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Simulator 16 User Guide - PowerWorld

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Limit Group Dialog<br />

The Limit Group Dialog reflects much of the same information that is summarized in the Limit<br />

Monitoring Settings Dialog’s Modify/Create Limit Groups page. The same information can be<br />

changed here as on the previously mentioned display. One important feature that is unique to this<br />

dialog is the ability to define a piecewise linear limit cost curve, which can be used for setting up "soft"<br />

constraints used in the Optimal Power Flow.<br />

To access this dialog, right-click on one of the limit groups defined on the Modify/Create Limit<br />

Groups page of the Limit Monitoring Settings dialog and choose Show Dialog.<br />

Limit Group Name<br />

Identifies the name of the Limit Group that is currently selected. Select a different limit group from<br />

the dropdown to modify parameters for that group.<br />

Disabled<br />

Check this option to ignore all power system element limits in the Limit Group. Leave the box<br />

unchecked to monitor limits according to the settings of the Limit Group.<br />

Add New Limit Group<br />

Clicking this button will create a new limit group, displaying a dialog in which the name for the new<br />

limit group can be specified.<br />

Rename Limit Group<br />

Clicking this button will display a dialog in which a new name for the current limit group can be<br />

specified.<br />

% of Limit for Reporting (Branches)<br />

©2011 <strong>PowerWorld</strong> Corporation<br />

Lines/Interfaces<br />

The percentage to which <strong>Simulator</strong>’s study tools will limit a line or transformer. Typically this is<br />

100%, but it can be modified. In Contingency Analysis, lines will be flagged as violated if they<br />

exceed this percentage. In performing an Optimal Power Flow, all attempts will be made to keep the<br />

line below this percentage.<br />

Line/Transformer Rating Set<br />

You may define eight different ratings to transmission lines or transformers (for more information<br />

see the Branch Information Dialog or Branch Options dialog). Change this value to specify which<br />

rating set should be used for lines/transformers in the limit group.<br />

Line/Transformer Contingency Rating Set<br />

This field specifies the rating set used for post-contingency monitoring of Lines/Transformers.<br />

Treat Transmission Line Limits as Equivalent Amps<br />

Limits for transmission lines and transformers are always entered in MVA. However, when reporting<br />

limit violations, it is common to check transmission line limits in terms of their amp loading. If the<br />

Treat Line Limits As Equivalent Amps is checked, the limits for transmission lines are reported in<br />

amps rather than MVA. If this box is not checked, limits for both transmission lines and transformers<br />

are expressed in MVA.<br />

For reference, note that the amp rating of a line is derived from the MVA rating using the formula<br />

915

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