See Also
The Transaction Dialog can be used to modify or create Base Interchange Transactions between two areas. This dialog can be opened by right-clicking in the Base Interchange table of the Area Information Dialog and choosing Show Dialog to see an existing transaction definition, or Insert to add a new transaction.
The transaction dialog is divided into two pages of controls:
Information
This is the "from" area for the transaction. For an export from this area, the transaction value will be positive. For an import into the Exporting Area, the transaction value specified would be negative. Flow out (export) of the exporting area is always considered positive.
Transaction To Area
This is the "to" area for the transaction.
Transaction ID
New in Simulator version 10 is the ability to have multiple transactions defined between the same two areas. Because of this, it is now required that transactions also have a Transaction ID.
Rename Transaction ID
If you wish to change the transaction ID for a particular transaction, enter the new value in the Transaction ID field, and press this button.
Switch Directions
Press this button if you wish to reverse the defined Exporter and Importer for the transaction.
Transaction MW Amount
The MW amount of the transaction being defined. This value should be positive for an export from the Exporting area to the Importing area. The value can also be entered as negative to define a transaction into the Exporting area from the Importing area.
Transaction Minimum MW
The minimum transaction amount between the two areas. This field is only enabled if the check box labeled Transaction Dispatchable in OPF is checked.
Transaction Maximum MW
The maximum transaction amount between the two areas. This field is only enabled if the check box labeled Transaction Dispatchable in OPF is checked.
Exports/Imports Transmission Charge
The cost to transfer power, in $/MWh. This adds an economic penalty for making the transfer, making the transfer less likely to take place. Half the charge is assigned to the buyer and half to the seller.
Transaction Enabled
Transaction can now be defined and either enabled or disabled. Any disabled transactions will be ignored in both a standard power flow solution and an OPF solution.
Transaction Dispatchable in OPF
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.
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.