The cases of occurrence in 2016-2017 in the Interconnected Power System (IPS) of Ukraine the low-frequency oscillations (LFO) of IPS operational condition parameters were studied, and identification results of LFO modes are presented. These results testify to influence of the IPS's circuit and operational conditions upon the composition and frequencies of LFO' dominant modes. During these studies the results of phasor measuring of IPS operational condition
The article presents comparative identification results of low-frequency components of the signals in the cases of using their both effective and instantaneous values. It is shown that using of instantaneous values of power system operational condition parameters measured by phasor measurement units will increase a detection reliability of low-frequency modes of electromechanical oscillations, however, such use in real time will require a high processor speed. Therefore, for reliable detection of low-frequency modes it is more expedient to increase the observation window's width and to use the effective values of the power system operational 1 / 3 2017 n5 s10 condition parameters. References 10, figures 6, tables 3.
The analysis results of the composition changes' impact in the power systems' (PSs) generating capacities on natural frequencies and electromechanical transient processes in the PSs are given. The cases when specified changes are a consequence of the introduction of generation sources groups which will partially replace the generating capacities of thermal power plants were considered. In this research well-known test two-area (4-machine) and 6-machine PS schemes were used. References 10, figures 5, tables 3.
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