Abstract
It is proved that the use of devices which measure the decrease of the frequency ensures the requirements of the emergency of frequency oscillations. Setting reasonable terms of automation, which uses a similar device. According to the results of the analysis "Ukrenergo" has developed a new version of the document "The use of emergency control system to prevent and eliminate or reduce the dangerous frequency increase in power systems", which address the issues of practical implementation of the AFU-S. The effectiveness of AFU-S demonstrated by the emergency department of the Kiev region of UPS of Ukraine. References 4, figure 1.
References
Аvramenko V.N., Krylov V.A., Chernenko P.A., Pryhno V.L. Mathematical models and software tools for solving problems of automated supervisory control of power systems. − Kiev: Institut Elektrodinamiki Natsionalnoi Akademii Nauk Ukrainy, 2012. − 303 p. (Rus)
MOA 34.20.567-2012. The use of emergency control system to prevent and eliminate or reduce the dangerous frequency increase in power systems. Rules. – Kyiv: Ministerstvo Palyva ta Enerhetyky Ukrainy, 2012. (Ukr)
Rabinovich R.S. Automatic frequency unloading of power systems // Moskva: Energiia, 1980. – 344 p. (Rus)
19. ENTSO-E Operation Handbook. P1 – Policy I: Load-Frequency Control and Performance. Available at: https://www.entsoe.eu/fileadmin/user_upload/ _library/publications/entsoe / Operation_Handbook/Policy_1_final.pdf. − 33 p.

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