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Here's my experience with OPF in PSS/E.

I was optimizing the shunt capacitor size and location. In OPF, I defined the candidate buses with base case plus contingencies. When OPF provided the shunt compensation location and size, I simulated the case with the shunt capacitor in place and applied the contingencies, if any, and see if the voltages would be at acceptable magnitudes per criteria.

This is a good check if the OPF "really" gave the optimal capacitor size and location.