SMART-GRID BACKUP PROTECTION BY PMU IN POWER SYSTEM

Abstract

 Power transmission lines are protected by a wide-area backup system in this article. 
PMU-based broad area backup protection for transmission lines is discussed in this study, which uses 
PMUs to locate the damaged line. The faulty backup protection zone may be identified by measuring 
the increase in zero and positive sequence currents entering the zone when a fault occurs in the 
transmission network. Using WAMS broad area data, an optimization model is created to help solve 
these issues and pinpoint the faulty line. By using linear least squares approach, a faulty line and its 
position may be determined with few measurement sites in the Backup Protection Zone (BPZ) using 
voltage and current phasors. MATLAB/Simulink is used to implement the new approach on the IEEE- 
5 bus system.