Load Benefit Models Display

See Also

 

The Load Benefit Models Display presents detailed cost information for each load in the case set to use a piecewise linear benefit model. The Load Benefit Models Display is a class of Case Information Display and therefore can be used in a manner consistent with all other case information displays. It has a local menu from which you can print, copy, and modify its records as well as view the information dialog of its associated loads. The Quick Power Flow List and Bus View Display tools are available for finding more information on the load’s terminal bus. You can also sort the load records by clicking on the heading of the field by which you want to sort. Additionally, you can choose to restrict the records shown by the Load Benefit Models Display according to the constraints of the area/zone/owner filters. Finally, you can use the local menu’s Insert and Delete options when the application is in Edit Mode to insert a new load into the case or to delete an existing load.

To show the generator piecewise linear cost display, select Network > Loads > Benefit Curves Linear in the Model Explorer.

 

By default, the generator records display contains the following fields:

Number, Name

Number and name of bus to which the load is attached.

Area Name of Gen

Name of the area to which the load belongs. The load can belong to an area which is different than the area of which its terminal bus is a member.

ID

Alphanumeric ID used to distinguish multiple generators at the same bus; ‘1’ by default.

Status

The Open / Closed status of the load. This is a toggleable field.

AGC

Designates whether the generator’s real power output is governed by automatic generation control, since effectively dispatching a load can be viewed as dispatching negative generation. If the AGC field is set to Yes, the load is on automatic generation control (AGC). When a load is on AGC, its real power output can be varied automatically. Usually the purpose for AGC is to keep the area interchange at a desired value. You can click on this field to toggle its value (except in Viewer). Please see Area Control for more details.

Gen MW

Current real power demand of the load.

Min MW

Minimum MW demand of the load.

Max MW

Maximum MW demand of the load.

Fixed Benefit

The fixed benefit of the load.

Benefit Model

The type of model this load is currently using. Can be either Piecewise Linear or None.

MWh Break x, MWh Price x

The remainder of the display is populated with MWh Break and MWh Price pairs. These pairs define the break points of the piecewise linear curve. The MWh Break value is a MW demand value of the load. The MWh Price value is the corresponding marginal benefit of extracting an additional MW of load at that MW output level. Therefore entering the break points of the piecewise linear curve in this manner defines the slopes of the next section of the curve, starting at the current MW Break point and up to but not including the next defined break point. The last MWh Break and MWh Price pair defined will define the marginal benefit of the load from that break point location to the maximum demand of the load.

A requirement of the piecewise linear benefit curve is that it must be concave, meaning the next MWh Price must be lower than the previous MWh Price. In other words, as more load is supplied, the less the benefit it is providing. This is how a load can be dispatched along with generation, according to marginal costs (and marginal benefits.)

These fields will be disabled unless the Cost Model type is set to Piecewise Linear.