Simulator 16 User Guide - PowerWorld

Comparing Contingency Analysis Results
After performing an automated contingency analysis, the results of the analysis can be saved to an
auxiliary file. Once the results have been saved to a file, they can then be compared to different
results in another file or to results existing in memory in the Contingency Analysis tool. To compare
two sets of contingencies, do the following:
Process each set of contingencies and save the results for at least one set in an auxiliary file.
o To save a contingency list, right-click on the list of contingencies and choose Save As >
Auxiliary File.
o In the Save Contingency File Dialog, choose a name for the file, and then click Save.
o You will then be prompted to choose options for saving the contingency list to an auxiliary
file. By default, the contingency definitions themselves are saved, along with the
contingency options. The optional information you may choose to save are the Limit
Monitoring Settings, General Power Flow Solution Options, List Display Settings, and
Contingency Results. When saving the contingency results with the file, you may also
choose to include inactive violations.
Inactive violations are considered violations on elements for a DIFFERENT limit than what is
currently being monitored. For example, a branch may have an A limit rating of 50 MVA,
and a B limit rating of 100 MVA. Consider if the B limits are being used to report violations
during a contingency. A value of 75 MVA flow on the branch would not be reported in the
contingency analysis as a violation, considering the B limit of 100 MVA is being used.
However, Simulator internally will flag the element as a potential violation if the limit set
used is switched to the A rating set. Simulator considers these types of situations as inactive
violations. These are kept track of to allow the user to easily switch the rating set used for
reporting violations from one set to another and see the results immediately, without having
to re-run the entire contingency set to determine the violations for the new rating set.
Choosing to include the inactive violations when saving an auxiliary file maintains this
flexibility when the contingency definitions and results are read into a case from an auxiliary
file. You can also choose for the identifiers used in the file to be either the bus numbers or
the bus name and nominal kV voltage.
Note: For comparing two lists of contingency results, you MUST save the contingency
results with each of the two auxiliary files being compared.
o Click OK to save the contingencies and the results to the auxiliary file specified.
Once you have two different lists of contingency results (at least one of the lists must be saved in
an auxiliary file), right-click on the contingency list and choose Compare Two Lists of
Contingency Results or choose Other > Compare Two Lists of Contingency Results. This
will bring up a dialog on which you have to specify the Contingency Lists you are interested in
comparing. You must specify the Controlling Contingency List and the Comparison
Contingency List. The definitions of these two lists are found below.
Click on the Browse buttons to specify the two Contingency Lists you would like to compare. You
can also choose to use the presently open Contingency List as either the Controlling Contingency
List or the Comparison Contingency List.
Controlling Contingency List:
The list that controls what is displayed on the dialog. Only contingencies that are defined in this
list will be displayed on the form. Only violations that occur for contingencies in this list will
appear in the Violations List for each contingency.
Comparison Contingency List:
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