Three-Phase to Single-Phase UPS Topologies

MARCELO HEY DUARTE, FERNANDO BOTTERÓN AND HUMBERTO PINHEIRO

Recife - Brasil

Congreso; COBEP 2005; 2005

Abstract – This paper describes two three-phase to single-phase UPS topologies. The first one is characterized by a double function three-phase input stage. The second one uses a 12-pulse rectifier at the input. Both UPS significantly reduce the input currents make it easier the installation in the customer premises, reducing the EMI as well as losses in the power network where the UPS is connected. As a result, these UPS topologies are strong candidates to feed single-phase critical loads in the range of 7.5kVA to 50 kVA. Design curves are given to select the passive components of the input stage such that the input power factor, unbalance factor and total harmonic distortion (THD) of the input current are kept under desired levels. Simulation and experimental results on a 10 kVA prototype are given to demonstrate the performance of the proposed circuits.