A.Akbar Motie Birjandi - Electrical Department, Shahid Rajayee Teacher Training University
Zahra Ameli - Electrical Department, Shahid Rajayee Teacher Training University

This paper introduces topology of three phase controlled rectifiers. At first AC to DC converters were introduced, then THD is obtained by use of simulation,experimental and theoretical results and compared together. Then effect of different transformer connections has been survey on THD and Harmonic currents. Finally, to reduce harmonic currents, phase parallel connection of two rectifiers is used

Firing angle, Harmonic, Three phase controlled rectifier, Transformer connection