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Abstract—A 1.5 kV, 35 kW, 1 kHz silicon steel core
medium frequency transformer is designed and prototyped
for a 10 kV, 0.5 MW electronic power transformer. This
transformer uses 0.18 mm silicon steel as core material
due to the advantages of easy processing, high saturation
flux density, low noise, and low cost. The detailed design
considerations and an optimal design method are
presented in this paper. Different from the previous work
on medium frequency transformer design, the proposed
approach takes ripples into account. Core loss model
under square wave excitation with ripple and winding loss
model considering sideband harmonics are established.
Besides, 2D finite element simulations are adopted to
obtain ac/dc resistance factors. Finally, the proposed
approach is verified by experiments on prototype. The test
results show performance better than expected, with
efficiency over 99% and power density of 2.9623×106 W/m3.
VIEW FULL TEXT: https://ieeexplore.ieee.org/document/7862899
