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Abstract
The article deals with the issue of the influence of solar power plants on the operation of relay protection and automation devices. The development of simulation models of electric power systems in the Simulink MATLAB environment has been carried out for three cases: power is supplied entirely from a solar power plant; power is supplied from the traditional source of the electric power system; the power is supplied partly from the solar power plant, partly from the traditional source of the electric power system. The description of the main parameters of the blocks of the simulation model is made. A study was also made of the influence of renewable energy sources on the sensitivity of relay protection, which directly depends on the level of short-circuit currents. Graphs of the dependence of the two-phase short circuit current on time are plotted. The conclusion is made about the decrease in the sensitivity of the relay protection in the presence of a solar power plant in the electric power system. The results obtained make it possible to calculate the parameters of various operating modes of the system, the results of which can be used to configure relay protection and automation devices.
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