SSRG International Journals
Recently there is a great need to improve power quality and maintaining power system security and reliability in highly complex and inter connected power system. The under loading and overloading of lines arises a problem of deteriorating voltage profile and power system stability. Power quality problem is due to nonstandard voltage, current or frequency that results in a failure of end use equipments. Now a-days the major power quality problems are arising due to the voltage sag and voltage swells. To overcome these problems custom power devices have introduced and emerging branch of technology providing the power system with versatile new control capabilities.