This master thesis addresses the field of electric power system stability and presents a dynamic analysis of the Krško nuclear power plant (KNPP) under the influence of system disturbances. The main objective is to develop a sufficiently relevant model of the KNPP control system in the Netomac software tool and to analyze the behaviour of the plant under various disturbance scenarios. In the first part of this paper, a theoretical background is introduced and a classification of power system stability is briefly described. This is followed by the basics of power system control and a more detailed discussion of turbine and voltage regulation of a power system with the associated simulation models. The second part presents turbine and voltage regulation modelling of the KNPP in the form of control schemes. This includes a set of input control parameters. Afterwards, the simulation results for each set of disturbances are presented. It was found that the Krško power plant is successfully kept in operation in all cases of disturbed functioning. However, the disconnection of the power plant was not modelled, since the frequency protection is not implemented in the dynamic model. Therefore, the conclusions are based on the analysis of physical quantities from the respective diagrams. The study has also revealed unstable behaviour of two regulation systems in the Šoštanj thermal power plant (gas turbines PB1 and PB2), which caused oscillations in other power plants in the system. At the end, the conclusions and summaries are presented.
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