On measurement of synchronous phasors in electrical grids

Precise estimation of frequency and phasor has become important in electrical power grids. Knowledge of phasor enables localization of faults, calculation of active and reactive power flows, determination of electrical parameters of system components (lines, transformers), etc. In this paper we present a new method for frequency and phasor assessment. Frequency assessment is done by applying statistical methods such as minimizing standard deviation of moving averages for the window length corresponding to possible frequency. Phasor assessment is done using numerical quadrature. The algorithm has been developed using Wolfram Mathematica^® and implemented in development board equipped with a microcontroller.