Contingency Case References

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Contingency Analysis always stores a Reference State or pre-contingency state. The Reference State stores information pertaining to various network objects and solution options. See Reference State Information for details on the specific information stored.

The reference state is loaded into memory prior to the execution of each contingency during automatic processing of the contingency list. This ensures that all contingencies start from a common Base Case. Furthermore, the system is set back to the reference state following completion of the automatic processing. The system is not restored to the reference state when the Solve Selected Contingency option is selected from the Contingency Record Display’s local menu (see Reference State Solution Options for more information).

The reference state is always stored in Simulator after the first instance of opening the contingency analysis form, with a few exceptions. If you switch to Edit Mode or add or delete MW Transactions between areas, the contingency reference state will be destroyed. If the reference state is still in memory, opening the contingency analysis again may result in a prompt from the program. This prompt will ask you if you wish to set the contingency analysis reference state to the current state of the system (in case you have made changes since the last contingency analysis run), or if you wish to keep the existing contingency analysis reference state (which was set by previously opening the contingency analysis dialog.) If you choose the second option, any changes you may have made to the case outside of the contingency analysis will be lost, as the reference state stored with the contingency analysis tool will reset the system state to the reference state.

Click here for information on defining the reference state.