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Third Harmonics Injection Applied To Three Phase/Three Level/Three Switch Unidirectional PWM Rectifier

R.Brindha , V.Ganapathy ,S.Apnapriya ,J.Venkataraman

This paper introduces third harmonics injection applied to three phase/three level/three switch unidirectional pwm rectifier. In general a Vienna rectifier converters is utilized to eliminate the low frequency harmonics in the line current while achieving unity power factor at the rectifier input terminals and load across dc output voltages.The modulation scheme incorporates third-harmonic frequency to modulate the current at dc-link. The modulated currents are then circulated through the ac-side of the Vienna rectifier, using a zigzag autotransformer. The above proposed technique is modeled in mat lab/Simulink platform