In this paper. the particle swarm optimization (PSO) technique is used to optimally allocate phasor measurement units (PMUs) within standard test systems and a real-world power system. PMUs are allocated at system substations in a manner that ensures complete system observability while minimizing installation costs. This study considers IEEE 14-. https://www.diegojavierfares.com/hot-price-U-S-POLO-ASSN-Blue-Cotton-Men-Sweater-p18350-great-buy/