Ignoring contingent elements within interface definitions allows for a determination of the impact of other contingencies on the flows of the non-contingent elements forming the interface, without impact from additional contingent element considerations. It is not uncommon to ignore the impact of contingent elements when using the contingency analysis or security constrained OPF tools, as they are already processing lists of contingencies and evaluating flows on interfaces. You can choose to never include the impact of contingent elements on interface flow, to only include contingent element impacts in the standard power flow or optimal power flow routines, or in all solution routines including contingency analysis and security constrained OPF. This global location allows you to determine how contingency elements in an interface should be treated in Simulator. Monitor/Enforce Contingent Interface Elements If the bus sensitivities are set to User-Specified, the sensitivities will remain at their last calculated values, according to the loss function type previously specified when the loss sensitivities were calculated.
If the case consists of only one island, which, by definition, corresponds to the entire system, then the bus loss sensitivities are measured with respect to total system losses.
Here you may choose to forego the calculation of bus loss sensitivities or to base them on island losses or area losses. Changing this value will update all of the internal structures to store the proper values on the new base.īus loss sensitivities indicate how island or area losses change with power injection at the bus. Click on the Change System Base button to change this value. By default, this value is set to 100 MVA. This option allows the user to specify the MVA base to be used for the entire case. The following options are all contained on the General tab after choosing the Power Flow Solution page of the Simulator Options.
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