A steady-state power loss consideration of the 50kW VIENNA I and PWM full-bridge three-phase rectifiers

This paper describes the steady-state simulation results of the three-level VIENNA I and two-level PWM full-bridge three-phase rectifiers. These topologies are designed to operate at 50 kW rated output power so that the total harmonic line current distortions (THD) are 16% and 4%. The mains is assumed to be ideal (230/400 V, 50 Hz). The DC-link voltage is set at 650 V. The applied constant switching frequency is 3.5 kHz. Simulations are carried out with Simplorer®. Component models are non-ideal. On the basis of the simulation results, the losses and stresses of the active and passive components are determined and the two topologies are compared. When unidirectional power flow is considered, VIENNA I will have a better performance than PWM full-bridge because of better efficiency and smaller AC-filter components.