Synchrophasor Evaluation Based on Point-on-Wave Measurements

Abstract

The accelerated synchrophasor measurements algorithm is presented. The algorithm allows to evaluate synchrophasors with less than one basic frequency cycle time delay. The reference points method was suggested to determine the synchronous frequency, with magnitude and phase being calculated by means of extrema interpolation. Tests were carried out using the simulation data and the real data of the 110 kV, 220 kV, and 500 kV grids steady states and transients. Requirements for time delay of the suggested algorithm and sampling rate of the initial measurements data were formulated. The total vector error minimum was selected as the optimality criterion. Since the algorithm was tested on the real data without actual reference values, the alternative method of defining the total vector error was proposed. The suggested algorithm can be applied to protection & control systems based on the reactive action (the so-called “1-After” concept, when the set values of protection & control systems are calculated after a disturbance), development of dynamic power system models and generators technical state assessment.