# Power System State Estimation in Polar Coordinate System. Significance of Specific Information on Symmetrical Phase Shifter

## Main Article Content

## Abstract

Power system state estimation is a calculation procedure, which plays an essential role in computer systems in national control centres. Time of realization of the estimation calculation should be as short as possible. Accuracy of results of the estimation should be as large as possible. Sensitivity to errors burdening data utilized in the state estimation should be as small as possible. The paper considers the state estimation of a power system with a symmetrical phase shifter. That phase shifter is modelled using a general model of the phase shifter and using specific information on the symmetrical phase shifter. The paper describes original investigations of features of the power system state estimation in both the mentioned cases. Investigations show essential difference between features of the state-estimation for those cases.

## Article Details

*Acta Energetica*, (01), 88–94. https://doi.org/10.52710/ae.111

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