Electrical Distribution System with High power quality Based on Power Electronic Transformer (original) (raw)

2016

Abstract

---------------------------------------------------------------------***--------------------------------------------------------------------Abstract Power Electronic Transformer became more interested in recent years as an alternative to the conventional transformer. Although its behavior is identical to the conventional transformer, power electronic transformer is smaller in size and provides capability for controlling and enhancing the power quality of electrical systems. In this paper, a new configuration of power electronic transformer is considered and examined to perform identical behavior of traditional transformer in electrical distribution system. The proposed topology of this transformer consists of three stages these are; input stage, isolation stage and output stage. The input stage employs three-phase Vienna rectifier for rectifying the AC voltage source and with proper control it keeps input power factor near unity with low harmonic distortion of input currents. Configuring of isolation stage achieved by using single phase inverter connecting to the input of high frequency transformer which its output connected to a single phase uncontrolled rectifier. Three-phase 5-level diode-clamped inverter is utilized as an output stage. Performance of the proposed structure is verified by simulation which indicates high quality results from power utility and harmonic distortion points of view.

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