Why to give a large MVA to this infinite machine and set its Xs = 0.01 or less when representing an SMIB ?

asked 2024-02-20 20:20:29 -0500

gabriel_ipu
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I'm trying to compare dynamics results with other software, and it only matches when i do this, why i would give a large MVA to an infinite machine ?

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answered 2024-02-21 11:15:56 -0500

perolofl

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The short circuit power from a generator can be estimated to Mbase/Zsorce. Hence, a large Mbase and small Xsorce will lead to a very high short circuit power contribution to the bus, i.e. an infinite bus!

For example, Mbase=10 000 MVA, Xsorce=0.01 --> Short circuit power = 10 000/0.01 = 1 000 000 MVA.

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Asked: 2024-02-20 20:20:29 -0500

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Last updated: Feb 21

Why to give a large MVA to this infinite machine and set its Xs = 0.01 or less when representing an SMIB ?

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