Izvorni znanstveni članak

The impact of events in the Slovene high – voltage network on the power quality in the distribution networks

Klemen Deželak ; University of Maribor, Faculty of Electrical Engineering and Computer Science, Slovenia
Andrej Korak ; University of Maribor, Faculty of Electrical Engineering and Computer Science, Slovenia
Tatjana Konjic ; University of Tuzla, Faculty of Electrical Engineering Bosnia and Hercegovina,
Gorazd Štumberger ; University of Maribor, Faculty of Electrical Engineering and Computer Science, Slovenia
Jože Voršič ; University of Maribor, Faculty of Electrical Engineering and Computer Science, Slovenia

Sažetak

This work analyses the impact of different events in Slovene high-voltage network on power
quality in the 20 kV and 0.4 kV distribution networks. In order to perform the analysis a
simplified dynamic model of the Slovene power system was build in the program package
Matlab/Simulink, using toolbox PowerSys. The obtained model is appropriate for simulation
of electromagnetic transients in duration up to a few seconds. It contains simplified dynamic
models of all main generators and power transformers installed in the Slovene power system,
detailed models of 400 kV, 220 kV and 110 kV networks, simplified models of the
neighboring power systems and models of important consumers. The 20 kV and 0.4 kV
distribution networks are modeled in the details only in the area of interests. Everywhere else,
they are represented as constant loads connected to the 110 kV network.
The aforementioned dynamic model was applied to analyze the impact of different events in
the Slovene power system on power quality in the 0.4 kV distribution network during
transients and in steady states. The power quality in distribution network was analyzed on
0.4 kV busbars in five substations (Cerkno, Škofja Loka, Vevče, Šentjur, Rače) for the
following set of events: a switch-off of a 300 MVA (400 kV/110 kV) power transformer in
the substation Okroglo; a three-phase short circuit on 110 kV busbars in the substation Kleče;
a three-phase short circuit on 20 kV busbars in the substation Rogaška Slatina and a switch-on
in a pumping regime of pump-turbine plants Avče and Kozjak which are currently at the
design stage. The results obtained show that aforementioned events in some points of Slovene
distribution network can cause power quality distortion over that allowed by the power
quality standards.

Ključne riječi

Power system – Dynamic Model – Voltage Sag – Simulation – Power Quality

Hrčak ID:

198386

URI

https://hrcak.srce.hr/198386

Datum izdavanja:

19.6.2017.

Posjeta: 523 *