Calculating centre of inertia frequency, scaling?

asked 2018-03-15 09:35:04 -0600

Anonymous

Hey there,

I have code that acquires all frequencies and is used to find COI frequency to find ROCOF on COI frequency, so I can use the ROCOF to estimate system inertia when certain contingencies occur.

To make COI frequency, I need to scale the machines' frequency contribution. I do not understand what Mbase is. Is it equivalent to inertia constant or rated power? If not, how can I get these two values from PSSE? I've spent so long looking around.

Thank you for your time.

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answered 2022-11-16 14:26:41 -0600

Berwin

103 ●2 ●3 ●10 https://psspy.org/psse...

From the dyanmic data of the machienes avalilable in you network, you can just multiply the Inertia constant with the MVA rating of the machine. Do the summation of the all the generators to get total inertia of the network,