Abstract
State estimation is a key function (which provides creditable data from raw data supplied by measurement devices) in building adequate network models for on-line monitoring and analysis. The aim of this paper is to propose a modified algorithm for power system state estimation (PSSE). PSSE consist of topology process, observability analysis, state estimation (SE) solution and bad data process. In practice, after bad data/ measurement identification, bad measurement is removed from measurement set and system observability analysis is performed again. If the system is observable, SE solution is obtained. This process repeats until there is no bad measurement or no chance to remove bad measurement which causes to divergence solution. It is time taking process. In this paper, with the help of critical measurements identification existing algorithm is modified to avoid unnecessary repetitions of algorithm steps to make the algorithm simple. IEEE 14 bus, 30 bus and 118 bus systems are used for calculations and the simulation results are summarized.
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