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Well I'm trying to do some small-signal studies, and i'm familiar with the deMello-Concordia linearized model. As far as i know all the constants used in that model (K1-K6) depend on the system, and so they change as the system changes too. I have a large system with several synchronous machines and i want to obtain the SMIB model for one of those machines. So how do i obtain the external reactance connected to the infinite bar, representing the transmission line? I know this reactance corresponds to the Thevenin equivalent, but is there a way to obtain this value by using a power flow simulation software?

Or is it a good approach to assume this value to be zero?

Thanks a bunch

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# Single machine-Infinite bar (SMIB)

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