Design of Symmetrical Magnetic Integrated Filter with Balanced Flux Paths for the Grid-Connected Inverter

Magnetic components such as inductors constitute a major proportion of the overall size and volume of grid-connected inverters. This paper presents an exploratory investigation into the magnetic integration of a three-phase LCL filter induction system, employing a Y-configured core that achieves equal magnetic flux pathways. Compared to using a conventional rectangular core, the proposed Y -shaped core configuration demonstrates a volumetric reduction of over 10
^%
for the three-phase inductors, while preserving the integrity of LCL filter functionality. The magnetic circuit analysis of the Y -shaped core is complemented by three-dimensional Finite Element Analysis (FEA) simulations to validate the theoretical calculations and reduced volumetric size. By enhancing the symmetry of magnetic flux distribution, this integrated inductor design significantly contributes to the miniaturization of three-phase grid-connected inverters without compromising their filtering performance.