Examination of short-circuit calculation methods of different power system simulators

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Dr. Hartmann Bálint
Department of Electric Power Engineering

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.


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