METHOD FOR REVEALING AND ELIMINATION OF SYNCHRONOUS OPERATION OF POWER SYSTEM Russian patent published in 2007 - IPC H02H3/48 

FIELD: electrical engineering.

SUBSTANCE: the power transmission unit is one of the ends of the controlled section, the voltage and currents are measured in it, the complex values of resistances in the phase-to-phase circuits are computed with respect to the measured voltages and currents, the rate of their variation in time is computed, the voltage frequency is measured, the value is computed and the sign of the rate of frequency variation is determined, the variation of the sign of the rate of frequency variation and the direction of its variation are noted, the computed values are compared with the preset set points, and the sign of the rate of frequency variation is compared with of the rate of frequency variation is compared with the similar one on the opposite end, and the asynchronous operation is noted with positioning of the electrical center of oscillation in the controlled section at the instant of its onset by the symptom of the excess of the coarse set point by value of the rate of frequency variation or by the symptoms of the note of different signs of this parameter at the ends of the controlled section and the excess of the sensitive set point by its value, or at the instant when the angle passes by the value of 180 deg. By the symptom of variation of the parameter sign. In multistep operation the automatic devices form the adaptive control actions on the power system depending on the character of the process of asynchronous operation.

EFFECT: enhanced truth of revealing of asynchronous operation of the power system.

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