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ACCC is AC contingency analysis. PSS/E has DCCC which is DC based contingency analysis. ACCC accounts for Mvar while DCCC does not. Instead of doing manual contingencies, ACCC offers automatic reading of sav, and auxiliary files.

You need a solved case, a monitoring file (.mon), a subsystem file (.sub file), and a contingency file (*.con). The manual provides edetails of these files. In ACCC, you need to create a distribution factor file (dfax) from the mon, sub and con files before running the main ACCC simulation. THe output will be in *.acc file and you can read the output in PSS/E, and export to text or excel file.

HTH.