Study of the Accuracy of Signal Phase Estimation by Piecewise Overlay Method in the Emergency Mode

The rate of development of emergency mode in energy systems, as well as their harmonic composition, significantly affects the operation accuracy of the automation systems. The study of accuracy and computational resources of piecewise overlay method for searching harmonic signal phase was conducted in this paper. The simulation of a signal phase in emergency mode was conducted in Matlab by using experimental and theoretical data of dependences of a periodic signal on time. Based on the simulation, as well as the analysis of experimental data on the development of short-circuit currents in the energy system, the influence of rise rate factor of a periodic signal, the width of the sampling window on the accuracy of determining the phase were studied.