Design and Analysis of a Six-Phase Vienna Rectifier

Vienna rectifiers are used in certain industrial applications. They are generally designed as 3-phase. This study focus is design and availability of 6-phase Vienna rectifier to be used with a 6-phase generator. As the demand for electrical power increases, an increase in generator voltages is needed to increase the efficiency of the system. This brings about the implementation of an AC/DC converter with reduced disturbing input current effects. This paper proposes a 6-phase Vienna rectifier with smooth input current with a reduced THD. Control algorithm and power electronic circuit were all simulated in PLECS. Hysteresis control loop was built-in for output voltage control. Standard PI controllers were implemented for voltage control, and to balance the output filter capacitor voltages. Mathematical model explaining input and output voltage relations is presented in the paper. A naturally low THD was obtained as a contribution of 6-phase design.