Analysis and design of electronic transformers for electric power distribution system

Abstract

A power transformer performs many functions such as voltage transformation, isolation, noise decoupling and is an indispensable component in electricity distribution systems. However, at low frequencies (60/50 Hz) it is a bulky and expensive component. In this paper, the concept of electronic transformers is further discussed. Several possible topologies employing static power converters connected on the primary and secondary side in combination with magnetic circuits are explored to realize a high-frequency AC link. The focus of this paper is to realize an electronic transformer as a power delivery component in an electric distribution system. Reduced size, losses, higher efficiency and better voltage regulation are some of the advantages of this approach. A 10 kVA design example along with preliminary experiment results is discussed. It is shown that a transformer designed with a conventional grain-oriented silicon steel core can process three times the power at 1 kHz operating frequency compared to 60 Hz.