Weather Dependent Limits Dialog

 

The ability add weather-dependent limits was added in Version 23. The Weather Dependent LImits Dialog is available under on the Tools Ribbon Tab, on the Other Tools Ribbon Group

The Weather Dependent Limits Dialog groups together the features related to entering Weather-Dependent Limits and the objects associated with these features. The dialog has the follow tabs.

• Weather Station: This tab provides a place to define WeatherStations objects. A WeatherStation object represents any location at which weather measurements are specified. See the WeatherStation Objects help topic for more information.

• XY Curve: This tab provides a place to define XYCurve, XYCurvePoints, and XYCurveX which are used to represent the weather-dependent lookup functions such as a temperature-dependent MVA limit of a branch. See theXYCurve, XYCurvePoints, and XYCurveX for more information

• Substation: This tab provides a list of all substations with substation weather-related fields as default columns

• Branch: This tab provides a list of all substations with branch weather-related fields as default columns

• Generator: This tab provides a list of all substations with generator weather-related fields as default columns

Update Branch Limits

See the Branches assignments to WeatherStation and XYCurve options for more information about important branch fields associated with weather such as the TemperatureLimitNormal and TemperatureLimitCTG fields and how a branch determines weather values such as temperature from the WeatherStation and Substation objects associated with the branch.

There are 3 options which impact that function of the Update Branch Limits button.

Normal: Specify which of the 15 MVA limits (A, B, C, ... , M, N, O ) to overwrite with the TemperatureLimitNormal value when clicking the Update Branch Limits button. A value of "Default" may also be specified which signifies that Simulator will overwrite the rating set (A, B, ... O) that is being used for Normal ratings based on each branch's limit monitoring settings.

Contingency: Same as for Normal, but determines which rating set to overwrite with the TemperatureLImitCTG value instead

Precedence: It is possible based on the Normal and Contingency options along with the limit monitoring settings choices that the same rating set (A, B, ... O) will be overwritten by both the TemperatureLimitNormal and the TemperatureLimitCTG. The precedence says which one is applied second (and thus overwrites the first one).

There is also a script command which performs this update with the following syntax.

TemperatureLimitsBranchUpdate(RatingSetPrecedence, NormalRatingSet, CTGRatingSet);

RatingSetPrecedence: is either Normal or CTG. If not specified then Normal is assumed.

NormatRatingSet: If nothing is specified, then Default is assumed. Parameter is specified as either A, B, C, ..., M, N, O or Default as described above. In addition it may be set as "No" to indicate that the normal rating set should not be updated.

CTGRatingset: same as for the NormalRating Set.

 

Filtering features on the Branch tab

There are some special filtering features available on the Branch tab that allow you to show Branches as follows

Only Curves Assigned: Shows only branches for which XYCurves have been assigned and are marked as InUse = YES

Only Changes: Shows only branches that will update limits based on the Update Branch Limits options

Only Conflicts: shows only branches that have a conflict with either the Normal or CTG curve based on the Update Branch Limits options

All: show all branches

 

Update Generator Limits

See the Generator assignments to WeatherStation and XYCurve options for more information about important generator fields associated with weather such as the WeatherMWMin and WeatherMWMax fields and how a generator determines weather values such as temperature from the WeatherStation and Substation objects associated with the branch.

There are 2 options which impact that function of the Update Generator Limits button.

MW Max: check this box and when clicking the Update Generator Limits button the value for WeatherMWMax will overwrite the generator's MWMax field.

MW Min: check this box and when clicking the Update Generator Limits button the value for WeatherMWMin will overwrite the generator's MWMin field.