Application of Unbalanced Faults in Positive Sequence Dynamic Simulation

Anonymous

My idea here is that, i will run a short-circuit analysis for the system under study using a different program and will get the single phase short circuit MVA values. I will compute for the pu impedance associated with the short circuit MVA value and apply it as a fault impedance in the PSSE dynamic simulation to emulate unbalanced disturbance.

May i know if someone here in the group did the same way? Otherwise, can you share your ways on modeling unbalanced faults in PSSE positive sequence dynamic simulation? Thanks.

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answered May 25 '17

lmcqueen
66 ●34 ●37 ●40

Thanks perolofl for this suggestion. I am familiar with this SCMU activity in PSS/E.

On your question, why use another progam to calculate unbalanced faults? It's because majority of the utilities prefer a short-circuit program other than PSS/E.

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answered May 25 '17

perolofl

3452 ●1 ●9 ●20

Why use another program when you can do it directly in PSSE!

It is easy if sequence data are present in the saved case used for dynamic simulation. Then just select dynamic disturbance "Calculate and apply unbalanced bus fault". PSSE will automatically calculate the equivalent positive sequence fault admittance and insert it as fault admittance at the faulted bus.

If sequence data are not present in your dynamic saved case you can do a separate SCMU-calcúlation with a saved case containing the necessary sequence data (negative and zero sequence) and use the reported "POSITIVE SEQUENCE EQUIVALENT FAULT ADMITTANCE" as fault admittance in dynamic disturbance "Bus fault".

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Application of Unbalanced Faults in Positive Sequence Dynamic Simulation

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