HARMONICS REDUCTION IN FRONT END RECTIFER OF UNINTERRUPTIBLE POWER SUPPLIES WITH ACTIVE CURRENT INJECTION
T. Chandrasekar, B. Justus Rabi and A. Kannan
DOI : 10.3844/ajassp.2014.564.569
American Journal of Applied Sciences
Volume 11, Issue 4
Harmonics are the by-products of modern electronics devices so it is necessary to mitigate the harmonics and offer techniques to mitigation of harmonics. It is greatly hampered by a three phase rectifier used as a front-end ac-to-dc converter in many systems. High power factor is achieved by injecting high-frequency currents into the three-phase rectifier. This study presents the high power factor operation of the converter with reduced total harmonic distortion up to 47.06%. The power quality up gradation is due to high-frequency current injection, at the input of the front-end rectifier. Sinusoidal PWM technique is used for controlling the output voltage. DSP is used for generating the desired gate pulses. The converter has high efficiency, low EMI emissions, high power packing density and suitable for UPS system.
© 2014 T. Chandrasekar, B. Justus Rabi and A. Kannan. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.