FIELD: electrical engineering.
SUBSTANCE: according to the method, from the voltage measurements on the side of the system buses and from the power transmission line side corresponding digital signals are generated and the complex frequencies of the digital signals are determined by the method of adaptive structural analysis. Digital voltage signals are converted into homogeneous complex predictive signals by converting digital voltage signals by a filter of orthogonal components to signals of complex amplitudes of its components, each of which is then supplied to corresponding input of filter-predictor, made in form of adder, which output is filter output, and inputs of adder are connected to filter inputs through corresponding amplifiers, complex amplification factors of which are changed in time according to exponential law with argument, which is proportional to value of complex frequency of corresponding component. From said complex predictive signals, a complex predictive voltage signal is generated at contacts of the switch and a predictive signal of its envelope. Minimum predictive envelope signal is found and two transitions of the voltage curve at the switch contacts through zero are predicted by determining the corresponding moments of change of the sign of the imaginary component of the complex predictive voltage signal at the contacts of the switch. Inclusion moment is selected near one of the found moments, to which the smallest value of the predictive signal of the envelope corresponds. By the condition of dynamic stability preservation, the search for the minimum of the predictive envelope signal can be carried out at a given time interval. Filter of orthogonal components is possible in the form of a Fourier filter or based on the method of component analysis.
EFFECT: technical result consists in improvement of reliability of automatic re-connection of power line with shunt reactors and reduction of level of overvoltage.
4 cl, 11 dwg
