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Sensitivity Analysis

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Hello everyone,

I have been trying to understand the calculation method of the sensitivity analysis function for quite some time now.

The output table displays "sensitivity factor" - how is this calculated?

From my understanding, it shows the MW change in a specific line (for example, or any other selected element) as a function of generation/load changes. The change is relative to a single MW variation.

I have carefully read through the user manual guidance and also used the "sav" file from the PSSE examples, but I arrived at different results from those shown in the manual. Additionally, when I perform manual generation changes, I get different values than those from the automatic run.

Could someone please simplify the use of this function and guide me on how, through manual changes (adding 1 MW of generation), I can achieve identical results to those obtained from the automatic run?

I feel like I'm missing something in my understanding here.

Thank you

Yoyo's avatar
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Yoyo
asked 2025-07-17 05:25:34 -0500
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This function can be a bit tricky to interpret at first.

The key point is that the sensitivity analysis in PSSE is based on a linear approximation. That means it calculates how a small (infinitesimal) change in generation or load would affect the flow in a line, bus, etc., assuming the system remains linear around the operating point. When you manually change the generation by 1 MW, you're introducing a finite (non-infinitesimal) variation, so the result may differ slightly from the linear approximation used in the

Also, when you inject +1 MW into the system (e.g., at a generator), PSSE assumes there's a balancing -1 MW taken from another source—typically the slack bus, but depending on your settings, it might be another generator or load.

jbarberia's avatar
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jbarberia
answered 2025-07-17 21:52:45 -0500
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