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A new modified discrete particle swarm optimization (DPSO) technique is developed to determine the optimal number and locations for phasor measurement units (PMUs) in power system network for different depth of unobservability. The PMUspsila readings are to be utilized using a newly developed technique for on-line voltage stability monitoring. The DPSO developed technique is tested on 14-bus and 57-bus IEEE standard systems. It is also applied on a large system depicted from the Egyptian unified electrical power network. The allocation result is taken into consideration to be used for monitoring the voltage stability status of the system.