Analysis of high-amplitude low-frequency oscillations using data from phasor measurement units

Abstract

Low-frequency oscillations (LFO) of power are constantly present in the power system, while an increase in the amplitude of the LFO significantly reduces the reliability of its operation. The presence of high-amplitude LFO in the parameters of the electric mode can significantly reduce the permissible power flows, lead to a decrease in the margin of static stability, and under adverse circumstances, to a violation of static stability and the separation of the power system into isolated parts. For this reason, in many dispatch centers around the world, continuous monitoring of the frequency, amplitude, phase and damping coefficient of low-frequency oscillations of the frequency and power in the power system in real time using data from phasor measurement units (further in text - PMUs) is organized. Actual information on the level of LFO in the power system will allow to control the occurrence of high-amplitude synchronous swings of active power in the power system for their timely elimination and to control the violation of stability.