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Abstract
Three phase transformer operates on high frequency for multi-pulse ac-dc rectifier converters, deployed to generate ac-dc 6- pulse controlled rectifiers units for analysis of multi-pulse converters, since six pulse diode rectifier couldn’t achieve the harmonics limits stands IEC 61000-3-4, and high frequency harmonic distortion (THD) generates in the ac side line current to replace with the thyristor gate controlled devices to detract the THD in ac currents and ripple free in dc voltage, to overcome by multi-pulse converters.