| Abstract |
This paper presents the basic configuration and the control of an unconventionnal off-line standby uninterruptible power supply (UPS); both its converters, connected in series between AC mains supply and battery, are entirely reversible. A switching single-phase bridge ensures the double-fonction: PWM rectifier with an input current spectral optimization and PWM Inverter providing a quasi sinewave voltage to the load. The second converter is in fact a three-pole switch, also called commutation cell, working as a step-down/step-up chopper. It is controlled to adapt the battery voltage level to a
capacitor's level; this last component is acting as a buffer between both converters. The authors use a new formalism, Hautier and Guillaud (1), for modeling and research of control algorithms which are illustrated by simulated results. |
