In isolated power systems for energy-intensive consumers with changing power consumption, there is a need to investigate how different operating and consumption modes influence the system parameter and quality of electricity. This issue is relevant for power systems, which include energyintensive consumers with changing power consumption. The load diagram of mentioned consumers has stochastic nature with the average value of about 1/4 -1/5 of generator units rated power. Such operation mode

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... rsely affects the specific fuel consumption of the generator. In addition, an abruptly variable load can cause (or enhance) low-frequency oscillations (LFO) in the power system. The energy storage system (ESS) is an effective tool for solving the problem of full or partial compensation of load fluctuations. This paper shows the research results of application of storage, based on a supercapacitor for lowfrequency oscillations damping in the isolated power system. Calculations are performed with a help of the MATLAB/Simulink software package. A technique for choosing ESS parameters is developed. Keywords-abruptly variable load; energy storage system; isolated power system; power system stability; electricity quality; supercapacitor Actual Issues of Mechanical Engineering (AIME 2017)