Performance of a single-stage UPS system for single-phase trapezoidal-shaped ac-voltage supplies

TitlePerformance of a single-stage UPS system for single-phase trapezoidal-shaped ac-voltage supplies
Publication TypeJournal Article
Year of Publication1998
AuthorsJain, P. K., J. R. Espinoza, and H. Jin
JournalIEEE Transactions on Power Electronics
Volume13
Pagination912–923
ISSN0885-8993
Abstract

A high-performance single-stage UPS system for single-phase ac power supply systems is presented. The topology generates a trapezoidal-shaped load voltage that is synchronized with the ac supply, therefore, a small de-link capacitor is required. This feature leads to a high-input power factor (0.94 at nominal voltage), and due to the single-stage structure, high efficiency (93% at nominal voltage) is also achieved. Moreover, in both cases the supply current spectrum presents low-order harmonics, all of which satisfy IEC 555, The high performance is validated using both resistive (linear) and diode RC (nonlinear) loads. The dynamic performance of the UPS system is also analyzed under different transient conditions. Specifically, the supply to battery, battery to supply transition, load transient, and supply/battery-voltage transients are performed. They show a transfer time of 500 mu s (from ac supply to battery) and overvoltages of at most 15%, The dynamic and static evaluations are performed on a 1-kVA UPS system. The design guidelines for the keg components and control parameters are also included.

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