A new adaptive PMU based protection scheme for interconnected transmission network system

Abstract

Protection is one of the important key features when it comes to power system. The objective of protection scheme is to keep the power system stable by isolating only the components that comes under the fault. The modernized power grids are complex and hence need to be monitored, control and protected by wide area measurement system (WAMS). WAMS helps to fetch, time synchronized data of power system operating states. This feature of WAMS will make it very popular in the coming generation smart grid protection and control. The purpose is to increase the overall efficiency and reliability of power system for all power stages via significant dependence on WAMS as distributed intelligence agents with improved monitoring, protection and control capabilities of power network. One of the finest techniques for WAMS is Phasor measurement unit (PMU). This paper speculates detection of fault location and protection of power system using PMU. The principle of the protection scheme depends on comparing positive sequence voltage magnitudes at each bus during fault conditions inside a system protection center to detect the nearest bus to the fault. Then the absolute differences of positive sequence current angles are compared for all lines connecting to this bus to detect the faulted line. The conventional methods that are been used for protection are not as accurate as the PMU because PMU uses GPS system for time synchronized data. This paper features simulation of interconnected network system for 220 KV line using MATLAB Simulink.