Performance comparison and Stability analysis of power factor Correction converters

Abstract

Power electronic converters are booming to a large extent to achieve increased energy efficiency, power quality, productivity and reliability in manufacturing applications. Majority of the domestic loads, industrial drives, automotive and robotic applications, utility systems employing High voltage DC transmission and excitation systems, etc employ power electronic converters to convert AC power into DC power. Thus, power quality issues are the most significant research challenge in all of the above applications. In order to address this issue, the use of passive filters for smoothening the voltage profile on the DC side often results in high AC line current distortions, flattening of AC input voltage, low power factor, Electro Magnetic Interference (EMI) generation, etc. The aforementioned issues lead to poor line utilization on the utility side and decreased power packing density. newlineThe increased awareness of power quality issues has led to the development of a variety of active Power Factor Correction (PFC) techniques suitable for low power to high power applications. These PFC techniques are found to provide reliable solutions and also to meet IEC 61000-3-2 and IEEE STD 519 standards. Therefore, this thesis addresses the PFC techniques employed in low power applications. To reduce the cost, PFC techniques employed in low power applications often employ a diode bridge rectifier followed by a DC-DC converter which is controlled to improve the supply side power factor. The aim of the proposed work is to investigate the stability and EMI issues in low power PFC converter systems newline newline newline