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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?
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.
