Simulator 16 User Guide - PowerWorld

Note: The Refresh Displays after Each Contingency option (lower right) can slow down the
analysis significantly when running a long list of contingencies.
The contingency analysis results are sorted on the contingencies tab in descending order by worst
violation. We see that there were three violations resulting from the contingency analysis (one for each
of the first three contingency records displayed) and that no unsolvable load flows resulted (as shown
in the Status Section of the Contingencies Tab.) If you enlarge the Contingency Analysis Dialog (by
dragging either side or the corner of the pane) you see more information in the Status Window,
specifically, "Finished with 3 Violations and 0 Unsolvable Contingencies. Initial State Restored."
Contingency Analysis always stores a Reference State or pre-contingency state. The Reference State
stores information pertaining to: buses, switched shunts, limit groups, loads, branches, generators,
areas / super areas, and power flow solution options.
Both prior to and following completion of solving a list of contingencies, the reference state is loaded
into memory. This ensures that all contingency analysis solutions start from a common base case and
that the system is restored to its initial state following a solution. The last sentence in the Status
portion of the dialog, "Initial State Restored," tells the user that the simulation case was restored to
the reference state upon completion of the Contingency Analysis Run. See Contingency Case
References for more information on the Reference State.
The Violations Section (lower left) of the Contingencies Tab provides a description of each violation
resulting from the execution of the contingency selected in the list of contingencies. Scroll through the
list of contingencies to view information about the resulting violations for each.
Note: You can hide the Contingency Definition section of the Contingencies Tab by clicking the
button.
©2011 PowerWorld Corporation
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