METHOD FOR DETERMINING THE BASIC FREQUENCY STRUCTURAL VOLTAGE OF A POWER SUPPLY NETWORK Russian patent published in 2018 - IPC G01R23/00 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, in particular to the determination of phase-to-phase voltage parameters of three-phase electrical networks. Method for determining the instant value of the main frequency component of the supply network voltage is that a constant frequency component T_dω. Based on the incoming and nominal phase voltage signals, quadrature voltage signals are generated by determining the signal U_β, ahead of the incoming phase voltage signal with frequency limitation of higher harmonics in the specified range, and forming a signal U_α, which is in antiphase to the incoming signal of phase voltage. Generated signals are passed through a first-order filter configured to filter higher harmonics and store the signal quadrature. Received signals are passed through a second order filter where lower range harmonics are filtered and signals are generated with information about the instantaneous value of the main frequency component of the phase voltage of the mains and its amplitude. Determine the instant value of the amplitude U_m and perform a phase adjustment, at that the values characterizing the position, the phase and amplitude corrected signals are determined and also help to determine the instant value of the main frequency component of the voltage of the supply network U₁.

EFFECT: technical result consists in increasing the speed and accuracy of the phase-by-phase determination of the instant value of the main frequency component of the mains voltage.

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