Observability of System Using Optimal PMUs Location

Now a day the power demand by the world is rising by a high rate. In order to complete the demand, we are using power transmission lines. Due to some disturbances, there is a loss of power generation, or may be a change of frequency exists, and the level of current increases. The system should be stable in order to fulfill the demand of load under the normal condition as well as under faulty conditions. Due to these reasons today we are using Phasor Measurement Unit(PMU) in order to monitor the system whether the system is stable or not. With the help of PMU, we can measure the phasor magnitude of both voltage and current unlike Supervisory Control And Data Acquisition (SCADA). The measurements done by PMUs are synchronized by time with help of Global positioning system (GPS). It has the ability to monitor the system all the time and see where the fault occurs and it generates a control signal according to the fault. Hence the stability of the power system will be increased. But the cost of these PMU is not cheaper therefore we cannot use it everywhere. So to decrease the number of PMU we optimized it. In this paper, we have considered the Hybrid Global Search optimization technique to reduce the number of PMUs in the system.