Towards a zero-output impedance UPS system

Abstract

A categorization of loads requiring clean uninterruptible power is provided, a thorough analysis of their effects is given, and presently used partial solutions are examined. The topology of a low-impedance 3- phi high-power inverter stage, designed to alleviate substantially the current difficulties faced by interruptible power supplies (UPSs) when dealing with unbalanced and/or nonlinear loads, is described. On the basis of theoretical and extensive experimental results, it is concluded that the low-output-impedance 3- phi UPS presented performs well under both unbalanced and nonlinear load application.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>