The paper proposes a new tool for real-time assessment of measurement sets in the context of power-system-state estimation. This tool incorporates many functions including observability analysis and restoration, as we...
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The paper proposes a new tool for real-time assessment of measurement sets in the context of power-system-state estimation. This tool incorporates many functions including observability analysis and restoration, as well as identification of critical measurements and critical sets. Using only network-topology data, the proposed methodology updates the qualitative characteristics of the current available measurement set in real time. The identification of critical measurements and sets is done using only network topology and is completed before running any state estimation. Mapping the system states and using information concepts, a new state space is obtained where the relationship (information) between measurements and states is straightforward. This map is easily found via triangular factorisation of the Jacobian matrix. Starting from a base-case measurement set, every time a snapshot of measurements has to be analysed, only refactorisation has to be carried out. Sparse-matrix techniques speed up the process. The method was tested in the IEEE-14-bus system as well as in the Brazilian 383-bus system, proving to be reliable, fast, easy to implement and suitable for real-time operation.
作者：
Bretas, NGEESC
University of São Paulo São Carlos SP Brazil
A theory is developed to test network observability, to identify possible subnetworks which might be observable, and, in case the network is not observable, to identify the minimal set of measurements (pseudo) to be a...
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A theory is developed to test network observability, to identify possible subnetworks which might be observable, and, in case the network is not observable, to identify the minimal set of measurements (pseudo) to be added so that the network as a whole becomes observable. Algorithms to test network observability and to identify subnetworks of the entire system that might be observable are also presented. An algorithm to add a minimal set of measurements to the existing measurements, so that the network becomes observable as a whole, is developed. The theory and algorithms that result are a combination of factorisation path concepts and triangularisation of the gain matrix G. Such algorithms have the characteristics of being very simple, easy to implement, extremely fast and reliable. Algorithms resulting from this theory do not require solutions of any algebraic equation.
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