This thesis presents an analysis of the voltage profiles of the medium voltage substation KB PRISTAVA : K143 due to the impact of solar power plants. Solar power plants are increasingly spreading throughout the power system, where they are leaving a growing impact on the system.
The most significant impact is the increase in the voltage of the low and medium voltage grids when the grid is saturated with solar power plants. Grid operators now have to be even more vigilant to ensure that voltages are within the permissible limits set by the standards. In order to maintain standard voltages, it is absolutely necessary to renew the grid and to set low voltage transformers to the correct operating level in line with the grid conditions.
The thesis will therefore consist of a presentation of the operation, connection and operation of solar power plants, a presentation of the problem of voltage rise due to the influence of dispersed sources of electricity and a brief presentation of the network of Elektro Celje, d.d. in the area analysed.
The voltage profile analysis itself consists of two parts, where I first looked at the voltage conditions at different times of the year, when solar power plants have different operating conditions. The second part of the analysis presents the voltage profiles throughout the day on two days with different solar irradiation.
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