Power Density Enhancement of Three-Phase Rectifier Using Higher Frequency Solid State Transformer

This article introduces an isolated three-phase six-pulse rectifier using a solid-state transformer.The line frequency utility grid voltage is modulated by a frequency boost converter.This converter exists two parts.The first part is the rectifier section, and the second one is the inverter section.Then after, three-phase diode rectifier is powered by the medium frequency transformer 2 kHz to shrink the transformer size upto 20% or even 10% depensing to the frequency operating range for silicon steel core materials.The aim of this study is to shrink the occupied size of the rectifier using a higher frequency transformer.The study realizes that the grid line current has the same frequency contents as a regular three phase rectifier.In other words, the presented idea results in smaller weight and size while sustaining the performance of input current total harmonic distortion THD=31%.High power density power electronics converter would be extremely valuable for applications such as electric vehicle railways and aircraft.The proposed approach is reliable and easy to use.The solid-state transformer contributes to isolating and improving the overall converter's power density.Simulation results for the 16 kW converter were verified using MATLAB Simulink.