Simulator 16 User Guide - PowerWorld

Load Display
The Load Display presents data describing each load in the case. The Load 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 case information toolbar from which you can print, copy, and modify its information
as well as view the information dialog of its associated loads. The toolbar also affords the opportunity
to insert new loads into the model or to delete existing ones. Moreover, it enables you to invoke the
Quick Power Flow List and Bus View Display for the load’s terminal bus. You can also sort the load
information by clicking on the heading of the field by which you want to sort. Additionally, you can
choose to restrict the information shown by the Load Display according to the constraints of the
area/zone/owner filters.
To show the load display, select Network > Loads in the Model Explorer.
The load display contains the following fields by default:
Number, Name
ID
Number and name of bus to which the load is attached.
Two-character ID used to distinguish multiple loads at the same bus; ‘1’ by default.
Status
Either Closed if the load is connect to its bus, or Open if it is not. You can click on this field to toggle
its value. If the load is open, the entire load record is dimmed.
MW, Mvar, MVA
Total real, reactive, and complex power for the load. Loads may be voltage dependent. The total
load is the sum of the constant power, constant current, and constant impedance components. See
Load Information and Load Modeling for more information.
S MW, S MVAR, I MW, I MVR, Z MW, Z MVR
These six fields describe the composition of the load at the bus assuming 1 pu bus voltage. The
SMW and SMVAR fields indicate the constant power portion of the load, the component that does
not vary with bus voltage magnitude. The IMW and IMVR fields express the constant current part of
the load, which varies in proportion to the bus voltage magnitude. Finally, ZMW and ZMVR indicate
the constant impedance portion of the load, which varies with the square of the voltage. The sum of
the SMW, IMW, and ZMW fields yields the base MW load at the bus (assuming 1 pu voltage), and
the sum of the SMVR, IMVR, and ZMVR fields provides the base MVR load at the bus (assuming 1 pu
voltage). Please see Load Modeling for more details on how bus load is modeled.
©2011 PowerWorld Corporation
243