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Bus Frequency Output

asked 2021-09-23 08:17:43 -0500

GriffinA gravatar image

updated 2021-09-23 08:18:17 -0500

I am trying to test the frequency response of a system. After I run a simulation and view the frequency of the system from the output file I am essentially getting 0 for the frequency of the system.

I set the base value of the system at 60Hz so shouldn't my frequency be 60Hz in the output file without any faults placed on the system? I am trying to run a Over/Under frequency trip test but I can't even get a frequency reading of greater then 0.

Does anyone know how I can generate an actual frequency reading? I can't find any setting in the save file or dynamic file that will fix this issue so maybe it is my PSSE seetings?

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answered 2021-09-23 13:47:38 -0500

perolofl gravatar image

The speed channel in PSSE is in per unit speed deviation. Nominal frequency (60 or 50 Hz) is zero pu deviation. Positive pu speed deviation means overfrequency and negative means underfrequency.

Example: 61 Hz is (61-60)/60 pu speed deviation.

When plotting, use a formula and calculate (1+spd)*60 to get the channel value in Hz.

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Asked: 2021-09-23 08:17:43 -0500

Seen: 47 times

Last updated: Sep 23