A Simple and Accurate Leakage Inductance Adjustment Method for Medium Frequency Transformer

Abstract

The leakage inductance of the medium frequency transformer would affect the power transmission capacity and efficiency of the solid-state transformer, and should be precisely adjusted. The paper proposed a method to adjust the leakage inductance by adjusting the winding arrangement. Compared with the traditional method by changing the distance between the primary and secondary windings or the number of winding turns, the proposed model considers the freedom of winding arrangement such as turn-to-turn distance that traditional methods often ignored. The paper gave the accurate adjustment interval and the method could achieve continuous adjustment of leakage inductance in a larger range. It also doesn't change other magnetic parameters, and is basically free to use at no cost. The accuracy and feasibility of the method were verified through simulation. In multiple cases, the theoretical adjustment method is with only 4.5% compared to simulations, and below 8.8% to all experiments.