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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.
