A Current Source Inverter for UPS

Abstract

An uninterruptible power supply (UPS) system using a current source inverter is proposed. A single phase and a three phase load commutated current source inverter suitable for this UPS system is presented. The load commutation is achieved by selecting the output filter to maintain a net leading power factor at the inverter output over the operating load range. A steady state analysis of the inverter power circuits is given. The analysis is based on using the harmonic series of the inverter output current to obtain the circuit voltages and currents. The theoretical results presented in this paper are verified on experimental models for both the single phase and the three phase inverters.