In order to perform any types of studies, simulations and tests on large interconnected power systems having a simphified model of such systems is necessary. Dynamic studies of power systems need dynamic equivalents The first stage of dynamic equivaincing is to simplify primary power system based on the results of load flow studies.This paper, Presents a simiplified model of Electric power system of Iran as a typical system accompanied with complete data, for the purpose of dynamic aggregation and any other static or dynamic studies

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