Practical experience in monitoring low-frequency oscillations at electric power station of United Power System of Russia

\nThe development of the Wide Area Measurement System (WAMS) in the United Power System of Russia has provided the opportunity to use phasor measurement unit (PMU) data to solve practical problems in operational dispatch management [1]. One of the most significant tasks is monitoring low-frequency oscillations (LFOs) to prevent and eliminate violations of the normal operating mode in the energy system of Russia [2]. Long-term, weakly damped, high-amplitude oscillations can lead to oscillatory instability in the power system, causing massive generation and load shutdowns, separation of the system into isolated parts, and cascading technological disruptions. Based on PMU technology, a powerful tool for monitoring low-frequency oscillations and identifying their parameters and sources in real-time has been developed and integrated into the control rooms of the System Operator. This article presents the fundamental principles of this monitoring system and describes the algorithms used to identify the sources of low-frequency oscillations. It also provides practical examples of low-frequency oscillation monitoring at power plants carried out by specialists from the System Operator.\n