Economic study of a Power network for observability analysis using optimal arrangement of PMUs and DULRs

For finding the power system state estimation, finding the observability is the important criteria. To observe the system, we have to monitor the entire system for each and every second. For monitoring and control of an entire power system, number of techniques is available. Out of all existing WAMS phasor Measurement Unit (PMU) is one of most important technique for monitoring of system. Placement of PMU’s is the major trouble because they are little expensive. This problem can be overcome by finding minimum no of PMU’s using incomplete observability analysis. PMU placement costs have increased over the past. In that the substation advancing cost is the primary concern because the advancing cost is much higher than the cost of individual device. The optimal PMU placement requires for considering the expenses for advancing the substation along with the cost of individual PMU that needs to be placed at particular substations. This paper presents the overall comparison of past proposed techniques on PMU placement schemes by using different state estimations.