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Check my posting in "Can anybody help me with PV analysis in PSSE please?" Study the files and scripts to follows its process.
The PSSe PV engine uses a transfer file to define groups of generators and loads to establish a (incremental) power transfer path. For example, you can have generators in area 1 and loads in area 2 or all generators in base case sending power to all loads in area2. My example PV data set also contains a script to export PV results to Excel, for easy plotting. Also,search the net for PV analysis tutorials.