State estimation through optimally placed PMU

Phase Measurement Units (PMUs) have become the most popular and reliable device for the monitoring of power system network because it provides the real time voltage and current phasors, synchronized with Global Positioning System (GPS). For the observability of system, an Integer Linear Programming (ILP) method is used. It also reduces the number of PMUs and maximizes the measurement redundancy in the power system buses. This paper utilizes two approaches, Newton Raphson method and Weight Least Squares (WLS) state estimation method for estimating voltage magnitude and phase angles at each bus. The true value obtained from NR method is compared with the estimated values obtained from WLS with and without inclusion of PMU measurements. The employed techniques are tested on IEEE-14 and 30 bus system for determining the optimal points of placement of PMUs to measure the accurate voltage magnitude and phase angle at each bus.