GENERALIZED OBSERVABILITY ANALYSIS AND MEASUREMENT CLASSIFICATION

Network observability analysis is formulated in a way to incorporate t he conventional as well as unconventional measurements, including line currents. This formulation has two essential advantages over the exis ting methods of network observability analysis: (1) it detects not onl y unobservability but also uniqueness of the observed state, (2) it ca n directly identify the unobservable or nonuniquely observable branche s without having to remove the irrelevant injections in an iterative m anner, In addition, unlike the numerical observability analysis method s proposed so far, it can readily identify residual spread components and critical measurements. The proposed formulation is implemented and tested on sample power systems.