The calculated results are verified by measuring the core losses of the filter inductor in a three-level NPC inverter. The low-frequency loss is analyzed in depth from the hysteresis curves in the B-H plane. A novel model of minor loops is proposed to calculate the high-frequency losses based on the simulation results and Steinmetz parameters of cores. By utilizing the curves of permeability versus DC bias provided by core vendors instead of plenty tests, the paper establishes a relation between the DC bias and the core losses. It calculates the low-frequency losses and the high-frequency losses separately. In this paper, a practical core loss calculation method based on the modified Steinmetz equation is proposed.
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