Comparative Analysis of Vienna Rectifiers over Conventional Diode Bridge Rectifiers

46 Abstract -Efficient control of power has popularized the use of power electronic components and the challenges in their implementation have forced the developers to develop auxiliaries and schemes for their trouble free operation and control but the very approach is making the power system and equipment extensive and complex. Thus has arisen a need to obtain a device that is robust, highly efficient, and simple as a diode-based rectifier and also able to benefit from the PWM rectifier capability to reduce the line current harmonic content. This paper presents highly efficient three-phase high powerfactor hybrid rectifiers assembled by the parallel connection of a three-phase diode-bridge rectifier and series dc–dc boost converter with a three-level unidirectional pulse width modulated VIENNA six-switch rectifiers. In order to evaluate the studied vienna rectifiers an efficiency comparison with conventional PWM rectifiers is performed.