Simulator 16 User Guide - PowerWorld

In versions of Simulator prior to version 14, these values were always calculated based on the
present voltage at a bus and other branch parameters each time they were displayed. This means
that a user could change the bus voltage, or impedance, and see a corresponding change in the line
flow values. These values are no longer calculated each time that they are displayed. They are
updated following a power flow solution, loading in a case, following an update to the system due to
OPF control changes, and after creating an equivalent. The exception to this is that when loading in
a PowerWorld Binary (*.pwb) file and the flows are stored in the file, the stored flows will be
retained instead of updating them based on the present system state. The MW and Mvar values can
be set to user-specified values using an auxiliary file or pasting from Excel. This will allow the
contouring of flows based on some external source.
Four additional fields have been added that will update each time they are displayed. This means
that they will be updated following a voltage change for a bus or other relevant parameter (i.e.
impedance) change for a branch. These fields take on the functionality of the flow fields prior to
version 14 and are calculated each time that they are displayed. These fields are MW From
(Calculated), MW To (Calculated), Mvar From (Calculated), and Mvar To (Calculated). These fields
cannot be changed by the user.
Lim MVA, % of MVA Limit (Max) (State display default)
The current MVA limit of the branch, and the amount of the actual flow as a percentage of the MVA
limit.
MW Loss, Mvar Loss (State display default)
Real and reactive power losses on the transmission line or transformer. Since reactive power losses
include the effect of line charging, the reactive power losses may be negative.
R, X, B (Input display default)
Indicates the branch’s resistance, reactance, line charging susceptance in per unit on the system
base.
Lim A MVA, Lim B MVA, Lim C MVA (Input display default)
Identifies the first three limit settings. Five additional limits can be set, for which the columns can be
added using the Display/Column options from the local popup menu. All limits are expressed in MVA.
See Transformer Display for viewing transformer specific fields.
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