Abstract
A novel harmonic mitigator based on the 12-pulse ac–dc converter, which is capable of suppressing up to 11th harmonics, is presented with reduced magnetic rating and low total harmonic distortion (THD) of ac mains current. A set of power quality indices on input ac mains and magnetic ratings for various autoconnected transformer configurations for the 12-pulse converter feeding a low voltage, high current and 12 kW switched mode power supply is also presented so that the best autoconnected transformer configuration can be chosen according to the requirements for this application. A laboratory prototype of the proposed ac–dc converter is developed and the test results are presented to validate the design and model of the converter system.
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