Enhance Power Transfer in Existing Transmission Line by Simultaneous AC-DC Transmission

Abstract

The power transfer through the existing long AC transmission line is limited by SIL (surge impedance loading) limit which is much below the thermal limit of conductor due to large inductive reactance of line. To increase power transfer capacity either new lines are erected or SIL increasing by restructuring the existing line. So instead of erecting newlines the existing AC lines are modified to simultaneous AC-DC lines to increase their power transfer capability close to their thermal limits. This paper presents the method to convert an existing double circuit EHVAC line into a simultaneous AC-DC transmission line. Double circuit line is compared with AC DC line Sending end power, receiving end power and transmission losses of both the systems are found out.