A Comparative study of control topologies for single-phase UPS inverter system

Abstract

Uninterruptible Power Supplies (UPS) have several closed loop control topologies for control of Voltage Source Inverter (VSI). The topologies vary mainly due to choice of control/feedback variable. This paper attempts to categorize different control topologies and highlights the similarities/differences between them. Further, an analytical study on the basis of steady-state and transient performance, design complexity and cost is also presented. Respective control strategies under different loading conditions have been simulated in MATLAB environment in Discrete Time Frame (DTF) for comparative analysis.