REVIEW OF SINGLE-PHASE MULTI-LEVEL VIENNA CONVERTERS AND PROPOSAL OF 7-LEVEL VIENNA CONVERTER FOR PFC AC / DC APPLICATIONS

Abstract

The PFC (Power Factor Correction) AC / DC Vienna converter with the least
number of control semiconductor devices has received wide attention over the
years to improve the quality of the input power systems, and to obtain utility
power factor. In this paper, the author reviews 3-level, 5-level topologies and
proposes a 7-level Vienna topology with PWM (Pulse Width Modulation)
control to eliminate low frequency harmonics in the current and to achieve
power factor equal to one at the input of the rectifier. The author simulated
and compared the THD (Total harmonic distortion) of current for all 3
structures with the same power level of 3kW. The results of the study were
verified by simulation by PSIM software.