The thesis is about the power system simulators, system modeling and short
circuit current calculation. The task is to compare two power system simulators regards of
modelig or short-circuit calculating. The chosen simulators to test are PowerWorld Simulator
14 and PSS/E 32. The first task was the building of the sample network in the softwares. I
rewieved the process of modeling, choosing models and calculating the parameters. The
results of the power flow analysis helped me to decide whether the network models are in
range with each other. Before the short circuit calculations, some by-pass subject were about
other useful functions of the simulators, for example optimal power flow, transient stability,
N-1-1 simulation or customizing of built-in models. I dealt with short circuit calculation
methods in detail, particularly with the well-known IEC 60909 international standard. I listed
some functions in aspect of short circuit calculations not essential to the thesis results.
Models were prepared for the short circuit simulation after filling the right parameters.
During the examination of the short-circuit calculation results I established, that though the
tendencies are similar, the results differ sightly. The absolute value of the currencies of the
short-circuit calculations were lower int he simulator PSS/E than PowerWorld. The reason
can be the deflection of the models of 3-winding transformer. The results can help designers
to choose between power system simulators. The choice highly depends on the viewpoints,
but some conclusion can be drawn from this comparison as well. A more detailed
examination can be accomplished in the direction of dynamic changes or by using more
compared power system simulator.