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Being the stiffness of the grid its capability of maintaining the voltage constant despite small variations on load. Whereas, a weak grid would be easily affected by load variation and the voltage would change.

So here it comes my question, how do you quantify how stiff a grid? Is there any formula to calculate this?

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  • \$\begingroup\$ 1) Measure, or simulate. 2) As a simulation is essentially the same as an approximate formula, you could say yes. \$\endgroup\$ – Brian Drummond Dec 31 '19 at 13:51
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The eigenvectors of the stiffness matrix are called modes and span a feature space. But this is never measured for the "grid" . However impedance and load regulation can be measured.

You can use the term loosely with analogies, but technically it is not measured or defined.

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