Contribuição ao controle e paralelismo de UPS

Abstract

Basically, the operation and control of distributed networks of uninterruptible power supply (UPS) systems may be classified in two main techniques: parallelism with and without control interconnection. This work is concerned with the study of the most common schemes ineach technique presented in the literature, such as master-slave scheme which uses wires to accomplish control interconnection and the frequency and voltage droop scheme which do not use any interconnection wires. A special attention is given to the output voltage controller of the UPS inverter, implementing a repetitive controller in order to improve the overall performance of the system specially when the system feeds non-linear loads.