Simulator 16 User Guide - PowerWorld

the QV Curve Tool will analyze will then come from two groups: those that the user has pre-selected,
and those that the tool automatically identified because they are among the lowest-voltage buses or
have the highest VQ sensitivities. Whether or not to include the lowest-voltage buses or highest VQ
sensitivity buses are options that need to be set by the user. Pre-selected buses for the QV analysis
must also be set by the user. All of these options need to be specified in the QV options file that is
required to be specified in order to automatically launch the QV analysis.
The remainder of the options that must be specified in order to perform the QV analysis automatically
are described below:
QV options file
Specify the name of the file that contains settings for a variety of options associated with the QV
study in this text box. Use the Browse button to locate this file using a file dialog. The QV options
file should specify which buses should be selected for which to draw QV curves.
Among the topics that may be addressed by the QV options file is whether buses should be
automatically selected as buses for which to draw QV curves based on their voltage or VQ
sensitivity. The easiest way to build a QV options file is to use the QV Curve Tool to specify the
settings of the various options and to save these settings in a file.
How should scenarios be handled?
QV curves can be drawn for the selected buses either for all the scenarios that the PV tool has
processed (select Consider all scenarios in the current list) or just for the scenarios that the PV
Curve tool determined to be critical (select Consider just the unsolved scenarios).
The transfer level at which a scenario is studied with the QV curve tool is based on other options
that can be set with the PV tool. If choosing to archive states, and at a minimum archiving the
critical scenarios, as set on the Output tab, critical scenarios will be studied at the last transfer level
at which each scenario was successfully solved. Another condition is that the states must be saved
as PowerWorld auxiliary (*.aux) files.
If not choosing to archive critical states, the critical state auxiliary file does not exist, or studying
non-critical scenarios, the transfer level at which a scenario is studied in the QV curve tool is the last
transfer level that the PV tool attempted to model. This transfer level is the level that is in place in
the state that the case is left in upon completion of the PV analysis.
QV accelerator settings
This group of controls allows the definition of a voltage window over which each QV curve should be
calculated.
Do not use shortcuts; trace the entire QV curve
Each QV curve will be computed over the voltage range specified for the bus in the QV options
file. This voltage range may be specific to that bus or may be a window what has been defined
for the entire run.
Trace abbreviated QV curves using these settings...
The voltage range over which each bus's QV curve will be computed will be customized according
to the values specified for Max voltage increase and Max voltage decrease. For example, if
a bus is currently at 0.9 pu voltage for a particular scenario and the max voltage increase is
specified to be 0.1 with the max voltage decrease specified to be 0.3, the QV curve for that bus
for that scenario will be traced over the voltage range 0.6 pu to 1.0 pu.
©2011 PowerWorld Corporation
1207