Experimental Parameter Extraction of the Full-Order Impedance Matrix Model for the High-Frequency Magnetic Link of an MAB Converter

This work proposes a single-port measurement scheme for extracting the impedance matrix (Z-matrix) model parameters for the high-frequency magnetic link (HFML) of a multi-active bridge converter (MAB), as opposed to individual, error-prone, two-port concurrent voltage-current measurements. The Z-matrix is extracted over a wide-frequency range to estimate the HFML branch currents relative to other existing HFML models. The accuracy of the extracted Z-matrix is verified by comparing the analytical estimates to steady-state experiments conducted on a 3.2 kW SiC four-port MAB prototype. The improved accuracy of the Z-matrix over existing HFML models validates the proposed single-port parameter extraction method.