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Hi everyone, When we need to do ACCC, first need to create a distribution factor file.

Here is what I know from the PSS\E manual: Input for the process of creating the Distribution Factor file is contained in three data files: • Subsystem Description Data file; relevant subsystems of the working case are specified in this *.sub file. • Monitored Element Data file; network elements to be monitored for problems are specified in this *.mon file. • Contingency Description Data file; contingencies to be tested are specified in this *.con file.

My understanding is as follows: -Subsystem description file describes the system you want to run contingency analysis using ACCC. You can either include the whole system defined in your working case or .raw file or just specify a subsystem (i.e. using just some specific areas to define a new system you would like to work on, and ignore the rest of the original system as if the rest of system doesn't exist -- I cannot think of an realistic situation for this case though)

-A monitor element data file describes those elements that you want to monitor when you run ACCC. I guess ACCC solution file (i.e. .acc file) will only record the results for these specified elements in the subsystem you defined in the .sub file - maybe that is the purpose of this file -- to save computing time and resources.

Take my case as an example --- I need to do ACCC for a large system consisting 50 areas, but only interested in monitoring those branches and buses residing in areas 1-20. Then the original whole system (including all 50 areas) will by my subsystem, but in the .mon file, I only need to include those branches and buses in the areas 1-20. Basically, monitor file always contain less or equal number of elements than the subsystem. Of course monitor file only include those elements,but subsystem contains the whole topology and other physical information/parameters of the system.

-As for the contingency file, its meaning is very straightforward.

I would like to hear your comments. Please correct me if I am mistaken.

Thanks very much for your help in advance