The utilization of distorting loads has been increasing exponentially, which results power quality issues in electrical power systems. Transmission of the pollution free power is an important task for power engineers. Power quality issues may affect on end user equipment like electronic goods, digital meters etc. which results the spoilage of products. To nullify the power quality concerns the custom power devices are playing a determinant role in the power systems in the present scenario. This paper mainly demonstrates on research and topology of Shunt Active Power Filters (SAF) to magnify the quality of power in sensitive industrial loads, electrical distribution networks, transmission, and power generation systems. © Springer India 2016.