Transient analysis of Tehran power grid considering future planned expansion

Abstract

Future planned expansion of Tehran power network depicts that two new generating stations will be installed which result in the increase of short-circuit capacity at some of the grid substations in excess of the interrupting rating of exiting circuit breakers. Various measures regarding short-circuit current mitigation for high voltage application have been proposed in many literatures. This paper intends to investigate the consequence of utilizing three applicable measures (CLR, IPC and SCCL) by taking future model of Tehran power grid into consideration. A comprehensive comparison has been made and the results clearly demonstrate the effect of each measure on short-circuit current level, load flow results, transient stability and transient recovery of circuit breaker. For these purposes, DIgSILENT and EMTP-RV softwares are employed to simulate Tehran power grid and the outcome results revealed the benefits of utilizing IPC comparing to other measures.