Simulator 16 User Guide - PowerWorld

Contingency Case References
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
MW Transactions
DC and Multi-Terminal DC Lines
Power Flow 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. Note: 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. Therefore, 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.) Note that 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.
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