Design of a Single-Phase Active Front-End Converter with Closed-Loop Analysis for Power Factor Improvement

Abstract

Some conventional front end converters have many drawbacks like low power factor and high harmonic content. This work is based on the difference between the performance of single phase diode bridge rectifier and the active front-end converter in terms of the %THD of the line current and power factor improvement. There are some of the major disadvantage of conventional front-end rectifiers like low power factor and high harmonic content. Hence, improvement of power factor and reduction in line current harmonics is required. For Power Factor Correction (PFC) and harmonic reduction development of new circuit topologies and control strategies has become still more essential with the introduction of strong technical IEC standards. This work is basically on power factor improvement using phase shifted technique in which to meet the load demand as well as to improve the power factor two single phase converters are connected in parallel. Power factor of the source side will be maintained nearer to unity. Output DC link voltage will also remain constant irrespective of load as well as supply voltage variation. The control strategy for single phase front end converter consists of inner current-loop and outer voltage-loop.