulation between channels while the boost inductor Mdm1 in the loop is used for control and minimization of the switching ripple. Ideally, the loop itself does not see any switching frequency ripple, and the inductance in the loop is used for additional boost impedance to block load frequency harmonics (real/reactive power flow components).
In addition to this new topology, a multi-objective/multi-vari- able optimization procedure is adopted to maximize the power den- sity and efficiency of this FBB. Future work will involve a modular EMI solution for such three-phase, ac-dc converters and comparison with other topologies.