Generator Reactive Power Capability Curve

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The reactive power output of most generators depends on the real power output of the generator. This dependence is expressed using a reactive capability curve. Simulator models the reactive capability curve using a piecewise linear approximation. The reactive capability curve is modified on the generator dialog and can be saved/loaded using the Generator Reactive Capability Curve Auxiliary files.

 

Modeling a Reactive Power Capability Curve From the Generator Dialog

• Make sure the Use Capability Curve checkbox is checked.
• In the table at the bottom of the dialog, prescribe the reactive capability curve using up to 50 points. The points should be ordered by MW, in numerically increasing order. At each point specify the MW value, the minimum reactive power value in Mvar, and the maximum reactive power value in Mvar. The first point should correspond to the minimum MW output of the generator while the last point should correspond to the maximum MW output although there is not a strict requirement that the generator's minimum and maximum output be specified in the curve. If the MW output of the generator is less than the MW value of the first point specified for the curve, the first curve point will be used to determine the minimum and maximum Mvar. If the MW output of the generator is greater than the MW value of the last point specified for the curve, the last curve point will be used to determine the minimum and maximum Mvar.
• To insert a new point, click on the desired column, and then right-click to display the table's local menu. Select Insert Point.
• To remove a point, click on the desired column, and then right-click to display the table's local menu. Select Delete Point.
• When finished be sure to select Save to save your modifications.

In the Run Mode, you can view the reactive power capability curve graphically by right-clicking on the generator to display its submenu and then selecting Reactive Capability Curve.