Simulator 16 User Guide - PowerWorld

Checking this box enables the transfer to be dispatched by the OPF algorithm. Dispatching the
transaction makes the two areas of the transaction appear to be one area for the purpose of
economically dispatching the generation in the two areas. The transaction can have a maximum and
minimum transfer amount when dispatchable, and a transmission charge associated with the
transaction.
Determine Price in OPF
Checking this box allows the OPF algorithm to determine the cost associated with the transfer. The
cost is determined by the marginal cost of enforcing the power balance constraint for the combined
areas. This is the typical way to implement a transfer if both areas are on OPF control. If only one of
the two areas are on OPF control, then the area which is off of OPF control needs to specify a price
for the transfer. This is done by explicitly defining a piecewise linear cost curve.
Piecewise Linear Transaction Cost Curve
These two curves are only enabled if the option Transaction is Dispatchable in OPF is checked
and the option Determine Price in OPF is unchecked. These two curves can be defined for the
purpose of assigning a price to the transfer of power between one area on OPF control and another
area which is not on OPF control. Separate curves can be defined for export transactions (from the
Exporter to the Importer) and import transactions. To add points to the curves, simply right-click in
the grid and choose Insert from the local menu. Enter the MW value and corresponding marginal
cost for the inserted breakpoint of the piecewise linear curve you are defining. To delete a point,
right-click on that row in the grid and choose Delete from the local menu.
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Custom
The Custom page of the Transaction dialog is simply a location to log information about the
transaction in the Memo box, and to see the values (if any) stored in some of the custom fields for the
transaction. To log information about the transaction, simply switch to the Custom page on the dialog,
and start typing your information or comments about the transaction in the page, or enter custom
values in one of the custom fields.
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