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. [ABSTRACT FROM AUTHOR]