Implementation of the first commercial medium power active front end transformerless uninterruptible power supply made in Iran

摘要

Today there are numerous companies in Iran manufacturing Uninterruptible Power Supplies (UPS). However, in medium and high power range they manufacture online double conversion transformer based UPSs, with thyristor controlled rectifier. In this paper the power topology, control algorithm and experimental results of the first commercial active front end 30 KVA transformerless UPS in Iran is presented.