Correction for the deviation of power system frequency in the measurement of power by digital techniques

Abstract

The saturation of power supply systems with nonlinear and powerful sources both from sources and consumers of electricity has led to the fact that signals in the network become non-stationary, nonlinear, and with significant frequency fluctuations. The purpose of the work is to reduce the methodological error of determining the parameters of the mode of electricity consumption due to the frequency deviation in the electrical network. The article proposes methods based on the determination of the frequency deviation value and the introduction of correction coefficients (for example, the calculation of active power and voltage in the electric network). The proposed methods are applied to both sinusoidal and non-sinusoidal signal forms. The results show that these methods have high accuracy, even with signals containing harmonics, and for a frequency deviating from the nominal value.