Contingency Options: Injection Sensitivities

 

These options are available on the Contingency Analysis dialog under the Contingency Options tab under the Modeling grouping.

 

The injection sensitivities options are used to calculate shift factors and/or MW effect of changing generation and load injection for individual contingency violations. These can be used to determine potential generation and load changes needed to reduce loading on violated branches and interfaces.

 

Sensitivities to Retain

These options determine how many shift factors to report for each violation. When saving both generators and loads, the number of results can include BOTH generators and loads, and the options do not specify the number of each to save. To save a particular number of results for a particular type of injector, the other type of injector must be excluded.

 

Keep Highest Sensitivities

Specifies how many results are kept for each violation based on the calculated injection sensitivities. The injection sensitivities determine how the flow on the violated element will change due to an injection of MW at the specified generator or load. The results will include the X maximum, where X = Keep Highest Sensitivities, and X minimum sensitivities.

Keep Highest MW Effect

The MW Effect of an injector device determines how increasing or decreasing injection from that injector will cause the MW flow on the violated element to decrease. This option specifies how many results are kept for both the impact of increasing and decreasing injection. The most negative X, where X = Keep Highest MW Effect, MW effects will be kept for both increasing injection and decreasing injection. The amount of injection that can be increased or decreased for a particular injector is determine based on the MW limits for the injector. For a generator the increase in injection is the difference between the maximum MW and present MW for the generator. The decrease in generator injection is the difference between the minimum MW and the present MW. Loads typically do not have maximum and minimum MW limits specified, and they will be ignored even if they are specified. The increase in load injection will be the present output of the load. The decrease in load injection will be 0.

 

Eligible Generators

For the impact of a generator to be considered for inclusion in the results, the generator must meet the specified filter. The following options are available for filtering:

None

No generators will be considered.

All

All generators will be considered.

Online

Only online generators will be considered.

Area/Zone/Owner Filter

Only generators meeting the Area/Zone/Owner filter will be considered.

Selected

Only generators whose Selected field is YES will be considered.

Filter

Only generators meeting the advanced filter will be considered.

 

Eligible Loads

For the impact of a load to be considered for inclusion in the results, the load must meet the specified filter. The following options are available for filtering:

None

No loads will be considered.

All

All loads will be considered.

Online

Only online loads will be considered.

Area/Zone/Owner Filter

Only loads meeting the Area/Zone/Owner filter will be considered.

Selected

Only loads whose Selected field is YES will be considered.

Filter

Only loads meeting the advanced filter will be considered.

 

Reporting Results

The sensitivities for all violations for all contingencies are reported in the Violation CTG Injection Sensitivities case information display.

 

For individual violations that are reported in the Contingency Violations Display, fields can be added to show all of the available sensitivities for that violation. The fields that are available can be found in the Sensitivities\Injection Sensitivities folder in the list of available fields for the LimitViol object type. A local menu option, Show Violation CTG Injection Sensitivities, exists with this case information display to show a case information display of only the sensitivities for the selected violation.