Unity Power Factor Controller for Neutral Point Clamped Active Front End Converter with DC Voltage Balancing

摘要

The use of power electronics converters influencing the generation of harmonics and reactive power flow in a power system. Therefore, three-phase improved power quality AC-DC converters are gaining lot of popularity in power conversion applications. This paper deals with the control of three-phase neutral point clamped (NPC) 3-level AC-DC converter under balanced and unbalanced load condition. A unity power factor controller (UPC) is designed and developed for unity power factor operation of the converter under steady state and transient conditions. Further, the UPC is validated through experimentation performed on prototype developed in the laboratory.