Simulator 16 User Guide - PowerWorld

TLR Sensitivities
Specify if the next set of calculated TLR sensitivities should replace the currently calculated values,
or be appended to the current values. The normal option is to Clear before Calculate. When
choosing to Append, then as new calculations are performed, the results will only replace the
existing sensitivity value store if the new value is larger than the old value. (Note: in this situation,
negative values are considered smaller than positive values).
PTDF Calculation Method
Choose the solution method to use for calculating the sensitivities similar as done on the PTDF
Dialog.
Note: The Lossless DC methods will be affected by the DC Power Flow Model settings in Power
Flow Solution: DC Options. Click on the DC Model Options button to open the dialog which sets
these options.
Calculate TLR Sensitivities
Click the button to calculate the sensitivities. The calculation processing through each bus and
determines the sensitivity of the MW flow of selected device with respect to a change of real power
at each bus. When the transactor type is buyer, then the assumption is that power is injected at
each bus and absorbed at the transactor object. When the transactor type is seller, then the
assumption is that power is injected at each transactor object and absorbed at each bus.
DC Model Options
Click this button to open the DC Options page. Here you can adjust the DC options you want used if
you are computing the PTDFs with a Lossless DC approximation.
Include only AGCAble Generators
If checked, then only generators available for automatic generation control will be included in the
TLR sensitivity calculations.
Set Sensitivities At Out-Of-Service Buses Equal to Closest
Click this button to approximate the sensitivities at out-of-service buses with the sensitivity of the
closest bus. Otherwise the out-of-service buses will display sensitivities of 0 when the sensitivities
are calculated.
Line/XFMR or Interface Only: Bus, Generator, Load, Injection Group, and Area
Sensitivities
The Bus Sensitivities show the values calculated at each bus. Generator sensitivities show the same
information but have only a list of generators with the P Sensitivity column showing the sensitivity
calculated at the terminal bus. The Load sensitivities are similar to the generator sensitivities in that
they show the same information as the bus sensitivities but only show the list of loads with the P
Sensitivity column giving the sensitivity calculated at the terminal bus. The Injection Group
sensitivities represent averages of the bus sensitivities weighted by the participation factors of each
generator, load, or switched shunt in the group. All participation factors are included in this
calculation regardless of the AGC status of any included generators. The Area Sensitivities calculated
represent a weighted average of the generator buses in the area with the weighting done by
generator participation factor.
If using the Integrated Topology Processing add-on, an Only show the primary bus for each
superbus checkbox will be available on the Buses tab. Checking this box will limit the buses shown
on that tab and the list of Bus transactors to only those that are primary buses. This provides a
quick means of removing the clutter of redundant data. The primary buses and superbuses are
determined from the base case topology.
Multiple Elements Only: Multiple Bus, Generators, Loads, and Injection Group Sensitivities
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