MSEE Thesis. Supported by the Purdue Electric Power Center


Conventional three-phase, six-pulse rectifiers produce harmonic currents which propagate into the ac power system from which they are supplied. A two-phase, four-pulse rectifier can be operated such that there are no ac harmonic currents generated. In this connection, although there is no harmonic impact, the three-phase load current is imbalanced. The operation of a line-commutated two-phase, four-pulse rectifer [rectifier] served by the Scott and LeBlanc three-phase to two-phase transformer connections is simulated using a digital computer program in this thesis. Several different methods of rectification for a two-phase bridge are simulated and their current waveforms analyzed for harmonic content and balance. Also, the total harmonic distortion and the telephone influence factors of alternative connections and configurations are calculated. Finally, general comparisons with three-phase, six-pulse rectifiers served by conventional transformer connections are presented

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