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This paper presents the possibilities and practical features of a computer program for fast assessment of the effects of primary frequency regulation of electric power interconnections. It is based on two methods. The first one is the analytical method, which applies analytical expressions for the non-zero initial conditions, with a range of benefits provided by the analytical form, allowing consideration of possible structural changes in the power system during the analysis process. The second is a simulation method, with recurrent application of suitable drafted, fully decoupled difference equations. Capabilities and features of this computer program have been identified in case of isolated power system of Serbia, and then for the case of a widespread appreciation of its surrounding

Characteristics and possibilities of computer program for fast assessment of primary frequency control of electric power interconnections