See Also
Added in Version 20
These options are all available on the Contingency Analysis dialog under the Contingency Options tab under the Island Monitoring grouping.
Prior to Version 20, Simulator would report a contingency as Solved=NO if any island in the case did not successfully converge to a power flow solution. This meant that if you had a large system and your contingency split an electrical island into 2 islands, even if the new island had only a handful of buses (or Superbuses), then the entire Contingency would be flagged as Solved=NO. There is now an option available in the Simulator Options dialog called Evaluate Power Flow Solution for Each Island. Choosing this option will force Simulator to continue a power flow solution as long as at least one island continues to converge. Upon completing the contingency solution, the following options may then be used to report violations about islands.
Report Violations for Islands
Check this box to choose to report violations for any islands that either do not solve during the solution, or any islands that do not have enough generation MWreserves during the solution. These will appear as a special category of contingency violation called Island Unsolved or Island Reserve Limits. In addition to these, any new islands that are created as a result of the contingency will also be reported as a special category called Island Solved. Also, you may restrict it so Simulator does not report these special islands for small islands as defined by the following two options.
Minimum Load MW to report an island violation
Only report island violations if the total online load MW in the island is at least this amount.
Minimum number of super buses to report an island violation
Only report island violations if the total number of super buses in the island is at least this amount. For system which are not using Integrated Topology Processing, this would just be the count of the number of buses in the island instead.