State Estimation with Optimal PMU Placement Considering Various Contingencies

Phasor Measurement Unit (PMU) has become a vital tool for power systems monitoring and protection purposes. Power systems state estimation (SE) can be done with the help of synchro-phasor measurements which requires complete observability of the system through PMUs. A new algorithm based on maximum connectivity of buses to lines has been suggested in this paper to find out optimal locations and number of PMUs in normal condition, in addition to several contingencies like single or double PMU failures and also single line outages. The efficacy of the proposed algorithm has been evaluated by testing it on IEEE 6, 14, 30, 57, 118 bus test systems, as well as Damodar Valley Corporation (DVC) 38 bus practical system. Further, a new state estimation algorithm has also been proposed in this paper which utilizes the measurements from optimally placed PMUs in the aforesaid manner. For completeness, this algorithm also incorporates a method for detection and identification of bad data. The test results presented reveal the effectiveness of the proposed methods for online application.

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